Search for pov in Topics


I am looking for information and help to build a POV display that projects the statement: "No light beer." Anyone out there that can help me? I've looked at and followed the postings over time, but have no way of knowing where to start. Thanking one and all in advance. :)

Topic by peaceman    |  last reply

RGB POV Answered

Hello  friends! Im  make RGB pov using Arduino,   How to control 6 RGB Led  using  3 transistors?  please helpme  arduino code

Question by AzamA9    |  last reply


Hello  friends! Im  make RGB pov using Arduino,    How to control 6 RGB Led  using  3 transistors?  please helpme  arduino code

Topic by AzamA9  

My POV Toy!

Woot!I finally finished my version of ladyada's miniPOV.I just made it a bit smaller and used a header for programming rather than attaching the 25 pin D connector directly to the board. Oh - and almost all of my supplies (except for the board) were free =DD.-->Check it!-T3h_Muff

Topic by T3h_Muffinator    |  last reply

Pov display with arduino

I was making pov display with 10 leds using arduinobut it seems it is not working as it shouldhere is the code would appreciate an kind of help

Topic by DabuHackker  

Knife POV wants to kill

Flickr user zeni666 has created a lovely knife POV. Wave it around and the 7 LEDs spell out "KILL" in the air.   zeni666's Flickr page via Make

Topic by fungus amungus    |  last reply

How to make POV with Arduino??

So I'm getting so sick of all these nice projects with POV. They tell you how to make the circuit and then put in some code and tell you to upload it. I want to why it works, how it works, and an explanation of the Arduino sketch. Can anybody show me somewhere where they totally explain how to to POV with Arduino???? Thanks!

Topic by HavocRC    |  last reply

can i make a magnetic POV? Answered

I made a small scetch (in under 1minute) of what i mean, its really raw, just to get the idea. my idea is to make a small box, with a moving POV in it, wich moves only from the left to the right, and back. this uses a small POV system, 2 elektromagnets, some way to make the leds go in the right direction, some iron/steel, and something to controll the magnets. i wanted to know, is this possible, and if so, what magnets, controlling device do i need and how do i make the leds go in the right direction. i've considered the tracks from a CD player, but i think theres a cheaper/better way to acieve this... if i get enough info to make one, il make a full instructable of it :)

Question by godofal    |  last reply

POV using LED matrix

Hi, I am doing a project of making and LED analog clock. The clock contains almost 300 LEDss and they are arranged in a specific pattern that looks like and analog clock. My question is how would you create a POV in this design of the clock. I have checked other projects of POV; in those projects the whole device moves along with the row of LEDs and then it created a POV effect. However, in my project, the LEDs are fixed on a plastic sheet. How would I create a POV effect on that??? Please HELP!!!

Topic by Bam Boy    |  last reply

Has anyone done anything cool as far as modding or reprogramming the Monkeylectric POV?

Has anyone tried or figured out how to make the $60 POV into their $2k POV, reprogramming or any other really cool hacks? I really want one of their video units but not enough to fork out that much money. Aren't they basically the same with the exception of the controller and the pre progammed images?

Question by gdog8511    |  last reply

Anyone seen this POV? looks simple but for the life of me i cant work it out !? Answered


Question by ohthatshowitworks    |  last reply

can you put a programmable led pov on a yo-yo? Answered

Hi, i am wondering if you can put a led pov on a yo-yo that you could some how program to make patterns, or something like this:    Thanks in advance.

Question by salomon1996    |  last reply

Perisistence Of Vision As A Replacement of Display Boards

Hello Guyz, Yesterday at night an idea got struck at my mind that can pov be used as a replacement for the huge display boards which are put on the large cities like NY,Las Vegas etc.  There will be a huge amount of energy conserved if we apply this principle.

Topic by abhirooprobotics    |  last reply

Wiring stripboard tracks to common ground

I'm planning a stripboard POV kit to solder with learners over about 3 hours or so, and I have a problem designing the wiring for the LEDs. It's straightforward to use the required series resistors to wire the output pins of an ATMEGA like to the anodes of 8 5mmx2mm rectangular leds like packed side by side onto 0.1 inch stripboard. However, I'm facing a puzzle when trying to wire the LEDs' cathodes together to ground. It's fairly easy for me myself to do this, just by free-soldering a couple of spare legs directly over the cathode tracks, or chaining loads of wires. However, I can't see myself guiding 45 people through this in a workshop without hassle and errors. Does anyone have a simple way to wire 8 'odd' stripboard tracks together to a ground track (the 'even' tracks have the anodes in them). To give a flavour of the solutions I'm considering, I'm looking into 0Ohm bussed resistor networks like to wire theparallel tracks into a single ground track using a standard through-hole component with legs clipped off. However I'm having trouble sourcing anything like this, and I'm sure others have better ideas.

Topic by cefn  

I've been thinking of making a POV led display using an arduino uno. can anybody help? any tutorials will help. thanks

I am very new the arduino programming environment and any basic tutorials that are relevant will help. 

Question by j.witherstone    |  last reply

Programming Atmega8 using arduino troubleshooting?

