PWM

The circuit diagram for your 250w to 5000w PWM DC/AC 220V Power Invertor is not very legible.Can you e-mail me a better copy?

Posted by AkhbarB 1 year ago


PWM to MPPT solar Charge Controller

I have an Hybrid Solar Inverter with 50A PWM solar charge controller inbuilt into it. It works on 24V battery bank. I am having 800Watt of PV module installed in the system. As my inverter is having PWM charge controller, I am not able to harvest maximum of power from panels. I want to know that, is there any arrangement or device which can be put in between PV panel and my Inverter which can increase efficiency or can act as PWM to MPPT converter for my Inverter? My Solar Pannels generates often 39V but I couldnt utilize the surplus power as it stepped down to 24 Volt.

Posted by Shashi BhushanS 3 years ago


PWM fade

I am using micro controller in a project that has a set of functions (API) that can be used for a plethora of things.. (just up to you to program it that way) LOLIt has a PWM control... which i am trying to use to FADE in (and out eventually) a high powered LED (LUX III to be specific).. the problem I having is that at a certain point (say at 50-60%) of full brightness I see a VISUAL jump in brightness.. Im trying to get it to be smooth the whole way through to 100%more or less the code is like:PWM = PWM+2which I then wait 10 mSecs and loop it again...I have tried to put in some conditional checking to check to see if the current level of PWM is at a certain threshold..and then only loop it again after a longer delay (say 300mSecs) or something..I tried to search.. ut Im not sure on how to get a CONSISTANTLY smooth fade...ot smooth to say 50-60%..then a visual jump in brightness and then smooth to 100%..any ideas or links on the subject are appreciated.Thanks

Posted by xl97 9 years ago


What to do with a UC3842B (HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER)

I have dismantled a CRT monitor and I was wondering what I should with a UC3842B (HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER) that was on the mains power side of the PCB.Here's a link to the datasheet for it.Any suggestions on what I should use it for and how to wire it up?

Posted by thermoelectric 10 years ago


Time constants of batteries ?

Hi,I'm trying to figure out the way solar battery charger work and I'm a bit confused about the following point.I read that for batteries you could consider the PWM voltage to be equivalent to DC. This I understand well for average voltage (obviously it's the same), but what about the dynamics ?If your PWM frequency is something like 100 kHz, that's a 10 µs period. Does the battery has time to follow and make big voltage and current peaks or does it just averages all that to more decent values ?One way to put it is : Are the battery time constants indeed much bigger than the PWM period ?Thanks for any idea on that topic !

Posted by Emmanuel2015 7 weeks ago


Using arduino for Serial in/PWM control

Hello I am wondering if there is someone who can help out a super beginner.  I need to write a code that will allow me to type send a serial message to the micro (im using an arduino uno) to be able to set PWM port to a certain percentage thus changing the fade of an led. I would also like the program to echo back to me a text string indicating what has been done. Is there anyone who can help?

Posted by JonH23 3 years ago


DIY Design PWM Contoller for 3 HP 36VDC Motor

A friend of mine and myself want to build a couple of small electric utility vehicles to use for chores around my farm and his cabin. We are thinking of something along the lines of the eMule.  http://www.solarevolution.com/eMule/  We just bought 2 new 3HP 36VDC motors for a really great price off of eBay.  See pics. I want to build some PWM controllers for these to help keep the price of the project down and because I like building things. I could use some help though on a few things. How many amps should the controller be rated for? 100 amps? Larger? Are there any designs out there for a DIYer like me? Thanks.

Posted by starguywisc 4 years ago


rc project

I decided to go for the rc car. I'm using the 1/5 scale  maxstone trying to combine it with the raspberry pi. I'm also using adafruit's pwm. I know this might be old to others but it is new to me. I am a beginner and I am very excited about it!    I am open to any suggestions, comments, feedback, links, anything would be great!

Posted by SMILEY4242 1 year ago


Electronics Help

Hi ppl,I am currently making a variation on this circuit:http://www.edn.com/article/CA257052.htmlhttp://www.edn.com/contents/images/257052f1.pdfI understand how it all works but do not understand the principle of the inductor capacitor used (bottom left), if anyone could give a brief explanation of this (links are good too) and also some formulae i would b e very greatful!!thanks

Posted by drummer ian 10 years ago


How to connect 555 signal generator to Tesla coil or other High voltage application

Hi all, I hope everyone is well. I have 2 circuits here and was wondering if someone would show me how to connected them, it is probably very simple, but I just want to be sure. here are the 2 schematics I'll be working with... I assume I just use a common ground... but we all not what assuming makes us :)  Thanks all in advance, 

Posted by dalmond1 6 years ago


Using a hall effect sensor with TL494 pulse width modulator.

