remote controlled light - revisited

Hello, Instructibles gang…. I originally posted a similar question over the weekend, and then got some feedback telling me that there wasn’t enough information to bring in worthwhile responses. My intention wasn’t to be secretive.  Rather, it’s a project that’s still in the planning stage and there aren’t yet many specifics. But I think I can still flesh it out a little bit, and hopefully gather some more specific suggestions. I’m planning a sort of a scavenger hunt thing coming up in October. Most of the stops/stations will be fairly straightforward “orienteering”-type scenarios: “20 paces at 250 degrees,” “north to the hollow stump,” that sort of thing. But I still want to mix it up a little bit. One of the ideas that’s swimming around in my noodle is that, at one stop, folks will be told to “push the button.” It will be dark, so they’ll have to hunt for the “button”… basically a doorbell… and maybe secured to a tree (in such a way as not to harm the tree). When they press the button, a light will be illuminated at a short distance, leading them to their next stop. I know that I could easily do a simple circuit with actual wire, but it would be far nicer to achieve the same result wirelessly… and even though I’m not very electronics-savvy, I imagine it would also reduce the problem of resistance in the circuit. This only needs to operate over a relatively short distance… almost certainly less than 100 feet… probably much less. And while it must be able to operate out of doors (a woodland trail in a rural/suburban park) it only needs to last for a few hours. An LED… or maybe a chirping sound effect… something that would draw seekers from one spot to another. Thanks for any suggestions. And please let me know if more information is needed.

Topic by Purple Chez   |  last reply


how to connect game consuls to a smart tv

I have a samsung led smart tv and want to connect games consuls to it, can this be done?

Topic by Joe Revie   |  last reply


LED light from wind turbine

We are playing around with various basic LED lighting from a small wind turbine and have a couple different ideas about how to build.  But we are wondering what the voltage range LED lighting can handle?  Even a small turbine can create a wide range of wattage based on the speed of the wind, at what point are we going to be doing damage to our lighting?  Do we need to come up with some sort of wattage dampener/regulator between the generator and the lights?  Simplicity is key in our design.

Topic by Two Paddles Design   |  last reply


electric release latch

Hi! I'm trying to figure out how to go about creating a latch where applying an electrical current would release it. Probably something involving an electromagnet. I apologize (1) for the sudden flurry of board posts, and (2) if this is not the best board for this specific question - I know it's not exceptionally techy, but it looked like the best option. Thanks!!!!!!!!!

Topic by Purple Chez   |  last reply


tunnel diode,s

Can you tell me a place that sells tunnel diode,s? I found one tunnel diode in a jvc radio but I lost it.:-( can you tell me the best free schematic drawing programs for Win XP,also.Thanks