I am making a POV (persistance of vision) project using atmega8 ,which is being programmed by arduino (uno) as ISP i am following this  tutorial videos and blink led code is working well    for me as in the video, I tired the same code by changing the delay for verifying whether the circuit works properly   and i was working nice But i uploaded my persistance of vision code(POV) its no working  none of the leds is blinking I using the correct pin i verified it with arduino uno atmega8 pin mapping Here is my Persistance of vision code int _[] = {0,0,0,0,0, 0,0,0,0,0, 0,0,0,0,0}; int A[] = {0,1,1,1,1, 1,0,1,0,0, 0,1,1,1,1}; int B[] = {1,1,1,1,1, 1,0,1,0,1, 0,1,0,1,0}; int C[] = {0,1,1,1,0, 1,0,0,0,1, 1,0,0,0,1}; int D[] = {1,1,1,1,1, 1,0,0,0,1, 0,1,1,1,0}; int E[] = {1,1,1,1,1, 1,0,1,0,1, 1,0,1,0,1}; int F[] = {1,1,1,1,1, 1,0,1,0,0, 1,0,1,0,0}; int G[] = {0,1,1,1,0, 1,0,1,0,1, 0,0,1,1,0}; int H[] = {1,1,1,1,1, 0,0,1,0,0, 1,1,1,1,1}; int I[] = {0,0,0,0,1, 1,0,1,1,1, 0,0,0,0,1}; int J[] = {1,0,0,0,0, 1,0,0,0,1, 1,1,1,1,1}; int K[] = {1,1,1,1,1, 0,0,1,0,0, 0,1,0,1,1}; int L[] = {1,1,1,1,1, 0,0,0,0,1, 0,0,0,0,1}; int M[] = {1,1,1,1,1, 0,1,1,0,0, 0,1,1,1,1}; int N[] = {1,1,1,1,1, 1,0,0,0,0, 0,1,1,1,1}; int O[] = {0,1,1,1,0, 1,0,0,0,1, 0,1,1,1,0}; int P[] = {1,1,1,1,1, 1,0,1,0,0, 0,1,0,0,0}; int Q[] = {0,1,1,1,1, 1,0,0,1,1, 0,1,1,1,1}; int R[] = {1,1,1,1,1, 1,0,1,0,0, 0,1,0,1,1}; int S[] = {0,1,0,0,1, 1,0,1,0,1, 1,0,0,1,0}; int T[] = {1,0,0,0,0, 1,1,1,1,1, 1,0,0,0,0}; int U[] = {1,1,1,1,1, 0,0,0,0,1, 1,1,1,1,1}; int V[] = {1,1,1,1,0, 0,0,0,0,1, 1,1,1,1,0}; int W[] = {1,1,1,1,0, 0,0,1,1,0, 1,1,1,1,0}; int X[] = {1,1,0,1,1, 0,0,1,0,0, 1,1,0,1,1}; int Y[] = {1,1,0,0,0, 0,0,1,0,0, 1,1,1,1,1}; int Z[] = {1,0,0,1,1, 1,0,1,0,1, 1,1,0,0,1}; int letterSpace; int dotTime; void setup() {   // setting the ports of the leds to OUTPUT   pinMode(9, OUTPUT);   pinMode(10, OUTPUT);   pinMode(11, OUTPUT);   pinMode(12, OUTPUT);   pinMode(13, OUTPUT);   // defining the space between the letters (ms)   letterSpace = 6;   // defining the time dots appear (ms)   dotTime = 3; } void printLetter(int letter[]) {   int y;   // printing the first y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y]);   }   delay(dotTime);   // printing the second y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y+5]);   }   delay(dotTime);   // printing the third y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y+10]);   }   delay(dotTime);   // printing the sspace between the letters   for (y=0; y<5; y++)   {     digitalWrite(y+2, 0);   }   delay(letterSpace); } void loop() {   // you can print your own text by modifing here :) printLetter(H); printLetter(E); printLetter(L); printLetter(L); printLetter(O); printLetter(_);   }

Question by Mayoogh_Girish    |  last reply

what is this sensor?

I found a blink pov from here (layne and wayne) they are prframming the pov using Ambient light sensor ( physically looks like Led) what is this ambient light sensor?? is the same as IR leds ??? can i replace it with any other thing??? because the ambient light sensor is not available in the market

Question by agent555  

Programming Atmega8 using arduino troubleshooting

I am making a POV (persistance of vision) project using atmega8 ,which is being programmed by arduino (uno) as ISP i am following this tutorial videos and blink led code is working well   for me as in the video, I tired the same code by changing the delay for verifying whether the circuit works properly  and i was working nice But i uploaded my persistance of vision code(POV) its no working   none of the leds is blinking I using the correct pin i verified it with arduino uno atmega8 pin mapping Here is my Persistance of vision code int _[] = {0,0,0,0,0, 0,0,0,0,0, 0,0,0,0,0}; int A[] = {0,1,1,1,1, 1,0,1,0,0, 0,1,1,1,1}; int B[] = {1,1,1,1,1, 1,0,1,0,1, 0,1,0,1,0}; int C[] = {0,1,1,1,0, 1,0,0,0,1, 1,0,0,0,1}; int D[] = {1,1,1,1,1, 1,0,0,0,1, 0,1,1,1,0}; int E[] = {1,1,1,1,1, 1,0,1,0,1, 1,0,1,0,1}; int F[] = {1,1,1,1,1, 1,0,1,0,0, 1,0,1,0,0}; int G[] = {0,1,1,1,0, 1,0,1,0,1, 0,0,1,1,0}; int H[] = {1,1,1,1,1, 0,0,1,0,0, 1,1,1,1,1}; int I[] = {0,0,0,0,1, 1,0,1,1,1, 0,0,0,0,1}; int J[] = {1,0,0,0,0, 1,0,0,0,1, 1,1,1,1,1}; int K[] = {1,1,1,1,1, 0,0,1,0,0, 0,1,0,1,1}; int L[] = {1,1,1,1,1, 0,0,0,0,1, 0,0,0,0,1}; int M[] = {1,1,1,1,1, 0,1,1,0,0, 0,1,1,1,1}; int N[] = {1,1,1,1,1, 1,0,0,0,0, 0,1,1,1,1}; int O[] = {0,1,1,1,0, 1,0,0,0,1, 0,1,1,1,0}; int P[] = {1,1,1,1,1, 1,0,1,0,0, 0,1,0,0,0}; int Q[] = {0,1,1,1,1, 1,0,0,1,1, 0,1,1,1,1}; int R[] = {1,1,1,1,1, 1,0,1,0,0, 0,1,0,1,1}; int S[] = {0,1,0,0,1, 1,0,1,0,1, 1,0,0,1,0}; int T[] = {1,0,0,0,0, 1,1,1,1,1, 1,0,0,0,0}; int U[] = {1,1,1,1,1, 0,0,0,0,1, 1,1,1,1,1}; int V[] = {1,1,1,1,0, 0,0,0,0,1, 1,1,1,1,0}; int W[] = {1,1,1,1,0, 0,0,1,1,0, 1,1,1,1,0}; int X[] = {1,1,0,1,1, 0,0,1,0,0, 1,1,0,1,1}; int Y[] = {1,1,0,0,0, 0,0,1,0,0, 1,1,1,1,1}; int Z[] = {1,0,0,1,1, 1,0,1,0,1, 1,1,0,0,1}; int letterSpace; int dotTime; void setup() {   // setting the ports of the leds to OUTPUT   pinMode(2, OUTPUT);   pinMode(3, OUTPUT);   pinMode(4, OUTPUT);   pinMode(5, OUTPUT);   pinMode(6, OUTPUT);   // defining the space between the letters (ms)   letterSpace = 6;   // defining the time dots appear (ms)   dotTime = 3; } void printLetter(int letter[]) {   int y;   // printing the first y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y]);   }   delay(dotTime);   // printing the second y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y+5]);   }   delay(dotTime);   // printing the third y row of the letter   for (y=0; y<5; y++)   {     digitalWrite(y+2, letter[y+10]);   }   delay(dotTime);   // printing the sspace between the letters   for (y=0; y<5; y++)   {     digitalWrite(y+2, 0);   }   delay(letterSpace); } void loop() {   // you can print your own text by modifing here :) printLetter(H); printLetter(E); printLetter(L); printLetter(L); printLetter(O); printLetter(_);   } Is there any solution ???

Topic by Mayoogh_Girish  

Film maker needs help!

