Topics


Coding trouble

Marc i made a rgb led matrix cube, i downloaded the charliecube code but can't get it to work, it has many different types of .h files, when i try to compile code it gives me, (whichever .h file) an error of, " ---.h file, no such file or directory,,, I've tried downloading many.h file readers I've tried downloading all the files themselves, I've tried rearranging them in my Arduino file, i just cant get it to work, what am i doing wrong or missing? how do i get my IDE to find the file or directory? also if i can't get this one to work i'll build yours, but can i build yours with common cathode rgb's? sorry, i started this one b4 i found yours,

Question by Bluestreekcustoms    |  last reply


How can I use a button to control a loop within a specific time limit?

Hello everyone,in my code below I have a button that initiates several actions. Initially it is set to LOW and when the button is HIGH several actions occur. I would like to add a time limit of 3 seconds so if the button stays LOW after that a different set of actions will occur. I tried using the if/else functions. Any suggestions will be appreciated!Thanks!Thomas. #include Servo s2; int BUTTON = 2; int COUNT = 1; int buzzerPin = 8; int counter;void setup() { Serial.begin(9600); pinMode(10, INPUT); pinMode(13, OUTPUT); pinMode(12, OUTPUT); s2.attach(5); } void loop() { unsigned long start_time; unsigned long stop_time; s2.write(6); if (Serial.available() > 0) { char data = Serial.read(); // reading the data received from the bluetooth module switch (data) { { case '1': start_time = millis(); Serial.println(" "); Serial.println(" Go...Go.. "); for (counter = 0; counter < 3; ++counter) { switch (COUNT); int servo = random(5); while (digitalRead(BUTTON) == LOW) { digitalWrite(13, HIGH); digitalWrite(12, LOW); s2.write(90); delay(10); } if (digitalRead(BUTTON) == HIGH) { Serial.write ("*S"); tone(buzzerPin, 600); delay(50); noTone(buzzerPin); digitalWrite(13, LOW); digitalWrite(12, HIGH); s2.write(6); delay(600); COUNT ++; Serial.print("You hit "); Serial.println(COUNT); } } } Serial.println(" "); Serial.println(" Finished: "); Serial.println("Your result is: "); Serial.print(COUNT); Serial.print(" Target in "); stop_time = millis(); Serial.print(stop_time - start_time); Serial.println(" Time"); Serial.println(" "); if (COUNT > 0) { COUNT = 0; } } } }

Question by tomstell1111    |  last reply


How do you repair the light sensor on a solar light that won't turn off in the daylight? Answered

I have one solar light that will not turn off in the daylight. There doesn't appear to be anything obstructing the sensor. The rechargeable batteries are being completely drained and will not recharge when in this particular light. I can recharge the batteries using a battery charger.

Question    |  last reply


Don't keep rats as pet !

When my brother decided to travel around the country, he has been forced to leave the white rat he kept as pet ... and I've been forced to adopt this little animal.Rats as pets quickly become cute, funny, and show a personality that make them even more endearing ... In other words, "la souris" (the mouse), as I renamed it because I was unable to remember the name my bro gave her formerly, quickly found her place in my home and my life.So, happy end ??No !No, because rats pets quickly develop lot of weird diseases :- dermatitis - mange- bumble feet- cysts- tumors- etc- and various infections and self-injuries because the rat scratches or bites itself because of one or several of the above diseases.The health and the life of your rat will quickly become a nightmare, and, if like me, you tend to consider your pets like full members of your family, your rat pet will become a great source of worries ... and if you're not cruel, you'll be forced to give an end to its agony. Because that's a real slow and cruel agony.Most people who adopt a rat as pet seems not to be aware of all the problems this little animal will have, neither how expensive it will be to look after it.The internet is full of sites dedicated to the diseases of rats pet. My advice : If you love pets, don't adopt or give a rat as pet !20080225 update :Despite what I said, if you still want to adopt a rat, then, you should better document yourself a lot before commitment.Member Please wrote a tiny instructable about How to take care of a rat the right way. She is a breeder, so you could ask her as much questions as you need.20080226 update :She also wrote two other very useful articles :avoid bad diseases for your pet ratfun games for your pet rat

Topic by chooseausername    |  last reply


Tattoo yourself with a pin and pigmented acrylic ink? Answered

I am wondering if you can tattoo yourself with a sterilized sewing pin and pigmented acrylic dip pen ink. Is the ink ok for tattoos? How for does the needle need to go?