Topic by maker12   |  last reply


Help with annotate function in python

Hi everyone I'm trying to plot live data on Python from an arduino through the serial port. I found some difficulties with annotate function. I don't know how to configure it or whether the place where I have put annotate function is it the the right place or not For example: for every point in temperature, i want the value to be printed next to the point ? this is my python code import serial # import Serial Library import time #import time import numpy  # Import numpy import matplotlib.pyplot as plt #import matplotlib library from drawnow import * temperature= [] vitesse= [] charge= [] current= [] Time = [] arduinoData = serial.Serial('com5', 9600) #Creating our serial object named arduinoData plt.ion() #Tell matplotlib you want interactive mode to plot live data cnt=0 ##fig1 = plt.figure() STARTINGTIME = round(time.time(),2) def makeFig(): #Create a function that makes our desired plot     plt.subplot(2,2,1)     plt.subplot(2,2,1).annotate(str(temperature)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Temperature Sensor Data')     plt.ylabel('Temperature C')     plt.grid(True)     plt.plot(temperature, 'ro-')     plt.subplot(2,2,2)     plt.subplot(2,2,2).annotate(str(vitesse)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Speed Sensor Data')     plt.ylabel('Speed KM/H')     plt.grid(True)     plt.plot(vitesse, 'bo-')     plt.subplot(2,2,3)     plt.subplot(2,2,3).annotate(str(charge)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming SOC Sensor Data')     plt.ylabel('Battery Charge %')     plt.grid(True)     plt.plot(charge, 'go-')     plt.subplot(2,2,4)     plt.subplot(2,2,4).annotate(str(current)+','+ str(Time), textcoords='offset points')     plt.title('Live Streaming Current Sensor Data')     plt.ylabel('Current A')     plt.grid(True)     plt.plot(current, 'yo-') while True: # While loop that loops forever     while (arduinoData.inWaiting()==0): #Wait here until there is data         pass #do nothing     arduinoString = arduinoData.readline() #read the line of text from the serial port     dataArray = arduinoString.split(';')   #Split it into an array called dataArray     temp = float (dataArray[0])     vite = float (dataArray[1])     char = float (dataArray[2])     curr = float (dataArray[3])     temperature.append(temp)                     #Build our temperature array by appending temp readings     vitesse.append(vite)                     #Build our vitesse array by appending temp readings     charge.append(char)                     #Build our charge array by appending temp readings     current.append(curr)                     #Build our current array by appending temp readings     Time.append(round(time.time(),2) - STARTINGTIME)     drawnow(makeFig)                       #Call drawnow to update our live graph     plt.pause(0.00001)     cnt=cnt+1     if(cnt>50):         temperature.pop(0)         vitesse.pop(0)         charge.pop(0)         current.pop(0)

Topic by SoufianeG 


remote control light

I'm working on a sort of a scavenger hunt thing. Night time on an outdoor trail. For one station I would like to have a set-up where a seeker would press a button (like a doorbell) which would light an LED, telling them where to look. I know that I could connect a battery, a button, and some sort of a light using actual wire, but it would be great if I could do this wirelessly. It would only have to work over a short distance (a few dozen feet at most) and only for one evening. I'm not especially electronics-savvy, but I work well with instructions. I'd appreciate any leads!!!

Topic by Purple Chez   |  last reply


electronic "key"

One more forum post and then I swear I'll take a break!!! I would like to build a sort of a "secret box," where access would be had through a sort of electronic "key." A few specifications: (1) the box would be permanently out of doors, and (2) the "key" would be simple enough that I could give interested parties the schematics and tell them to make one. I'm thinking a USB connection would be a natural, but I'm not an electronics person, so I'm open to all suggestions. Thanks!!!!!

Topic by Purple Chez   |  last reply


how do I control brightness of RGB Led using PWM module

Hi,  I'm new to using Programming integrated circuit (PIC), I just acquired a PICKIT 3 made up of PIC18F45K20 Microcontroller. I'm need help understanding how to control brightness/ dimness of a RGB  led using PWM. The problem here is most tutorial I've come across only explain how to do this using one or more of the same type of led (same color). I need a tutorial explaining how to control brightness of red green and blue and whatever dimness state (say 20%) is, it remains in the same brightness when i pick a different color. if someone can direct me to a tutorial on how to configure RGB (not just LEDs) and using PWM. that would be much appreciated.

Topic by nigho4real   |  last reply


Printing a circuit on clear plastic?

Hi Guys Inside most modern keyboards, you find a rubber membrane that presses a sandwich of three layers of plastic, with the upper and lower parts having circuits on them that make the contact. Is it possible to 'print' this type of circuit at home on standard laser or inkjet printers?  I could use Amanda's method with bare conductive ink, but printing would be better. Any info appreciated ;)

Topic by wizer   |  last reply


PARTS TO BUILD LED SEQUENTIAL LIGHTS-AUTO

WHERE CAN I GET PARTS TO BUILD SEQUENTIAL LIGHTS FOR AUTOS, I WOULD LIKE TO BUILD MY OWN AND NOT BUY A KIT  

Topic by DELETED_DelmarM   |  last reply


How To Stop A Shutdown/Restart in Windows

This is for when you accidentally or on purpose start a shutdown or restart. It will stop it immediately. I used it a couple days ago, having stumbled on it some day on the intertubes, and it saved me from having to restart.Press the Windows key on your keyboard and R, or open it from the Start menu. Type shutdown -a and click OK/ press enter.