Hey guys, So I'm an experimental a 21 year old film maker. Basically I try to innovate with film and perception which is how I won the Sheridan College Media arts award for experimental film making last year (this is however why I'm expected to make something great this year). My latest notion is in spinning camera's. If a camera is spinning (attached to the end of a drill let say) you get a blur but  because I'm an animator I'm familiar with the persistence of vision. This is a frequent DIYS project (persistence of vision clocks) from what I can tell. I need to create a very simple 5 or 6 led light that, when a camera is spinning in front of it, will display what ever I wish (text, images, ect). So instead of the lights spinning the camera is. Obviously more LED's the more complicated it can be. Now... I don't know where to begin with my questions. Could I pay you to create user friendly software and hardware? Are you willing to help for recognition purposes? Can you only make software? Can you only make hardware? Where do I begin to inquire? I guess this project is for those who are interested in innovation more than anything... I really need a community of friends on this one :(

Topic by mrmadsci    |  last reply

Make a hard drive constantly spin outside a PC case?

 I'm currently working on a POV hard drive clock. Instead of designing and building a separate circuit to drive the motor in the hard drive, I thought I'd just power the circuit board of the hard drive and let that spin the motor itself. I gave it gnd, 5v and 12v and it spun up, fast and stable too. ~30 seconds later, it stopped spinning and the only way to make it spin again was to turn the power off and turn it on again. Obviously this isn't good for a hard drive clock as it needs to be spinning constantly So how can I make the hard drive spin constantly? Can I pulse a request line on the IDE cable every once in a while or do I need to actually transfer data to and from the hard drive? If it isn't too complicated I could program a PIC chip to talk to the hard drive to keep it spinning but I'm not sure about the structure of the data or how to talk to the hard drive. Anyone know the simplest way to keep it spinning? Thanks, Louis.

Question by lofty    |  last reply

LED Matrix & POV PCBs up for grabs!

Boy do I have a deal for you! I've been working on an uber-clock project recently (it's going to be really really awesome!), and it entails a very interesting display -- a 5x16 array of SMD LEDs.I tried making a homemade PCB, but it was impossible to use, so I'm sending my order out to a fabhouse for some real ones. While I'm at it, I'm offering you, instructablonians, the chance of a lifetime: Owning one of these awesome* boards!For $18, you get the PCB and 100 red SMD LED's! (LEDs courtesy of T3hMuffinator) -- this price pretty much covers the cost of the board & shipping.For an extra 5 bucks, I'll stuff the board with the LEDs for you.(The 5 bucks is to cover the solder paste, and the labor involved :P)It definantly needsto be stuffed with solder paste, the parts are very close together. It is litterally just the LED matrix, there are spots for it to be connected to a controller board, where the resistors would lay.EDIT: Heres the schematic, sch file, and the board.EDIT2: New board design, much much more compact! 3.15" x 1.20"! EDIT3: Just in case we get a flood of replies, I'll repeat 'Muff.He's supplying the LEDs. They're avaliable in red, white, yellow, and 1 other color. They're from [ Select Technology] (eBay UMO88)EDIT4: I also have controller boards availible. They're basically an AtMega8, resistors, header pins, power, etc all on a board the same size as the array. (not an easy task!) They're $18, PM me fore more detailsI also have some POV boards availible. They are uber-compact, at only 0.8"x0.6"! They come with 10 SMD LEDs. They cost $5 a piece. Just add the Attiny13 & power!For $15, you get the POV PCB, the LEDs, 11 Male & 5 Female header pins, a DB-25 connector, an Attiny13, and its socket. Its everything you need to use this PCB. (Note: you need a parallel port on the back of your computer in order to use this board to program the uC)Its a very self-explaintory PCB, which makes it great. Its compact size is great for a few different thingsAn instructable is coming really soon on making/stuffing/using it, so don't dispair!---All three boards distributed by Rethinker Industries and liscenced under by-nc-sa.

Topic by zachninme    |  last reply

knex rollercoaster cart with a cam built in

knex have made a new micro knex rollercoaster cart that as a camura built in!!! the cart has a cam on the bottem of the front of the car and comes with a computer lead witch you plug into the bottem of the cart to see a video if your rollercoasters pov( not so sure what pov means bit it is what the front passenger on a rollercoaster sees when riding) on your computer!!! i found all this out from the gadget show on TV. i dont know how much it will cost or when its coming out or if it is only coming in sets ok i have found out this set has been out for a long time in the USA but i live in the UK  and had no idea it was this old.     

Topic by slithien    |  last reply

Cheapest Attiny85?

Hi, I am planing to buy a Attiny85 to make a led pov display. I live in India So can you tell me where I can Find cheapest Attiny85with free delivery in Internet??

Question by Soumojit    |  last reply

Coding to controll a 4x4x4 led cube with arduino duemilanove... Help please?

Okay, i know how to build the cube and to multiplex it to use only 12 pins. what i am going to do is connect each anode of each level and connect each cathode of each row, and each one will go to its own transistor. so i will have a total of 8 transistors for the anodes and 8 transistors for the cathodes, which i can further multiplex into two groups of 4x2 transistors. that makes a total of 12 pins on the arduino(i hope that makes sense ill add pics of what i mean to help) but what im asking is that i need help on writing the code for this project. i have a basic idea to run loops inside of loops to make more than one led look like theyre on at the same time(i believe its called persistance of vision)  but maybe someone more experienced would be able to help me out with this. thank you to anyone helps and A Happy New Year To All Of You!!!

Question by the seaker    |  last reply

Need help on identifying big BLDC motor from 5.25 HDD (hallsensors?)

Hi! I have a very nice 5.25 HDD spindle motor with (obviosly) built-in hallsensors (or probably other kind of sensors?). I tried already to find a datasheet, but no success. The 3 spindle coil connectors are easy to identify, but I have real trouble to find out how to connect the hall sensors that are built in. I tried already to put 5 V DC from my arduino to the red/black connectors, then measured several combinations on the remaining 6 connectors which I believe are the hall-sensors. But the signals coming back is not 0 or 5V like a hallsensor should do. I measure slight voltages going up and down when turning the spindle by hand, for some combinations the current is alternating between -200 mV and +200mV. It looks more like a sinuswave for me, but not from the spindle coils. It delivers only a signal when I connect 5V to the red/black connectors. Unfortunately I can't open the spindle, dont want do damage it. The original driving circuit is missing, only housing, platters and spindle is left. Can anybody help to identify or how to find out about the sensors (6 pins + 1 black + 1 red). I also added 10k pull-up resistors, but no on/off effect when turning the spindle. The HDD is a FUJITSU M2266SA, the spindle is manufactured by Matsushita but google does not return anything useful on the part number(s) DIL-58B 3  or  B90L-1415-0021A.  Any help to get this baby running is highly appreciated!

Question by pocketom    |  last reply

Arduino Help

I have found a lot of cool codes online such as pov and piezo element projects, but I have no idea how to put the code into the environment! Any help? (I mean like can I copy and paste it or something?)

Topic by fallenspirit123  

rgb led

Red green blue common cathode light emitting diodes anybody know any cool projects with them? The best ones I found were the hypno cubes and pov's, and some displays were cool. any others? I want to know before I buy a bunch of leds to save on shipping.