Question by josh1324    |  last reply


Looking for a Fun Creative Project for Adults with Little to No Experience

I run a non profit teaching kids computer science concepts. As a fund raiser idea I was considering hosting an adult class at our local makerspace. I am looking for a kind of nerdy, somewhat inexpensive projects that adults will enjoy making as well as displaying in their home or office. With kids we do coding, make games, light LEDs with arduinos, make Raspeberry Pi cameras, and play around with paper circuits and homemade hex bugs. Does anyone have any adult ideas that may be fun? (Also, we are considering having a local brewery bring beer) I am open for more kids projects too, if you have any.

Topic by jkahle    |  last reply


Using aviation connectors instead of db-style connectors

Hello,I'm working on an arduino build that calls for a db9 connector, but cutting a nice, clean hole in a small, plastic project box for a db9 connector is difficult and messy. I would like to substitute a round connector so I can just drill a hole, and I came across "Aviation connectors." Would these be a decent replacement for db connectors? If so, why aren't they used more often? Is there some disadvantage when carrying a small (3.3v or 5v) DC signal? They are often rated for something like AC 200V 5A, which is total overkill, but would it be a problem?Here's what I'm looking at on Amazon: Hilitchi 32-Pieces 6 7 8 9 10 Pin 16mm Thread Male Female Panel Metal Aviation Wire Connector Plug Assortment KitIf this will work as well as the db9, I wouldn't mind buying the whole kit and having some round-hole options for other projects.Google searches have not been very helpful, and tend to give a lot of results for one or the other type of connector.Thanks in advance for any guidance!

Question by jeremy10    |  last reply


Problem Isis simulation

Please, friend, I tried much time to get a good duty cycle under isis proteus, but no solutions.if someone has an idea please share it with me.you can find in my post the screenshut of my code and what i get when i simulate under isis proteus.

Question by hicham01  


Help with some functions with arduino and ds18b20. Ello every

Hello folks, im having some troubles to control some rellays based on the temperature read of one ds18b20. The sensor stay under water, and when the water temperature is higher than 44°C the rellay turns off, but the rellay must be off until the water temperature fall to 38°C. I have no ideia of how to code it, some one can help me?

Question by scyklon  


HELP: Measuring power density from cellphone tower.

I am working on a project to measure the power density from cell tower. Most projects I saw involve expensive antenna and also a spectrum analyser which is too costly. I came across showing ppl fabricating a target single band microstrip passing through a RF Detector circuit. I think chip like AD8318 could handle it?? But how am I gonna filter if were to use an antenna with range of 200MHz to 2GHz eg. (https://www.sparkfun.com/products/8347) to measure a specific GSM band like 900/1800 MHz from the cell tower? I need help on the filtering and RF detector circuit part!!The closest resemblance to my proposed system: https://www.favoriot.com/category/how-to/

Topic by StudD    |  last reply


Control Amperage

Hiyas, I was wondering if you could point me in the right direction. I was wanting to build or buy something I could control Amp input. The system would be 12 -14 v dc and I want to be able to limit the input to say... 25 - 30 amps. So if a system would naturally draw more amps I want to be able to control the system be limiting the amp input...if that is making any sense. Got any thoughts ??? tks Huchleberry

Topic by huchleberry    |  last reply


Need help making pop up speakers

So im trying to make a pair of popup speakers for my desk. I dont even mind it being pop up empty rectangular boxes (platforms) in which i can put in some portable Bluetooth speakers. I have attached a picture of a popup socket. Im not sure how it works though. I know you can use linear actuators but im not sure that will work or maybe i havent found the right ones. please if someone could help me

Topic by mmathavan    |  last reply


HOW TO CHANGE THE SOUND OF MY SCOOTER LIKE A SUPERBIKE

IS IT POSSIBLE TO MAKE MY SCOOTER SOUND LIKE A SUPERBIKE? CAUSE IT WOULD REALLY AMAZE EVERYONE IN MY PLACE. CAN SHED SOME INSIGHTS IN THIS MATTER?