Topic by Aeshir   |  last reply


solar question

Do solar panels have to be in direct sunlight? I'm looking to make a "Sun Jar" and was wondering if it would work on my balcony. The only thing is our balcony doesn't get direct sunlight to it as it's inset into the building and covered by the above apartment's balcony.

Topic by mrshow555   |  last reply


Read from a 7-segment display LCD

Hello everyone. Suppose you have some device with a numeric LCD display with some 7-segment digits (i.e. a digital scale), and you want to hack it in order to read out electronically (for example with an rs232 connection), while preserving functionality of the thing. How you would do that?

Topic by avvelenato   |  last reply


LED wiring/resistor

I'm a beginner in understanding electronics so please bare with me. :) what kind of resistor should I use in lighting 4 LED's with 9 volts battery? I really need your answers. :) Thanks in advance :)

Topic by imatrianidar   |  last reply


No, that doesnt look right... Potentiometer Expert Needed!

Hi All! My brother and I are building an e-bike and we THINK we know how to attach a throttle, but it might blow up the battery... if worse comes to worse then we have a toggle button we can install but it's not really ideal. I've attached a circuit diagram below of how everything goes together, but this is my thinking; With nobody touching the throttle, in my circuit, wont i have a current flowing from the battery anode via the potentiometer straight back into the battery cathode? This results in a huge waste of energy doesnt it? And the battery would drain even when the bike is stored in a hallway overnight.  So, does anybody know if this circuit will work? i need it to take energy from the battery ONLY when active.

Topic by Tsimbilakis   |  last reply


How to regulate amprage for a combat robot

Hi everyone I am currently in the process of designing a combat robot with a max weight limit of 250lbs. the current drivetrain motors that I am using need 200 amps minimum to move the robot if fully loaded to 250lbs. The max stall amperage the motor will draw (when the stall torque is reached) is 856 amps I can not currently find an electronic speed controller that can safely handle that many amps or is in my price range. So my thought was to buy a 300-400 amp ESC and then set up an amperage regulator so that if the motor stalls and asks the ESC for more then 300-400 amps (whichever I decide to buy) when it asks the battery for that many amps the regulator will either block the current or only allow a safe amount of amps to the speed controller. I'm very new to detailed electrical side of this stuff so I don't know what exactly I'm looking for or where to find it. I would use a fuse but if the fuse blows in the middle of a match then I cant move which will cause me to lose by KO so what ever I do it must limit how many amps the speed controller can draw from the battery and then after it no longer asks for that many amps it allows it to function as normal. Thanks Guys!!  

Topic by CalebP5   |  last reply


inline volume control

Hi im ramanta from indonesia i try to add an aux in to my old boombox, the reference from here https://cocodrilabs.wordpress.com/2012/04/05/installing-an-auxiliary-input-on-a-stereo/ i already got it working, but the problem is the potentiometer(volume). Only one channels work my boombox has 2 IC Amp, one for each channel. I already try to connect the source(ipod) directly to the amp (without the pots), work like a charm. But the sound is too loud and distorted

Topic by ramanta 


Any good free electronic circuit design programs?