Topic by guyfrom7up    |  last reply

LPD-6803 Pixel RGB led module (suitable for pov...) help

(cross posting from;=15768) Apart from the "dream/magic color" led strips featured in projects like ... -Headband/ there are some other IC varieties of pixel RGB leds which have 32 controllable shades per channel which I am currently looking for programming information on. In particular there is this pixel module which I believe uses a LPD-6803 chip and compatible controller I am interested in testing: ... etter.html ... oller.html Many other varieties of LPD-6803 based "pixel rgb led" modules can be found. The LPD-6803 appears suitable for video and perhaps better for the POV strip application I have in mind. The only sources of information on the web I have found on this chip so far are: ... =firefox-a (translated from German) ... PD6803.pdf (in Chinese) and some documents I have not yet registered to see on This would be my ideal platform to program for on Arduino, so any comments or advice on how plausible this chip looks to control would be gladly appreciated!

Topic by islisis    |  last reply

Where is a rainbow? Answered

As you may be aware, your reflection in a mirror appears to be behind the mirror. But, where is a rainbow? The Sun is over your shoulder, the cloud of raindrops is in front of you, but what is the apparent location of the rainbow? Is it between the observer and the water droplets, in the same location as the water droplets, or behind the water droplets (from the POV of the observer)? Or is it at some indefinably infinite location? I should know this... (a sketched-out ray diagram would be greatly appreciated)

Question by Kiteman    |  last reply

How do you put a cellphone on a knex roller coaster? Answered

On youtube people did a lot of POVs for their knex roller coaster. I want to do one too. I don't have a mini camera or that set that comes with a small camera in it. So I want to put my cellphone onto it. My question is how to do it w/o using tape, glue, other materials, or modding the car?. Thanks.

Question by Pizzapie500    |  last reply

Windows Phone 7 "I Need This App" contest

Some of you probably already know this, but Windows Phone is having an app contest where you post an idea for an app and if you win they give you $5K and dev your app for you. These are some that I thought were cool. Post 'em if you got 'em :D BTW, you can vote anonymously. phone as POV display: level up your ingame characters from your phone: phone as 360 controller:

Topic by Aercimete  

Three Mystery Subscribers

Hello K'nexers, just wanted tell you about 3 new subscribers and basically I got a new one on the 18th and 25th January and then on the 1st February which were all Sundays so basically I was getting a new subscriber every Sunday for three weeks and then it just stop although I still do get them which is good a thing. From my POV it felt like a winning streak or it was just down to luck but I'm not quite sure myself since it was just very weird thing to happen. Would be interested to hear you thoughts and opinions.

Topic by Zombiekiller-93  

Help with code on 4 x 4 x4 LED cube with Arduino?

Recently i made a LED cube, on my own, and  i want it to display characters, alphabets numbers going layer by layer using the concept of multiplexing and POV (persistence of vision) , i googled a lot, searched on instructables too!! but was unable to find an easy code to do what i want, i am only a begginer and don't have very much knowledge . Please provide a way i can go for. By the way this is what i did a day ago:-

Question by jatinbatra    |  last reply

What would make a good cushion for a bike mounted video camera to minimize the vibration?

By cushion I mean like a gel bag or something. See this video to give you an idea of what I'm talking about. It appears that this clip was shot by the mounted camera which can be seen, but it actually was shot by holding the camera on a monopod in one hand as I rode. The mounted footage was way to jittery. The mount that is there on the crossbar needs to be cushioned somehow to at least make it as good as what you see, but not some big Steadycam contraption. The obvious answer is a good POV cam but the good HD ones are serious money. I appreciate any head scratching on this one.

Question by dayjack119    |  last reply

Top 10 LED Instructables

LEDs are an incredibly useful and versatile source of light. Use just one of them to make a simple indicator, or wire up a whole bunch and you can create a bona fide high power light source. There are tons of applications for LEDs, and there is certainly no shortage of ideas, projects and helpful feedback at instructables. To help make sense of it all, I thought I would try to pick out 10 of my favorite LED instructables that are great for the LED beginner and the expert alike. This list isn't hierarchical - I like all 10 projects. Instead, it's loosely arranged in ascending level of complexity, so newcomers to LEDs might want to start at the beginning and work their way up (or down as the case may be).Drum roll please...1. LEDs for beginners is a first time guide for anyone looking to learn a little bit about how to wire up one or more LEDs.2. How to solder is a guide that explains how to solder wires, electrical components and more and assumes no prior soldering knowledge. If you're going to work with LEDs, chances are you'll need to do some soldering, so this could be a useful place to learn some skills.3. LED Throwies is a super popular and simple instructable that shows you how to take a magnet, a battery, some tape and an LED, and make a cool light that will stick to anything magnetic.4. Fridge Lights is an instructable that shows you how to turn your refrigerator into a canvas for LED art. It has a little more involved in it than LED Throwies because you have to prepare your refrigerator surface a bit, but its still a great project to get started on working with LEDs. 5. LED Football is a simple project that embeds LEDs in a Nerf football so that you can see it in the dark. The football emerges from the process relatively unharmed, and from the pictures it looks a lot like a cool flying saucer.6. LED Bikelight V2 and How to build a 1,024,000 mcd portable light take multiple LEDs and wire them together to make high power bicycle lights. There are many bike lights on the site besides these two that are also great, but I like these two because they are really BRIGHT. 7. Blue LED Light Box is a bedroom light that helps combat Seasonal Affect Disorder (SAD) and the winter blues by letting you bask in 18 watts of LED power. If you like the first iteration of this project check out the Blue LED dawn simulator for Soleil Sun Alarm add on that controls the brightness of the LEDs according to a dawn simulator alarm clock.8. Spoke POV: LED Bike Wheel Images is an instructable that puts LEDs in motion and creates persistence of vision (POV) images of your choice right on your bike wheels as you're riding. If you have never seen POV images before you should definitely check this out as there are a bunch more POV instructables on the site. It's a public mobile display for your bike!9. Watch futurama on an 8x8 pixel screen shows you how to make an LED display that you can use to "watch" tv on. While the actual display doesn't have enough pixels to actually create a recognizable image, I like this instructable because even though I work with technology, I think I secretly want to live like a caveman, and it's this kind of forward thinking backwards technology that gets me going.10. Microdot - wrist watch LED pattern timepiece is an instructable that shows you how to build a unique LED watch. It's one of the more advanced LED projects on the site, but rgbphil offers good support in the comments section and should you decide to build it ever you'll end up with one heck of a watch.Instructables HQ is going to be mailing stickers to the authors of the projects on this list as a mini prize for making great things with LEDs. Anyone else who makes a list of their favorite instructables and posts about it on the forums gets stickers too!

Topic by noahw    |  last reply

(newsletter) Homemade Shampoo, Cryptex, RumbleMouse...