Question by PITVIPEROO7    |  last reply


I can't figure out a phone key matrix

Hello everyone,I'm Anthony and I'm a game designer / game master in an escape game, here in France. I work on Arduino most of the time and I generaly don't reuse electronics of other systems in order to modify it. But now I have to modify a phone to integrate some custom functionnalities.I followed a tutorial on this website to find out how to get a key matrix of the phone circuit (link to the tutorial)I'm quite a beginner to electronics and i admit that the key matrix I'm in front of looks really complicated. It has 9 wires soldered on it, but I can determine how much groups of keys it gets. I tried to use a multimeter with the continuity function but nothing happened. Do you have any tips for me in order to find it out ?Also, the small black lines that cross the circuit's wires are conductive but I have no idea of what the big black dot (on top of the circuit) is... It's hidding the paths so I can't see where the wires go.

Question by AnthonyF130    |  last reply


SDR antenna - 50 or 75Ohm cable?

Once you get going with your new SDR dongle you soon realise that it is little fun with the supplied antenna - if it came with one...Local stations, police (unencrypted) and so on is all fine with the short antennas.But if you want to get weaker stations or even track some satellites you are as lost as trying to get anything in the 160m band on your screen.Obvious way out is to get an external antenna.Depending on your needs and layout at home you might be lucky to find a ready to go option at some cost.In most cases though you will need more than the 3-5m that come with the usual antennas for car use.And not all base station antennas come with enough cable - keep in mind that hieght above ground and no obstructions close by count...With RG58 cable already being quite expensive a lot people consider the cheap 75Ohm TV cable as an alternative...Can we use 75Ohm antenna cable for our SDR needs?Of course we can!We only need to make sure that at the antenna end AND the receiver end the cable acts and appears like a 50Ohm cable.Especially if you need a really long cable in range of over 20m the TV cable shines with less loss that can't be ignored.Let me try to explain it the simple way first:You TV needs 75Ohm but the good old dipole antenna provides 300Ohm.The so called BALUN that connects the actual antenna with cable matches the antenna to the required 75Ohm impedance for the cable and TV.Like the TV, we don't transmit anything, so we don't have to care about what happens if power would go to the antenna - it is not a radio in the common sense, we just listen ;)There are many options available to match any impedance to any other but in our case a lenght of coax pairs is all that is needed.1/12 of the wavelength for the 75 and 50Ohm cable and we have a match.But.....You are right this simple option does not really work if you want to listen to a lot of different frequencies.What works fine for the TV also works fine on both ends!I assume you use an antenna for the common 50Ohm system and a standard 50Ohm SDR module or receiver.Two simple transformers will do the trick just fine and allow us to use cheap 75Ohm TV cable.The one on the antenna end provides 50Ohm for the antenna and 75Ohm for the cable.For the receiver the transformer is the same type but connected in reverse.You can look up how to make one with a simple ferrite torioid core and wire or coax but also order them from your favourite Chinese seller in the usual online markets.Add an antenna switch and you can use multiple antennas optimised for the frequency in question with dirt cheap TV cable.Just make sure to put the balun in a metal enclosure that is connected to the braid of the coax on both ends.

Topic by Downunder35m  


Can alternator create electricity IF yes can it generate 230 v and what size alternator would be required?

Can a alternator create electricity IF yes can it generate 230 v and what size alternator would be required? Would it be advisable to connect a transformer between a alternator and a battery?

Question by pvan heerden    |  last reply


"Let's Make" search no longer works for me?

Lately the "Let's Make" search option at the top right of the Instructable page no longer works for me.Any suggestions?

Question by Peterhead    |  last reply


Help! -I need a timed cigarette dispenser - seriously

Have tried everything to give up smoking and failed, so a neighbor offered to give me 1 cigarette every 4 hours so I can cut back. Now she is going out of town and I really need a machine to do this job. Can anyone come up with a relatively inexpensive machine that can be built by an amateur like me? I would be grateful for any help.

Topic by diane4m    |  last reply


Pedal Power LED lit night soccer!