Hi, i'm a second year engineering student in need of free tech!  Can anybody recommend a decent circuit design program? I have access to programs like this at university, but thats 6 miles from my home and me and my brother want to build a electric bike. Thanks to all that can help =)

Topic by Tsimbilakis   |  last reply


HACK a Passive RFID Transponder/ tag

I use an Amtech transponder to access my neighborhood.  The signal strength is poor and the association isnt cooperating with me to have the system upgraded or to offer me a new style of transponder.  I opened one my my transponders and it appears to be a PASSIVE RFID device.   HOW CAN I MAKE A PASSIVE RFID TAG INTO AN ACTIVE TAG?  I.e. HOW can I add a battery and/or larger antenna.  ANY other suggestions that you can offer would be appreciated.  

Topic by mmrogge   |  last reply


LED disk monitor

I'm thinking of making an LED based hard drive monitor that will show the % of free space. My thoughts are either an Electric Imp or a Spark Particle wifi controller and then some kind of OSX script that runs  on my server to read the disk usage and push it to a web server. I'll be using APA102 or LPD8806 strips. Any thoughts or suggestions? Cheers.

Topic by filthyPhil   |  last reply


recharging the battery in a polaroid type600 film pack

Anybody know how to recharge the 6v polapulse battery in a polaroid 600 film pack? I'm trying to rig the whole camera up to a dslr body (essentially replace the "film capture" with digital) and fire the shutter on the 600 camera. Apparently, you can't fire the shutter without juice, and from what I understand, the 600 film battery only holds enough juice to fire 10 frames, the length of one film pack. Can anyone offer any suggestions? Maybe rigging up 6v worth of juice and connecting that to the camera itself?

Topic by poozoodle   |  last reply


Inkless printer- Laser or Heat to engrave Paper

Hello,I am currently searching for projects that print on paper using heat, lasers or other inkless technology. The problem I ran into is that a search for burn, laser and thermal in combination with printer and paper allways brings many results that are irrelevant (laser printers, thermal transfer printers and such).What I did find is http://www.flickr.com/photos/jabella/438212343/in/set-72157600033633262/ for example. Though commercial laser solutions seem a bit "too much" and overpriced to plot a bit on paper.Does anyone here have any links to projects that use heat or other methods to print on paper?I guess it could be as simple as a plotter using a weak soldering iron ;-)

Topic by schorhr   |  last reply


lm3914

So this is what I came up with eagle for the lm3914 can someone please verify if this will work as intended.

Topic by dominick.j.pezza 


clay or wooden compressed air canister

Had the idea but don't know if it will work don't know if clay would hold the pressure it would be used to hold compressed air for mechanical uses to power primitive machines also if it would work what do you think the psi rating would be if not wood or clay what other primitive material do you think i could use

Topic by Pokemon03   |  last reply


Charge controller CM3024z

Hi,  im a student, i just  wanna ask if i can use the charge controller CM3024Z to a Magneto (alternator) and coupled with a solar panel 50watts? does the solar charge controller are for solar panel only? thanks godbless

Topic by romeob   |  last reply


Need advice in creating a sound activated robot

Hi to everyone! I am new here and will really appreciate any help or advice on my project. Truth is, i am very new to electronics and thus, have little knowledge on how to proceed with my project. In summary, my project is basically creating a friend(robot) that will activate upon receiving electrical impulse from a mic. The motion it will have is basically the lighting up of LEDs (for the eyes) and the head tilting upwards (using servo or DC motor idk...) when sound is detected. However, i want the motions to be there for 30 secs even after there is no more sound before reverting back. I have done many research regarding this but it is just too complicated for me to understand. I would really appreciate it if the solution or advice is simple enough for beginner to understand. Also, i don't want "clap" activated, i want it to be sound activated like simply speaking normally. I would probably ask even more questions in the future, so, hope i will get along well with everyone here! p.s this project is a very scaled down version because i wouldn't be able to handle the full scale electronics...

Topic by DIYfreshie 


LM3914

So I looked up the data for the LM3914 followed the steps and I still cant get this thing to work I tried it two ways. I want to be able to set this up for variances of voltage say from 1.5V to 30 volts. Any advise would be great.