Sign-up for this newsletter: Welcome back! NEW Pocket-Sized Contest - Think small, and win a custom laser-etched Leatherman! Get in the Garden Contest - Enter any Instructable with a gardening theme and win an awesome computer-controlled indoor composting machine from NatureMill! Art of Sound Contest - Share any sound or music-related Instructable, and win an incredible custom hi-fi tower set with subwoofer, monster speakers, and more!! Get the LED Out! Contest - Closed for entries, but open for voting! Vote Now! RGBike POV - Open Project Make Your Own Seed Tapes Homemade Shampoo Double Helix DNA Model with LEDs Simple Sequencer Make an Onigiri (Rice Ball) Adjustable Modular Furniture Non-Slip iPod/phone Stand New contest! Get Started with Arduino Build an Alien Artifact DIY Audio Switch How to Cook with Herbs and Spices Win a cool computer-controlled indoor composter! Win these custom hi-fi speakers! Cryptex Design Audio for an iPhone Game Replace Low Voltage Halogens with LEDs RumbleMouse Sign-up for this newsletter:

Topic by fungus amungus  

Is your local shop ripping you-off?

I was vaguely interested in wholesale prices for shop products, and managed to find this price-list. The wholesale price is WSP, RSP I guess is the Recommended Sale Price (I think there must be tax in there somewhere), and whatever POV stands for would be the margin. If you think someone's expensive: either they've got an expensive supplier, or you don't know WSP, or they are making the most of you. (But remember, 8-'till-laters work hard to earn a living, they do need some margin) P & H price-list - as a major distributor these prices will be around the "good as one can get" mark. E.g. Haagen-Dazs 100ml £23.99 for 24x = £1 per tub        Hovis Soft 800g £1.14 ea        Cheesestrings Cheddar 21g £9.24 for 24 = £0.385 ea        "What not butter" 1Kg £18.14 for 12, £1.51 ea Or just marvel at what crap you can stock your shop with.... It's only a bit of searching, you could check your prices (different country) by searching specifically differently. (Look for who is delivering stuff) I do remember a local shop which was regarded as a rip-off to the extent some of my friends would steal stuff by way of compensation... not much though, Pot-Noodle here & there... L

Topic by lemonie    |  last reply

In search of LED 101

First of all, let me apologize if the questions to follow seem stupid in any way, and that those stupid questions have been covered somewhere else. I am trying to learn a few basics in the LED world, and to most people here, I would be classified in the "uber-uneducated" category. My first question is about timers. I have seen many topics covering "flash rate this" and "blinking sequence that". Are timers (555? PIC? etc) pre-programmed pieces, so that when you install (correctly), they go about their merry functions, or is there something I need to know otherwise? I have seen tuts about POV which I believe is something that needs programming (obviously for designs), but where/how do I obtain the knowledge and/or equipment to perform such tasks (PC program, the little thing to hook it up to PC, etc)? I have seen consumer items with "variable" blink/flash patterns, like 5, 3, 2, 4, then it repeats. Is this the same, or....? (perfect example would be those like flashing LED police/fire/ems lights) Can flashing/blining be obtained by adding simple transistors (is that the piece im describing?) in the sequence? Another question I have is about the LED specifications in general. When I see LED's offered for sale in places like eBay, or where ever, I see listings for XXX mcd. Am I correct in assuming that this is the so called "brightness" of the item? I want to build projects that have high visibility, but not at the cost of an arm for some of the items I have seen for the higher rated XX,XXX mcd. These are just a couple of many questions I have, and there are so many great projects here, any help in LED 101 would be greatly appreciated. I have learned alot already, I just need a few basic pointers. Thank you for letting me waste your time :)

Topic by bullard    |  last reply

OggVOSH: The (soon-to-be) Open-Source Ogg Vorbis Player

I've been eying the VS1000, a little bitty chip that is basically an all-in-one Ogg Vorbis player, just add a crystal & memory. Its so beutiful, so tiny yet so complex... it even has a great default firmware. I've finnally got around to making this. I'm sending the PCB off to be made, and getting parts to prototype. Stats? Size: 2.19"x1.48", roughly twice the size of a new shuffle, or half the size of a new nano. I haven't figured out depth, but it uses li-on batteries, so it will not have a lump on the back, it should be comparably thin.Capacity: uses microSD cardsConnections: 3.5mm stereo headphone jack, microSD card, and miniUSB. Via miniUSB, you can charge the battery, as well as read/write to the SD card.Audio Support: Only Ogg Vorbis, but then again, it is the best codec, you can convert everything to it ;-) Max bit rate: 500 (beat that Apple!)No screen :-(Cost:This is tricky. For me, if I didn't buy any spare parts, its going to cost me $100. If I had an SD card, it'd only be $80. If I semi-mass produce them (more than 20), I know I can cut at least $10 off that price.So, it pretty much beats the Daisy, our, the OS/DIY community's, current audio device all around. Except one thing... it isn't a beginners project, involving nearly all SMD components, the only exception being the headphone jack. And the main chip is a bit of a pain to solder -- 12 pins on each 1 cm side ;-)Still, I think this is promising... along with my micro-POV... in making things smaller, like the "real" devices :P

Topic by zachninme    |  last reply

Official Instructables UK Meet Up - October 30th 2010

Jayefuu and I are planning to run the second Instructables UK Meet Up. We did not publicise the first meet up too much, as with it being the first one we wanted to take things easy. Now with a little more confidence, I think a forum topic inviting anyone interested to come along is perfectly suited. We plan to have a electronics based meet up, but some of the attendees are planning to bring along other projects, so you would be more than welcome to bring along something you are currently working on, or a few projects you would like to show off! The planned date for the meet up is Saturday the 30th October.  We will start off nice and early at 10am, and keep making through the afternoon, and into the evening, aiming to finish up around about 7pm. If you are turning up late, or leaving early, that's fine, we want to keep things fairly loose. We are holding the event in my local town of Alfreton, Derbyshire. Attached are a few maps showing alfreton, and also the Hall where we are hosting the meet up. The name of the place we are using is New Life Church, street view of the church is attached also. (if you want further travel directions, or help with accommodation just comment or PM) Anyone who is planning to come along, if you could comment below, or PM me. I need to get a good idea of numbers in order to plan accordingly! We plan to arrange to provide lunch, and will make decisions about dinner depending on turn out (we may just order in some fish and chips). To help cover costs we are asking for £5 for the day, this will include the cost of lunch, drinks and other general costs.  Thanks to Lizzy, and Steve, we should have a few kits to play with also. Listing those here so people can think what they might do. If you want to put your name down for a specific kit, just leave a comment below. Name  AMPLIFIER PROJECT KIT (PACK OF 5)  - £13.98 (2.70ish each) VELLEMAN FLASHING LED SWEETHEART KIT -  £5.58 VELLEMAN ROULETTE KIT - £11.10 MOBILE PHONE OPERATED SWITCH - £8.17 VELLEMAN SHAKING DICE KIT - £8.99 Reserved for Lemonie - VOICE CHANGER KIT RC - £10.52 POV WAND PROJECT KIT - £6.29 I am still hoping to source some drawdio kits, but thats harder than it sounds in the UK! I look forward to hearing from you! Jake - gmjhowe