Hello,My school entered into a "pedal power video" competition, the challenge was to make a video showing how to use alternative sources of energy, so my school had a soccer game at night where we lit the field up using pedal power and generators. This was done by attaching a belt to the back wheel of a bike and hooking it up to a treadmill motor working in reverse for power. Enjoy!thanksiosman

Topic by iosman123    |  last reply


Headphone started Peeling, any ideas? Answered

I have a SONY MDR-ZX600 Headphone which started peeling off at the ear pad and head rest area. I called the service and they wudnt replace it and i dunt want to buy new ones 'cause i wud face the same prob later. Is ther any idea to fix this and make it aestheticly pleasing?  Thanks!

Question by Kaushik LS    |  last reply


Principles of Laser cutting

I have being repairing all forms of cutting & welding machines for some years. In my experience for example Plasma cutters work on a principle of momentous arc. This is formed by a High frequency arc it only gives you 30 milliseconds to start your current flow. Air is required to force this arc out of the plasma cutting head. Ok got your attention now getting back to a laser cutter it also uses air to force out cutting light to cut or engrave. so looking for more under standing to work on a problem.

Topic by Keith MichaelD    |  last reply


Q: can i power a (9v-battery) multitester with 8 or 10v?

Hi, i´m living in a mountain-cabin with a small solar-kit (12v battery, 6 x 2v cells).i want to buy some multi-tester (which normally uses a 9v battery).i hate to buy batteries (and not just becauce i am a cheap fukc - might actually cost about a bit less than the tester itself, go figure, beauty/beast of capitalism)since i got anything from 2-4-6-8-10-12v here (for free - thank you sun): can i run the tester with 1 volt more or less? (or does all hell break loose .. which i´m actually kinda fond of)bowing

Topic by la xerra    |  last reply


leg and arm weights

Will someone write up the plans for a HEAVY-DUTY ankle and wrist weight. I have been searching online for a company that will make custom weighted wrist and ankle weights but there aren't any. I'm wanting to make a 50 lb for the arms and 100 lb for the legs. I'm thinking along the lines of several iron or lead bars strapped together with a nylon fiber or other strong material. I've only ever done projects in high-school, where materials were provided, so I don't really know where to get the materials needed. Please help.

Topic by dhill16    |  last reply



Can't publish a collection?

Hi all,I'm trying to publish a few collections in the teachers section that I have as draft in my account and every time I get the "oops something went wrong" error. I have really no idea where to start. Anyone having the same problem?Rolf

Question by Rolf Hut    |  last reply


Nordic Gold Answered

I'm planning on making a ring out of a coin. I'll use Euro coins. 1, 2 e 5 Eurocent coins are made of copper covered steel and are too small, so I think they won't be a good choice. 1 and 2 Euro coins are the right size, but it seems that they are made of alloys containing nickel, that may cause allergy. So I think I'll use a 50 Eurocent coin, that is made of Nordic Gold, an alloy (89% copper, 5% aluminium, 5% zinc, and 1% tin). Has anyone ever made a ring out of Nordic Gold? Did it cause allergy or stain your finger?   Did it tarnish? Is it malleable? Thanks

Question by Fabio M    |  last reply


What animal eats the body and leaves the head and feet? Answered

This morning there was the remains of a rat in my yard, The head, gallbladder, and 3 feet were in a little pile and the body had apparently been eaten.  Anyone know what animal does this?  I live in Fort Worth, Texas and we have rats, crows, possums, raccoons, coyotes, domestic cats, snakes, and mink in our area.  I know of several predators that will eat the heads and leave the bodies, but this one has me stumped.

Question by CatTrampoline    |  last reply


what to do with a 50,000 volt Tesla coil?!

I just got a 50,000 volt Tesla coil (Oudin coil) for Christmas. I dont have a clue what i could use it for, i need inspiration. My uncle likes to surprise me with semi random things so other than shocking metal tables i just dont know what to do with it. ---from teachersource.com (where he ordered it)While more accurately called an Oudin Coil, these are commonly referred to as a hand-held "Tesla Coil." This coil is self-contained in a heavy duty Bakelite case which forms a convenient handle. The spark is adjustable from 10,000 to 50,000 volts at frequencies of approximately 1/2 megahertz. The high frequency spark produced is about 1" long and can be used for a wide array of applications. An instrument like this is intended for intermittent use only and must be turned off after 10 minutes of use. The electrode furnished is approximately 2" long and the instrument is furnished with an intensity adjusting knob. For 115v, 50/60 Hz. An improved SAFETY FEATURE is the ON/OFF momentary switch which is in the handle. This makes our Oudin Coil extra safe for classroom use. (Runs on standard North American line current, 110 volts 60 Hz)