Topic by dominick.j.pezza   |  last reply


Make your own 3d Renderings

OK here is my proposal take: 1 machine 900, 000 concept + 2 existing instructables + common materialsa 3d scanning system Here is the concept please see it and come back:http://www.mova.com/movies/Steve_Perlman_Contour_Briefing-iPod.m4vWell if u already saw it, in a nutshell they use 2 different forms of light but no laser BUT in these 2 instructables they do https://www.instructables.com/id/David-3D-scanner/?ALLSTEPShttps://www.instructables.com/id/3-D-Laser-Scanner/ So, If we used an Amalgam of both plus:UV led's6 CHEAP webcams (x y and z )fluorescent paint We could obtain:A 3 d scanner for common objects that uses no lasers but the light sources in the demo (or even people perhaps not for animation but for other purposes) Those who did not get lost in the explanation: please contribute!Note for negative typists: Yes it is an adaptation and and I am asking for brainstorming yes, my explanations are terrible yes, yes, yes to all your negative comments.Note for those positive contributors: I will not ignore you at all please add your ideas!

Topic by dejabox   |  last reply


ATX Power Supply Conversion

Hi Again, My question is when building an ATX power supply, Can you join the 12 volt leads with the 5 volts leads to make 17 volts? If not how can I get lets say 20 volts. I am going to use a DC to DC converter to make a variable power supply. I would like at least 20V in then I can adjust from 1.2 to 60 volts out. I use it now running directly off battery but would like to add it to the ATX build case. Thanks for any help again.

Topic by Shorty954   |  last reply


ATX power supply conversion

I know this is a long passed DIY. But while building a ATX Power supply I separated all the wires as stated. I then put the green and a black wire to a switch and added the 3 brown leads to the orange leads. When I plug in the unit the supply light comes on, but when I turn the green wire switch the main power LED goes out and no fan comes on. It acts like the switch is shutting the unit off.  Can anyone help. I am 60 years old and just getting into doing some bench work to pass the time. Thanks for any help.

Topic by Shorty954   |  last reply


Design idea help needed- nightvision

Is it possible to create a night vision with the following circuit... fitted with scanning disk tv method (accept for the fact that i'll use multiple mirrors instead of disk with holes) of video capture and display. Will it be sensitive enough? what I plan to do is- In simple terms, ill be using atmega as ADC... and photodiode as signal input. output will be via port d... if value of input is 1, one led red is turned on.. if value is 2,one green led red is turned on.. if value is 3,1 red and 1 green if 4=blue if 8, 2 reds 9, 3 reds so on

Topic by Suraj Grewal   |  last reply


cheap pc racing wheel problem

Hi, i have recently buy a cheap pc racing wheel  i have a problem the wheel have a deadzone of 20° IN each direction so it annoying when playing game so, there is any fix to remove this deadzone? thanks, 

Topic by lamineovich   |  last reply


Projecting onto glass

Alright here's my question, I know I've seen it done a couple places, the first image I could find as an example was just this :http://www.en.dnp.dk/data/4418/3791/4418.jpg# (just see below)What kind of glass do I need to do something like this? I'd like to build a table of sorts out of glass with a projector built into the frame under it to project upwards onto the glass, then eventually perhaps adding an IR sensor and work towards building a touchscreen/MS-Surface-like table. Any thoughts? Obviously its not normal glass or the projector would just pass through it

Topic by ianidas   |  last reply


DIY ±18VDC to power a dead cordless drill

Hi! My last battery died on my cordless drill and i'm trying to transform it to a corded drill. My plan was to use a microvawe transformer along with a bridge rectifier (KBPC5010  Bridge Rectifier Diode, KBPC Series, Single, 1 kV, 50 A, 1.2 V, Module, 4) to power the drill. 120VAC from the wall to, I wish, 12to18VDC. The problem with this is the voltage given by the output of the microwave transformer is of only ±3VAC. Any sugestion?