Topic by gmjhowe    |  last reply

Arduino Multiplexing Code Issue

I'm trying to select a pattern for 12 multiplexed leds (2x6) using the input from a pot. The different patterns are stored in arrays. To complicate matters two of the states include a blinking led, the first, redShift attempts to blink a single led, 1, using a for loop to step through an array. The other holds on leds 2-11 and flashes 12 using the same method. The input from the pot is diveded into 12 sections and a switch case is supposed to select the proper arrays to read from. Here is the code: //LED TEST 2 w/ 74HC595 //by Bwrussell 2013 // /* Program Flow/Intent: Hardware: a 2 rows by 6 columns LED matrix running through a 595 shift register, arranged in a single line, and a potentiometer. The pot's input is divided into 12 ranges. These ranges correspond to incrementing LED patterns. There are 3 different types of pattern, the first blinks only the first, red, LED, the second covers 9 ranges and each one turns on an additional led, keeping those behind it on, the final type has all but the first LED on and blinks the final one. */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ //pin connections- the #define tag will replace all instances of "latchPin" in your code with A1 (and so on) #define latchPin A1 #define clockPin A0 #define dataPin A2 #define potPin A5 // analog pin for reading the pot's input. //looping variables byte i; byte j; //LED state storage arrays byte firstStates[] = {2,6,14,30,62,62,62,62,62,62}; //first row, non flashing, states byte secondStates[] = {0,0,0,0,0,1,3,7,15,31}; //second row, non flashing, states byte redFlashO[] = {1,1,1,0,0,0}; //row 1 states for red flashing byte redFlashT[] = {0,0,0,0,0,0}; //row 2 states for red flashing byte greenFlashO[] = {62,62,62,62,62,62}; //row 1 states for green flashing byte greenFlashT[] = {63,63,63,31,31,31}; //row 2 states for green flashing //Function variables byte dataToSend; //used in standardShift function byte redSend; //used in redShift function byte greenSend; //used in greenShift function //Storage variable byte normalState; //holds the array position for non flashing states byte redFlashingState; byte greenFlashingState; int rowOne; //passes the non flashing state of the first row int rowTwo; //passes the non flashing state of the second row int position; //holds the output from the potRead function void setup() { //set pins as output pinMode(latchPin, OUTPUT); pinMode(clockPin, OUTPUT); pinMode(dataPin, OUTPUT); Serial.begin(9600); } void loop() { position = potRead(); //read the current knob position switch (position) { case 0: //blink red led redShift(); break; case 11: // blink green led code here greenShift(); break; default: normalState = position--; rowOne = firstStates[normalState]; rowTwo = secondStates[normalState]; standardShift (rowOne, rowTwo) ; } } void standardShift (int firstRow, int secondRow) { byte stdArray[] = {firstRow, secondRow} ; for (i=0;i<2;i++){ //send data from ledData to each row, one at a time byte stdData = (1 << (i+6)) | (63 & ~stdArray[i]); // setlatch pin low so the LEDs don't change while sending in bits digitalWrite(latchPin, LOW); // shift out the bits of dataToSend to the 74HC595 shiftOut(dataPin, clockPin, LSBFIRST, dataToSend); //set latch pin high- this sends data to outputs so the LEDs will light up digitalWrite(latchPin, HIGH); } } int potRead () { int potRaw = analogRead(potPin); int potPosition = potRaw / 93; //returns a value 0-11 return potPosition ; } void redShift() { for (i=0; i<6; i++) { byte redArray[] = {redFlashO[i], redFlashT[i]} ; for (j=0; j<2; j++) { byte redData = (1 << (j+6)) | (63 & ~redArray[j]); // setlatch pin low so the LEDs don't change while sending in bits digitalWrite(latchPin, LOW); // shift out the bits of dataToSend to the 74HC595 shiftOut(dataPin, clockPin, LSBFIRST, dataToSend); //set latch pin high- this sends data to outputs so the LEDs will light up digitalWrite(latchPin, HIGH); } } } void greenShift() { for (i=0; i<6; i++) { byte greenArray[] = {redFlashO[i], greenFlashT[i]} ; for (j=0; j<2; j++) { byte greenData = (1 << (j+6)) | (63 & ~greenArray[j]); // setlatch pin low so the LEDs don't change while sending in bits digitalWrite(latchPin, LOW); // shift out the bits of dataToSend to the 74HC595 shiftOut(dataPin, clockPin, LSBFIRST, dataToSend); //set latch pin high- this sends data to outputs so the LEDs will light up digitalWrite(latchPin, HIGH); } } } I'm having two issues. First, the switch case doesn't appear to be working. I've monitored the pot input but there is no response from the LEDs. The second is with the for loops that are suppose to run the blinking. I know the loop on the inside will hold a pattern but in test code, without the pot, but adding the outside loop to step through the pattern array breaks it and the LEDs don't respond. Is the for loop running to fast to respond but not fast enough for POV? do I need a third loop that repeats each position but wouldn't that break the POV for the other LEDs? Or is there some stupid error I'm missing?

Question by bwrussell    |  last reply

[newsletter] Ultrasonic Batgoggles, Miracle Fruit, Giant Lite Brite...

Sign-up for our newsletter here. May 29, 2008 Welcome back! Have a cool signature for your user name? Share it with the community at this signature collection post. Lots of people have been ordering shirts from our new store. The free shipping only lasts through tomorrow so order now!Want to win some magnetic photo rope to display your pictures? Enter our caption contest!Coming soon... a new contest based on travel tips. Check out these cool Instructables! Go Online without Getting Snooped: Tor (The Onion Router) Want to get online on a network that likes to snoop? Try using TOR. posted by w1n5t0n on May 27, 2008 Ultrasonic Batgoggles Experience echolocation and learn to "see" with your ears. posted by suneth on May 27, 2008 Cheap, easy, low-waste platform bed Build a queen size platform bed with storage space underneath for less than $30, in about an hour, and learn some basic carpentry skills in the process. posted by aeray on May 19, 2008 Make a $5.00 "Space Pen" for your wallet Put handy space pen in your wallet so that you can write upside down whenever you want. posted by doctor_wu on May 25, 2008 How to Build a Hank Drum Build your own unique drum from a propane tank with just a few basic tools. posted by Hermes on May 20, 2008 Make you own wearable arc reactor and be cooler than Tony Stark! Want your own arc reactor like the one in Iron Man? Here's how to do it. posted by mspark400 on May 26, 2008 Giant Lite Brite The original Lite Brite was cool, but a 4' x 4' version is better and allows for multiple kids of all ages to play at once! posted by noahw on May 22, 2008 Make Biodiesel! The biodiesel story continues with the method of making the biodiesel itself. posted by drinkmorecoffee on May 22, 2008 Win amazing LED POV kits! Closes for entries on Sunday! Green Science Fair! Lightbulb "green"house The humble light bulb may be on its way out, but instead of trashing them you can give them new lives as tiny greenhouses. posted by LinuxH4x0r on May 26, 2008 Growing Your Own Miracle Fruit A guide to help anyone willing to grow the exotic and highly rewarding Miracle Fruit. posted by Putzer on Jun 27, 2007 Shoot the Rainbow: Skittles Vodka Loved Skittles as a kid and want to enjoy the flavors in a new way now that you're an adult? Skittles vodka may be just the thing for you. posted by applesticker on May 27, 2008 Dell Laptop into Digital Photo Frame That outdated laptop may be too slow for your new applications, but it can still serve as a sweet photo frame. posted by vorin on May 24, 2008 Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus    |  last reply

[newsletter] Flux Capacitor, Bike Blender, Grow a Pineapple...