Topic by i make shooting things    |  last reply


Drawing schematics? Answered

This is Mousey the Junkbot's schematic...does he even have a third wheel? I would be very much obliged to anybody who can anybody draw this schematic out:

Question by blinkyblinky    |  last reply


household bottles to hold gasoline? Answered

I need a sealable bottole that i kind find around my house,water bottle,detergent bottle,etc that can safely hold gas for about a day

Question by mman1506    |  last reply


Changing the main image in an instructable you have published/ submitted to contest

Hi all, I'm having trouble changing the main image on an instructable I published a month ago. Does anyone know how? Could you provide the path? Thank you!

Question by Peakingduck    |  last reply


is their a repair manual for KIA Sportage for free?

Id like to try and repair my car myself for the crises nowadays is rampart if any body can give a site or whatever to help me avail this manual. this badly needed in my behalf thanks a lot

Question by jovenhatsjr    |  last reply


Suggestions for this post

Hello, i recently posted this instructable, please suggest tips to get better at this post since it wasn't featured and how to avoid those mistakes in future,thank you!

Topic by MissionCritical    |  last reply


Phase 2 Clone Trooper Helmet Pepakura

So i found a pdo file for the phase 2 clone trooper pep. But i have not been able to find a pdf version of the file so that i can craft it with my niece and nephew... CAN ANYBODY HELP? I don't want to let them down

Question by mindfreak66692  


Does Plaster of Paris shrink? Answered

Does Plaster of Paris shrink as it dries? I would like to make a mask out of it but I don't wan't it to shrink and crack. Gratias agimus tibi, josh1324

Question by josh1324    |  last reply


Momentary circuit help

Hi, I need some help with making a circuit. I'm new here and dont have much experience with electronic components. I need a 12v circuit that whenever it receives power it waits 3 seconds then grounds the load in the circuit for 1 second. Then stays off until power is removed. It must reset every time it gets power. Any help is greatly appreciated! Thank you!

Question by ortegadrian222    |  last reply


Not able to open drafts.

Hi Team,I am unable to open drafts. Clicking on profile pic, its shows drafts, but nothing gets showed up once I click on it.Please help resolving this.Regards,Vineet

Topic by IoT Cloud Guru    |  last reply


Ever heard of Ceramicrete, MgO cement, Magnesium cement

Has anyone ever worked with MgO cement?  Where can buy it in US? MgO replaces the Ca found in portland cement. MgO cement makes a concrete that will incorporate cellulose and other organics into the crystalline structure. absorbs CO2 instead of generating it, is an order of magnitude stronger than portland, does not require wetting, and cures in minutes. So basically, you can take some burlap or old blanket and paint this stuff on, then fill the void with straw and cement and make super strong, light and thin structures. I have looked for it locally but it does not seem to be available to consumers in the US, probably because of the lack of sheep crap which is the typical source of Mg. It is amazing stuff. This is pretty much the only article I could find about the stuff: http://greenhomebuilding.com/articles/ceramicrete.htm

Topic by bsims1    |  last reply


How to Reset and Refill Cat Genie Smart Cartridge?

How to Reset and Refill Cat Genie Smart Cartridge?

Question by bunis    |  last reply


64 w solar panel without a charge controller or battries but using a buck converter for direct regulated power?possible?

Greetings and thanks in advance for all the help. i shall start with explaining the situation.  i am going to be in the remote himalayas for about 2 months with a expedition team and for all our charging needs  we are going to carry a few solar panels, most of them are small 5-15 watt ones . the problem comes in when i introduced the 64 w thin film roll able panel. the specifications for the panel are as follows Model PVL-64 Rated Power 64 (Watts) Rated Voltage 16.5 (Vmp) Rated Current 3.9 (Imp) Open Circuit Voltage 23.8 (Voc) Short Circuit Current 4.8 (Isc) i intend  to use 3 LM2596 ebay buck converters to get 12 volts and 2 5V USB Output Converter DC 7V-24V To 5V 3A Step-Down Buck KIS3R33S Module KIS-3R33S for usb power. All of these will have a common source of power (the solar panel) and have separate outputs as i need to charge multiple things at once.  will this setup work or i need to think of something else.?