Topic by rudecam   |  last reply


Controlling two servos with one pin and a NOT-gate

Here's an interesting idea. It may be possible to control two servos independently with only one output pin and an inverter/NOT-gate. Normally, a servo is at its 'center' position when a pulse is 1.5 ms & its angle (or speed for continuous servos) is based on the difference between the length of time of the pulse it received & the base-time of 1.5ms. The servo itself does not react to the time BETWEEN pulses however. If the signal was inverted, the result would be a pulse with a time being that of the time between pulses of the initial signal. If the width of a pulse and the time between pulses can be independently controlled, then it would be possible to control one servo with the signal directly, and another servo using the inverted signal. I found something similar here [http://www.diyrc.com/reversers.htm] but it seems to be intended for 'reversing' the signal used to control one of the servos.

Topic by Michael_Everett_Feder   |  last reply


wifi extension

Hello all! i need some help, is there a way i can make my wifi signal stronger without modifying my router, i normaly like to research/ play games in my room, where i only get 3/4 out of 5 bars. the router is under a tv and directly iv front of a wall separating me from it a simple map looks like this                                                                                         me                                                                            ----------------------------------------|                                                                           | 10 ft  thick wall (wood and sheetrock)                                                                           |                                                                           |                                                                           ----------------------------------------                                                                                                    router

Topic by Di Immortales   |  last reply


Help with Stepper Motor and Slip Ring

Hi All,    I need to figure out how to get power and control signals from a stationary computer / PIC into a series of subsequent rings via rotating joints. Ultimately, what I want to build is a form of motorized gyroscope that can transmit power and control signals to the inner ring motors. - I'm using a Raspberry Pi 2 to control three Stepper Motors. - The motors are getting power from an old AC/DC wall adapter. - I currently have 3x NEMA 17 stepper motors     - Yaw Motor/Axis     - Pitch Motor/Axis     - Roll Motor/Axis - I've got 2x 12mm 12 8-wire slip rings that I hope can be used to send the control signals from the Controller to each motor. The problem is that I'm not entirely sure how to connect those components together, let alone how to connect them to bearings to minimize tension on the motor shafts. (I'm a software engineer, not an EE or ME.) An example of what I want to build is this:  https://www.instructables.com/id/Multi-axis-Phone-Stand-completed-Version/ ( However I don't need anything in the middle, I just need a way to control the rotation of each ring layer independently by the stepped motors ) If anyone can point me in the right direction it would be much appreciated, Mike C.

Topic by MichaelC87   |  last reply


adding aux line in directly to boombox ampli

Hi guys i am Ramanta from Indonesia i have an old boombox, Sony CFS-1110s (similar mechanism with CFS-1100s) what i want to do is add an aux input to them. I have seen a lot of instrucrables about it, but nothing about this model. I find a similar unit here https://cocodrilabs.wordpress.com/2012/04/05/installing-an-auxiliary-input-on-a-stereo/ the aux in is conected directly to the IC Amps pin. I have the IC diagram, what i dont understand is this model have a dual IC8207k. One for each channel. TA8207K is a stereo IC, so how do i do the wiring? For single IC its just INPUT1-INPUT2-GND. In dual setting they have 4 input and 2 ground. I dont want to use any tape adapter since its sound terrible here i attach the complete diagram and schematic in PDF please give some tutorial, im a beginner in this kind of thing) hehe my email zramanta@gmail.com sorry for the bad english :D

Topic by ramanta   |  last reply


5.5v DC supply on a 12v LED ?