Sign-up for our newsletter here. June 5, 2008 Welcome back! We launched our Lonely Planet Travel Tips Contest. Share a great travel tip and win some fantastic photo books as well as guidebooks, phrasebooks, and t-shirts! The Discover Green Science Fair for a Better Planet Contest closes for entries this weekend! Submit your Instructable soon to win the Celestron SkyScout. The voting has closed for Park Tool Bike Month. Check back later today to see who won! Check out these cool Instructables! DIY Flux Capacitor Get ready to go back... to the future! 1.21 gigawatts not required. posted by sponges on Jun 3, 2008 How to create a bike blender for less than $25 When the love of biking and the love of smoothies come together it can be a beautiful, and tasty, thing to behold. posted by I_bike on Jun 1, 2008 The Conetenna - a wi-fi antenna The quest for improved wi-fi continues with this massive cone variation of the cantenna. posted by Shadetree Engineer on Jun 1, 2008 How to Grow Pineapples Pineapples are easier to grow than you think. Get a pineapple and some dirt and you're most of the way there! posted by woofboy111 on May 30, 2008 Japanese lamp from recycled materials A cheap but attractive paper "shoji" style lamp that uses mostly recycled parts and is easy to put together. posted by PKM on May 29, 2008 How to make an Iron Man Mask Whether you're stuck in a cave or have some time at home to build, these instructions will help you get that superhero look. posted by msraynsford on May 30, 2008 Repainting an Old Bicycle Want to keep your old frame looking good as times and styles move on? A new paint job is likely in your future. posted by Dr.Paj on Jun 1, 2008 Etching brass plates Adding some brass adds a bit of class to your project. Learn to etch and you can include a sweet custom finishing touch. posted by gotang on May 27, 2008 Win amazing LED POV kits! What have you done for robots lately? Closes for entries this weekend! Handy Bike Mods and Projects This collection of things to do to and with bicycles will provide plenty of ideas for your next two-wheel project. posted by TimAnderson on May 30, 2008 Illuminated Keyboard Hack Turn your ordinary keyboard into an illuminated one for under $5. This is an easy keyboard mod that takes about a half hour to do. posted by Kipkay on May 30, 2008 Bike Generator Attach a generator to the rear wheel and power up both the front and back lights. Never worry about the batteries dying again. posted by dbc1218 on Jun 1, 2008 Zigzag Pop-Up Here's a quick pop-up that only takes a few minutes and has a nice effect. All you need is a printer (preferably color), paper, and something to cut with. posted by fungus amungus on May 30, 2008 Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus  

Daft Punk Table Replica driver board reverse reconstruction.

I'm in love with the daft punk table:'m actually making a wall hanging rather than a table because theres no room in my studio for another table.The author of that instructable didn't include the microcontroller program or a circuit for the driver board. From the description (and looking at another site) we can tell that it uses a a couple I2C port expanders connected to a transistor array. I have both the PFC port expander and the ULN2803A in my parts box, but I think it can be made cheaper, faster, and expandable.I want to ditch the I2C bus. Why? 1. Its slow (100 or 400 khz), not that more is needed, but what about bigger boards?2. Its bit intensive: each chip update requires a)start signal, b) address byte, c)port setting byte, d)stop signal. That's more than 8 bytes of bits per table update.3. Its expensive: the i2c bus needs 2 pullup resistors, and you have to route Vcc to them on the PCB. I2C peripherals are a bit pricey ($1+ for the PFC i2c port expander). You need a UC with hardware I2C, or write a I2C software routine, etc. 4. Its not expandable beyond the assigned number of I2C addresses. The PFC chips have a limited number of address selections (determined by the state of 3 pins). If all addresses have been used then a second I2C bus would have to be added.These goals can all be accomplished with a handy chip I learned about in lady ada's bike POV instructable, the 74HC(T)595. The 595 is a serial to parallel port expander with 8 output bits. The interface is a simple 3 line affair with serial data/clock lines and a latch that puts the data on the pins. Now the cool part: several can be connected end-to-end so that you can create a chain with hundreds of extra outputs. Bits can be clocked in at up to 20Mhz, so large or multiplexed grids are possible.Why its good:1. Its fast, up to 20 Mhz2. Simple interface - clock in only the bits needed then set the latch. 26 bits, <4 bytes per refresh.3. Its cheap: 0.33 per chip, easy 3 wire interface can be operated with microcontroller, PC parallel port, or even buttons.4. Massively expansion potential, multiple chips can be chained for a disgusting number of outputs.The circuit is pretty basic. It only includes those things needed for the graphics card : I/O expanders, transistor array, connection headers. Power supply and control unit are separate components. The 595 has a 'blank' pin, it seems to reset all the chips to a known state when pulled low. I wanted to make it available for a 'more complete' design, but I also included a jumper so that it can be manually disabled for use in simpler implementations.The 3d is just for fun: the PCB is mostly unrouted.Any comments or suggestions? Has anyone used the 595 before? I've ordered a few to play with, but have not yet used them.

Topic by ian    |  last reply

Get Paid for your Hardware Projects

Looking thru all of the cool projects here, it seems like there are too many projects that took tons of effort, sitting in attics. Or they're being used by the project designer, but no-one else can benefit from the designer's hard work. A lot of people would love to try some of the projects you've come up with, but they're not sure where to start.Here's what I'm proposing;- I'll keep a stock of the most useful components (passives, IC's, etc). I'll also keep stock of several 'generic' project PCB's.-You come up with a cool project using these components, Or modify a project you've already done. Once you've got it done, send me your source code / design and a Howto.-I'll publish your projects on my site, and I'll market my site to drive hobbyists. I'll spend real money marketing it, driving traffic so that thousands of folks will visit and check out your projects.Here's the best part; If a visitor thinks your project is cool, they can order the materials to build it. I'll take care of shipping, inventory, payment processing, etc, and I'll share the revenue with the project designer. Imagine if your hobby paid some bills instead of making them! And all you have to do is write up a 2 or 3 page 'How I did it' and share your code.HOW TO GET INVOLVEDI need to do a fair number of things on the business side, so I won't be ready to launch for 2-3 months. Before I can launch, though, I need to figure out what the inventory of components should be. There are two ways to get involved;IF YOU HAVE A PROJECTGo to the website and submit a brief description and a Bill of Materials (BOM). The BOM is the most important. Once I've collected enough BOM's, I'll build an initial component inventory for projects. Try to be thorough with the BOM (Everything but solder). Your project doesn't need to be done (or even started), but if you share your project now, you'll get priority listing when the site is launched.IF YOU WANT TO SEE A PROJECT AVAILABLEVisit the website and drop me a note. I'll collect project ideas and see if any designer are interested building it (or chase down a designer who already did).My goal is to let other folks enjoy your awesome projects and appreciate your work. You'll also be able to make some money with your hobby, too. All feedback is appreciated!To get you thinking, a few projects I've seen around or think people might find cool; 'IRC client in an altoids tin', Music Visualizer, C64 wiimote baseball bat, LED stock ticker, Homemade portable MP3 player, POV clock / 3d display, Guitar Hero kit, LED lighting system, 3d printer, Parking assistant, SIM card reader, Metal detector, GPS logger / tracker, Balancing Robot, Remote Camera recorder, PS/2 Keylogger... Whatever! At this point, I don't need completed projects, just an idea of what they are and the Bill of Materials.The only way to make this project viable is to limit the inventory depth. By submitting projects now, I'll be able to build an inventory that will best support your ideas.The website is Thanks in advance,Nick