Question by 1st rover    |  last reply


Methods for Powering 8 LEDs?

Hey Guys - My daughter has a small Little Tikes car which I'm adding 8 LEDs (3 per headlight & 1 per taillight) to. Each LED is a 2v 20ma. I've already started, but hit a snag. For testing the LEDs, I used a 9v battery with a 330ohm resistor on positive. This lit individual LEDs as well as 3 LEDs in parallel. My plan was to wire them all in sequentially then figure out what was needed resistor wise when done - bad decision. I have almost everything installed except power and now stuck as to what do do. Having 8 LEDs which are 2V / 20ma, exceeds the voltage a 9V battery can produce. Afraid to try connecting the 8 directly to 9V as don't want to risk burning them out. Just wanted to post to see what my best option would be - especially one where I wouldn't have to rewire everything again in parallel if at all possible. Thanks!

Topic by bzowk    |  last reply


Digital control analog synth?

Hi all! I have an idea buzzing round my head and I could really do with some guidance. I'd like to implement digital control over an analog synth so I could have presets saved on a microcontroller. The synth in question is Serge modular. All the info on various modules can be found on the link below. Ultimately I'd like to be able to save and recall knob and switch settings, not patching. I would like this to be at the highest resolution possible, so no MIDI. Ideally 16 or 14 bit resolution. I'm a beginner in this, although I do know how to solder, but I don't have the underlying technical knowledge. So, how doable is this? What do I need to consider? Has anyone done something similar? Thanks! https://www.cgs.synth.net

Question by Dierge    |  last reply


Embedding Images?

Can anyone direct me to a resource on how I might be able to embed images in the text portion of an instructable instead of the standard way of just attaching them to a step by dragging amd dropping to the top of each step? I'd very interested in how the great mikeasaurus has been doing his Instructables recently. As an example check out this one https://www.instructables.com/id/Name-Puzzle/ That format just looks so much better for certain projects and if he can do it there must be a way.

Topic by TeacherMike    |  last reply


How can I use my cordless drill on this old drill stand?

I got this at a garage sale but my Ryobi cordless drill does not fit properly into the holder/slot, it takes an old sears craftsman drill. Any ideas on how I can get it to work? Thanks.

Question by hmunster123    |  last reply


how can i make a laser induced plasma channel for an electro laser?

To shock something far away without direct contact.

Question by mikmkt93    |  last reply


Solar charging

Hi, pls suggest me for the following A 20Watt ( 20V , 1000 ma) solar panel is connected to charge a 12V, 80AH battery . What is the value and wattage of a Current limiting resistor to be added?

Topic by khhrao    |  last reply


Audio mixer phones vs main out settings

My friend and I have started podcasting, and I am learning as I go. One this we want to do is commentary tracks. Our current setup works but I want to move to an audio mixer and connect the main out to my behringer UC222. For this we need to hear ourselves and the movie audio via the headphones but only capture the mics on the main out. Can I make this happen by running the movie audio line as PFL with the fader(slider) at 0?

Question by Sparkytastic  


SDR - Software Defined Radio, are you hooked?

Using a cheap USB dongle and an antenna everyone can listen to broadcasts.This includes HAM radio, VHF, UHF, DAB, data servives, satellite communications and even the ISS.Pagers can be listed too if you still find someone using them but getting the latest weather might be nice as well.What are you listening to, what data do you decode?What is you best story in regards to your SDR experience?Prefered programs?

Question by Downunder35m  


What Code Should I use To Make a Single Pulse Trigger.

Hello World,I am currently making a circuit that will produce a single pulse using Arduino. I want that my circuit and code should produce a single pulse, after that the pin o which I am taking output becomes low until I switch off the button. the pulse should again be generated when the button is pressed.I have been using a series of codes. But, whenever I upload the sketch to the Arduino it works for once. after that when I switch the button off and turn it on again it doesn't work. If the switch is kept on after some time it again starts to generate a pulse.Please if anyone can help me out would be a great thing.Thankyou.

Question by shubhamnagla909    |  last reply


What is that wire they use in pop up tents and where can I get it? Answered

 I was wondering, I'm making a halloween costume, And I want to know  where you can get that wire they use in pop up tents and foldable frisbees

Question by guitarmonk15    |  last reply