Hi thanks for reading. I'm building (from the ground up) a set of 3x6" > Amplified 3 watt stereo Planar full-range speakers to be powered from a Cell Phone. I have most of the required parts which are many. One of the parts of the system I'm installing is a Blue LED (Amp On) Indicator. I'm running the system from a USB Charger or a Cell Phone USB Port at 5.5 volts. I went forward and ordered the Blue LED's and they haven't arrived yet so I can't test. These LED's are from E bay with little info of course. They are said to be standard, Blue 2mm 12 volt LED's. (Not Ultrabright)  ------------------------------------------------------------------------------------------------------- My question to you who may know: Are (Rated) 12 volt LED's likely to light from a 5.5 volt power supply? I guess my confusion is between the 12v claim and the LED Color Standards for a Blue LED.. ------------------------------------------------------------------------------------------------------- Without knowing the complete situation, here is the resistor value I've been able to come up with based on *LED Color Standards (Blue) and Supplied Power (5.5v): (*Blue) LED calculator: Current limiting resistor value: Source voltage = 5.5v LED voltage drop = *3.5 LED forward current = *20mA (=) Current-limiting resistor needs to drop 2 Volts. The resistor value is 100 Ohms, the next higher standard value resistor is 120 Ohm. The resistor will have to dissipate 0.04 Watts, the resistor should be rated 0.067 Watts, a 1/8 Watt resistor should do it. Final: 120 Ohm, 1/8 Watt. (color code: brown red brown, Silver). (100 Ohm: Brown, Black, Brown, Gold). ------------------------------------------------------------------------------------------------------- Thanks for the help! I hope I made some sense here ;)

Topic by Rexrich   |  last reply


Best way to switch multiple circuits?

Hi, all - first time posting. I have limited knowledge with electronics and have come across a scenario where I basically need a kill-switch for a cable with 9 ends. I can't find any sort of toggle switch (SPST, DPDT, etc..) that would accommodate that many wires. I started reading up on digital bus switch IC's. It seems a 10-digit one like this would work, leaving one unused. http://www.digikey.com/product-detail/en/74CBTLV3861PW,118/568-8418-1-ND/2765135 My question: is this the easiest solution? I simply don't know what all options exist, so any advice from someone more experienced would be greatly appreciated. Thank you for your time. -Caleb

Topic by calebpaul   |  last reply


Gameboy Screen

Hi I was wondering if it were possible to replace a standard gameboy advance sp screen with a newer, larger screen and how I would go about doing something like that. Thanks!

Topic by greydon   |  last reply


DIY Small Image Projector PLEASE HELP!!

Hi there, This site seems quite informative but still couldn't find what I am looking for, I really hope you can help me. I am actually trying to achieve the exact opposite of what most people try to do with their DIY projector builds. I am trying to make a "small image" projector. I have tried using all kinds of combinations of focal calculations but cant seem to get the result that I am looking for. I will be honest with you, I am very new to this and still acquainting myself with it. I want to build a projector that can project an image as small as 10mm across to as large as about 50mm - 70mm across without loss of image clarity. I also want to be able to project the image from a short distance, up to maybe 300mm away. I will use a 7" LCD (1280x800) and want to be able to build this projector no larger than an A4 size sheet of paper. is this achievable? if so, how would I go about building it? would you be able to give me any advice, ideas?   Any ideas are welcome as my head is about to explode :-(   Cheers Jon

Topic by jwindsor2   |  last reply


Surely there's an app...? (Software recommendations, please)

So, I have this new HP Sprout that I totally wasn't expecting. It's got a large touchscreen and this cool projector-scanner-touchmat combo that should be really useful for... something. The first thing I actively want is to be able to create files for my laser cutter (running Lasercut5.3), just by drawing with fingertips or stylus.  In my head, I see a version of Inkscape that works on the touchmat, but only responds to the stylus (to save weird lines from knuckles, elbows...).  I have Inkscape downloaded, but it won't work with the touchmat. Second, it would be nice to start learning how to create are actually 3d already, that could then become lasercut-able or 3d printable. Again, it would be nice to use the full potential of the machine, so what software would you recommend? Third... what?  have you got any cool ideas? On top of all this is the consideration of cost.  Free would be nice - if you are a software developer, I don't mind having a go with Beta products (I'm known for breaking code, so if it can survive me...).