I have an electric billy cart with a dead controller board. I constructed the kit circuit below to replace the dead board and it works well enough for the job except for one small problem. The throttle on the billy cart utilizes a hall effect device and not a pot. The billy cart also has a handbrake with a switch that closes when applied. I use this with a resistor to discharge C2 and pull pin 4 (inhibit) high. This ensures a gentle start (as the capacitor slowly charges through the 100k resistor) if the brake is released with the throttle advanced. The output range of the throttle is 950 mV to 4.1 V if VREF (5V) is used as the supply. (I'm dropping it in in place of the pot.) 4.1 V is sufficient to achieve the maximum 90% duty cycle of the chip, but 950 mV leaves me with a minimum duty cycle of about 21%, and of course a motor that won't stop. Will changing the divider ratios 20k/2k2 & 47k/47k be sufficient to get me zero speed or am I going to have to do something more exotic? Thanks in advance.

Posted by Rasputin182 10 years ago


Arduino PWM and RGB LED strips

Hi.  So I bought an arduino uno, some IRL530NBPF, and 4,3m RGB LED strips. I want to control the strip with the arduino, but can anyone tell me how to hook it up?

Posted by sinding 8 years ago


arduino control of digital potentiometer

Is it possible to use my new Ardy board to control a 1-wire potentiometer that will, in turn, control the pwm output for a high-power LED?The POT is here. The lights are REBELS @ 700mA.THe POT will be run in "non-parasitic" layout.

Posted by Tweac-it 9 years ago


AVR sense/PWMing Help!

Hi again! I'm intent on finishing up a few loose end projects of mine, but before I do so, need the following information. How can I sense some resistance or voltage with my uC? I know I can do an a/d conversion, but that only triggers when Vin > some 1 preset value. I'm looking to make an adjustable knob to turn the intensity of an LED up and down. Also, how can I PWM some LEDs with my AVR uC - I can use the tiny2313 or mega8 or tiny 13, but I have no preference. I just need 3 different PWM channels. Any ideas? I already googled, but apparently I'm terrible at finding good tutorials. (oh, and I'm coding in C) The LEDs will be inserted into this nice, custom built (by myself) welded devil duckie. Horns and tail will turn to control RGB. Thanks a whole lot, -Muffin

Posted by T3h_Muffinator 10 years ago


Noise in Amp from LED Strip & servo

Hi, I am working on a project in which TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power transistor(TIP120), an LED strip taking 1A from the same 12V supply. There  1) Now the rapid switching of current for LED strip is messing up the amplifier output. It's working fine with LED Strip off but when using PWM, there is a high frequency noise in the amplifier output. I have a 0.1uF and 10uF caps near power inputs for both AVR and amplifier. This is probably due to insufficient decoupling. Can someone please help me make it better? 2) There is another independent source of noise I'm finding which I'm unable to explain. The audio is going into Arduino which is controlling a servo as well. As soon as the servo is connected, there is a constant loud noise in amplifier output. This remains even after powering the arduino and servo using seperate USB supply(only ground connected). I placed audio setup and servo data wire far apart since they may be interfering due to PWM used for servo, but it wasn't of any use. Since in both cases, amplifier is producing noise, I think my amplifier diagram might be at fault. If I remove the amplifier, the audio stream reaches arduino without any noise . Anybody got any ideas how to remove these 2 noises? Attached images: amplifier schematic, graph of audio input in Arduino analog pin. -Antzy

Posted by Antzy Carmasaic 5 years ago


*linear* PWM LED fade with arduino

Arduino comes with a simple program to make an LED fade on  or off, however, as far as I can tell, the apparent brightness of the LED does not change linearly with the wpm duty cycle. After some research I found that this is because humans percieve brightness logarithmicly, not linearly. (Also, LEDs don't change brightness linearly with current, but sisnce I'm using PWM, i don't think that comes in to effect.) I found a simple look-up table to correct for this on this page. 255, 180, 128, 90, 64, 45, 32, 23, 16, 12, 8, 6, 4, 3, 2, 1,0 This seems to work very well, but I don't know where this comes from. Does anyong know the ectual equation to get the % duty cycle from the %brightness? I like to abstractise things.

Posted by Vick Jr 8 years ago


DC motor speed controling

HI!  I'm trying to mod my Tascam cassette recorder. I want to be able control speed of the motor. So I bought on ebay PWM controller and after installation thing don't run so smooth as I wish. the problem is ... when pot is all the way down at 7 clock motor is off, when I turn it to 8 a clock motor starts spinning and reaches its full speed at 9 a clock. and from 9 a clock to 4 there is no effect on speed. Please help me! .... my electronic skills are too weak to understand this. p.s  it is 12v dc motor and there is link for the pwm I use.  http://www.ebay.co.uk/itm/111817741979?_trksid=p2057872.m2749.l2648&ssPageName;=STRK%3AMEBIDX%3AIT Thanks    

Posted by AndrisT1 2 years ago


Speed controlled industrial fan

Hi all, For an installation I need a speed controlled fan that I can control via a microcontroller. Is there any industrial fan that you know that allow to be controlled with eletrical signals rather than the usual manual control? thanks a lot!

Posted by amicoleo 2 years ago


How do you hook up a linear actuator to be controlled with PWM / R/C?