Topic by Gadget Gangster    |  last reply

[newsletter] Light Sabers, Plasma Globe Tricks, Wall-E Robot...

Sign-up for our newsletter here. June 12, 2008 Welcome back! RoboGames starts tomorrow. If you can't make it this year, then you better enter our Robot Contest in the next couple weeks. The grand prize is a trip to RoboGames 2009! Winners have been announced for the Park Tool Bike Month. See who won! Check out these cool Instructables! Cheap Custom Lightsaber Build your own Battle-Ready Lightsaber! Use a good light source, and build it for cheap! posted by Ricardoaraujo on Jun 3, 2008 Turn a Cruise Full of Old People into a Death Defying Adventure In the immortal words of former Gov. Jesse Ventura, sometimes you gotta defy death in order to enjoy life. posted by iwasthinkingaboutsoup on Jun 9, 2008 Animate with light Learn how to make your own snazzy light-animations on the cheap for a music video or any other project! posted by buenoben on Jun 10, 2008 Wall-E Robot The movie comes out in a couple weeks, but you can start building your own Wall-E right now! posted by 4mem8 on Jun 6, 2008 Electroforming an Iris Seed Pod Commonly referred to as "dipping" in metal, this technique can make organic items permanent for jewelry. posted by MaggieJs on Jun 9, 2008 How to rejuvenate a box fan Many box fans are tossed just because they're too dirty. Here's how to clean one up for a few more years of use. posted by jgodsey on Jun 8, 2008 Ping Pong Ball Lights Sometimes you really need the diffuse glow of dozens of ping pong balls with Christmas lights in them. posted by advancedMischief on Jun 8, 2008 The ultimate, heavy duty, stackable, bullet proof, extreme saw horses! OK, maybe not quite bullet proof, but everything else is accurate. posted by Mikey D on Jun 1, 2008 Make your own tote bag from recycled plastic bags With a little time and creativity you can make some pretty cool stuff from all those plastic bags like this big tote bag. posted by user669 on Apr 8, 2008 Light Bar Ambient Lighting Add a bit of a colorful glow anywhere you want with a little bit of work and some inexpensive parts. posted by QuackMasterDan on Jun 9, 2008 Cable car Know someone who has trouble with stairs? A powered lift can help them move around more easily. posted by Mockfish on Jun 8, 2008 Win amazing LED POV kits! What have you done for robots lately? Winners to be announced next week. Make a High Voltage Supply in 5 Minutes Learn how to get up to 1,000 volts in just a few minutes. Be careful with this one! posted by Biotele on Jun 8, 2008 Creating, cutting and printing your own woodblock Learn the basic process for buying tools, cutting a woodblock, inking and then printing with it. posted by rbanks on Jun 6, 2008 Amazing plasma globe tricks! Just touching a plasma globe can get boring, so check out these new tricks. posted by highvoltage2000 on Jun 7, 2008 Plastic Bag Rug! This rug is pretty easy to make, looks really cool, and costs almost nothing! posted by denona on Jun 11, 2008 Leather Bracelets from Recycled Belts Make up to three custom leather bracelets from an old leather belt! posted by fungus amungus on Jun 6, 2008 Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus    |  last reply

Observing single photons (may be future Instructable)

In a thread on building a DIY Geiger counter, I mentioned that it's possible to do an experiment to see single photons directly with your eyes. This is a lab we did when I was an undergraduate, more than 20 years ago. I haven't done the setup myself since then, so I'm just going to describe it; if I have the opportunity run it again, then I'll make an I'ble.If someone else decides to tackle it, please feel free to write it up yourself!The human eye detects light via a family of proteins called opsins. Different forms of photopsins are sensitive to different wavebands, which is what gives us color vision. Rhodopsin is sensitive mainly to greenish-blue light, and provides us with monochromatic night vision. Rhodopsin works by changing its conformation when it absorbs a photon; that change of conformation allows ions to flow through the rod cell's membrane and generate a signal. The signal from each rod cell is processed through the retina and passed to the visual cortex, where a representation of the visual field is constructed.Human rhodopsin has a quantum efficiency of about 25% (there's a 25% chance a single photon will be absorbed and produce the rod-cell signal). By comparison, cat rhodopsin is more than 90% quantum efficient. 25% QE is sufficiently high to be observable -- a source of single photons can be seen by a dark-adpated person with normal vision.You'll need a steady source of well-collimated photons. A green laser pointer (~532 nm) will do nicely. But how many photons does it generate? A wavelength of 532 nm corresponds to 3.53×10-19 joules. So a small 1mW laser pointer puts out 2.8×1015 photons per second (watt = joule/s). How do you reduce that to one photon at a time? With filters. An ND3 neutral density filter reduces the output light by 10-3 compared to the input, so a stack of just five ND3's in front of this laster pointer would result in (on average) just 2.8 photons per second! A stack of four ND4's would give you 0.28 photons/s on average.If you don't have neutral density filters, you can make a decent approximation, by stacking sheets of black trash-bag plastic. To make this work you have to measure the attenuation yourself, so you'll need a photodetector, something which gives an output (voltage, resistance, current, whatever) proportional to the intensity of light.Once you have your single-photon source, you need to set it up in a completely dark room. If you have access to an old-style photographic darkroom, use it. Otherwise, use thick (3-5 mm) black felt and gaffer's tape to seal any windows and doorframes. Put the laser on a table or stand pointed at your face, with the stack of NDs (or trash bags) in front of it. If you're doing this by yourself, you may want to have a piece of tape set up to hold the pointer's button down. Otherwise, your lab partner will take care of it.Sit in the dark for 20 to 30 minutes. This will seem like forever, so you may want something to help you keep track of the time. A standard CD will be about half finished, or you can get through ten pop sons on your iPod, when your eyes become dark adapted.Turn on the laser. You'll see intermittent flashes all coming from nearly the same place in your visual field; if you turn your head, the location will move in the opposite direction. If you've used filters to get down to a few flashes per second, POV will make them easier to see. At less than one photon per second, you'll see them individually.

Topic by kelseymh    |  last reply