Topic by Kiteman   |  last reply


HMC5883L with external magnet

GY-273 HMC5883L Compass A. I'm waiting for my chip to arrive and will attach it to a RasPi. B.  My question is: if I align my chip to "N" then rotate a magnet round the chip - i.e. a weathervane - thoughts on how that might work? C. Can my magnet, if too strong/close, damage my chip? Thanks

Topic by liderbug   |  last reply


RFID BLOCKING, MADE SIMPLE

I have seen RFID wallets, sleeves, and cards.  I like the IDEA of RFID blocking cards that you sandwich your credit cards between. So, my question is thus... If I had two cards made of 21 gauge aluminum and placed them on in the last pocket on both sides of my wallet, would this block the RFID scanners?  If not, then what would it take? What just programming some RFID chips and put them in my wallet to eff with the scanners?  I know there are things like this in the market, but very over priced.  I have contacts in the RFID scanning and deployment world, so it would not be hard for my to get my hands on this stuff. What do you all think!?

Topic by benjaminleebates   |  last reply


Advice for a buzzer element

Hello I am developing a small device which requires  a sound alarming. The idea of the device is to be attached to your phone for example and if you wonder where your phone is, the device will turn on the sound alarming in order to give you information for its location. So, I am searching for a buzzer element which: - consumes up to 3.6 V; - is small (diameter up to 20 - 25 mm) and thin of course; I decided to use a buzzer element similar to this one http://www.digikey.co.uk/product-detail/en/CEB-20D64/102-1126-ND/412385 but I am not sure if it will do the job. I am concerned about something else, I have a buzzer at home which produces sound of high frequency and when you close your eyes it is absolutely impossible to find out where the sound comes from. Can somebody help me, please? Thanks a lot!!!

Topic by paveltashev   |  last reply


peer to peer communication between Arduino Micros, serial? half-duplex?

Hello all, I have a few Arduino Micro units, and need to connect them together (in a mesh network) so that every unit in it is interchangeable, meaning that any unit may be in connection with more than one unit. As the Master/Slave form is out of question at this stage (because any given unit cannot be both Master and Slave at the same time, of course) I decided to go for a simple serial communication. However the Arduino Micro units (and frankly none of the Arduinos) do not have sufficient serial pins and I was advised to use Soft Serial instead. I was looking into the pin out of the Arduino Micro but cannot quite figure out which pins I can use for the serial comm.; I need 4 to 6 serial communications. If not Micro, what other Arduino (or any other solution) would you suggest? Each unit needs to have the following information ready at its serial ports: - its ID - its MAD - sensor value (analog or digital) Any help is much appreciated, as the nature of the problem may not be changed. So I need to solve it as it is. Karim.

Topic by karimskarim 


What to do with a bricked all-in-one pc?

I have a bricked Dell Studio 19 All-In-One PC, and wanted to know if I could use it for something. It was bricked by a failed BIOS update. There was a program from dell which came installed and updated any other of their software and drivers on the computer. Only after the failed update I found out that updating the BIOS is really unnecessary. The only fix I know for the motherboard is replacing it, and the only place I found out that refurbishes them are from a company in the US, and it's not cheap at all. (I used to live in the US, and moved to Brazil later) Well anyway, I wanted to know if I can use the computer for something else, like use the monitor for a different computer and use its bluetooth mouse and keyboard on a different computer too. I think the only thing really useful in it is the processor which is already old (Intel E7500 and a 320GB HDD). http://www.dell.com/us/dfh/p/studio-one-19/pd http://www.dell.com/support/home/us/en/04/product-support/product/studio-one-19/diagnose Thanks for the help!

Topic by nickfaraujo   |  last reply


A Good Electronic Project For a Beginner.

May I ask for something which is good and nice to create for a beginner like me. I don't really have an idea what to  make. I just hope you'll help me.

Topic by imatrianidar   |  last reply