Hi Everybody, I'm working on a robotics project requiring strong linear actuators(LAs). For the most part I see that using LAs is the same as using DC motors. The red and black cables of the LA would connect to the motor +/- terminals of a motor controller. The main power source would connect to the battery +/- terminals of the motor controllers, and the motor controllers input could then come from a microcontroller or single board computer (SBC) using PWM / R/C control. This should allow me to control the direction and the speed of extension. However, for my application I and going to need multiple LAs the need to extend exactly in sync. The best way I can think to do that is to sense their individual extensions and program the LAs so that they stay in sync with each other. From what I've seen what I'm looking for are LAs with built-in limit switches and potentiometers.  What I don't know is how to hook these up to their motor controllers and microcontroller/SBC. An example I'm looking at is this one from Firgelli Automations: http://www.firgelliauto.com/product_info.php?cPath=94&products;_id=159. Unlike hobby servos this LA has 5 wires. Two are the positive and negative power wires and the other three relate to the potentiometer. I know you can control the extension this way but so far I've only found youtube videos and couldn't see how they hooked everything up. This datasheet for different LA (http://www.firgelli.com/Uploads/L12_datasheet.pdf) helped me understand what the potentiometer wires do, but not how to use them with a PWM microcontroller. Does anybody have experience with this? Thanks for reading

Posted by honor_the_ways 6 years ago


how many servos can an arduino control?

Hey, im in need of a little bit of help with the arduino. im new to it and need to know how many servos an arduino can independently control as all the pages ive found seem to indicate 2 but i need 3 servos to run through a pre-programmed set of steps. please help. thanks

Posted by budsiskos 9 years ago


that I can do to convert 2 PWM inputs (rc servo) to 5Vdc analog?

Que puedo hacer para convertir 2 entradas PWM (servo rc) a analógica 5V?

Posted by racataca 4 years ago


PWM to Digital Signal

I am trying to make an R/C sumo bot for a competition. What would be the easiest way to run regular DC gearhead motors from a servo controller? I'm thinking of somehow converting the pwm signal into a digital signal that would run the motors forward or backward.

Posted by Stingray 7 years ago


control the speed of the ac fan by pic with PWM

Hello I would like to know how to control the speed of the ac fan by pic with PWM I used optoisolator to protect the pic but the circuit does not work well is the optoisolator doing his duty ? is this circut working properly ? please help me  

Posted by MohamadK4 1 year ago


Will a SSR work with a PWM signal?

Hey guys gotta quick question: I need to be able to cut a PWM signal from a motor for a project. I'm currently using mechanical relays but I'm curious, will a solid state relay work? I know there are easier ways to do this but for right now I'm on a clock and I just want to  know whether a SSR will work for cutting a PWM signal.  Thanks guys!

Posted by HavocRC 1 year ago


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.

Posted by nigho4real 3 years ago


robotic arm

I have added more updates this is a major update to the 5/6 axis robotic arm instructable. come check it out.

Posted by sparten11 6 years ago


Arduino noob, need help

Hey ive recently jumped into the wide world of arduino. well i only did because i required the easy way out of led fading using arduino programming however i wish to use the Basics>fade example but using all 6pwm outputs!! can anyone simply modify this for me :) cheers

Posted by Applecore807 8 years ago


Choosing IC

I recently came up with the brilliant idea (read: scheme) of constructing gloves with built in  RGB LEDs that fade through colors randomly. I plan to sell these to ravers as they are usually spoiled rich kids (no offense) and I can fund my new found interest in electronics. My question is if anyone knows of any ICs that can control this without having to program it, like the LM3914 can work as a VU meter. If no such thing exists, then the cheapest alternative.

Posted by wootwootman 8 years ago


Help me find a servo speed controller!

I'm motorizing my camera slider (https://vimeo.com/39175570) in order to use it for time-lapses. I'm using a gear motor, a 8ft circumference timing belt (for 4ft of motion), and a motor speed controller.  I am getting the parts from ServoCity.com and McMaster-Carr.  This is the motor I'm planning on using: http://www.servocity.com/html/10_rpm_precision_gear_motor.html And here is the speed controller I want to use: http://www.servocity.com/html/digital_manual_speed_controlle.html A video of it working: http://www.youtube.com/watch?v=R_t1V5MljvY Although that speed controller would work perfectly for what I'm doing, it's $80. Does anyone in this community know a cheaper place to find a similar device? From what I can tell it works like most speed controllers, by pulse-width modulation. Whatever that is. Here's kind of what I'm looking for: http://www.electronickits.com/kit/complete/motor/k166.htm. This may work fine, but it seems overbuilt for the purpose. Would it still work fine on a smaller motor like I'm going to use? Thanks for the help! -Jason

Posted by John Smith 6 years ago


Laser Engraving Under Glass.

Just put a video on Youtube about Laser Engraving under glass.A lot of people have made their own Laser Engravers using one method or another.I did the same using old DVD drive mechanism's a couple of Easydrivers an Arduino UNO and a 2 Watt Laser Diode and a Constant Current Laser Driver with TTL / PWM.Arduino has GRBL 1.1f loaded on to it and I use LaserGRBL (free program) to do the image settings, generate the GCode and burn the image.It's a good little machine, although the workpiece size is only 39mm x 39mm max.Eventually I'll build a bigger machine, but for now it does what I want it to do.Recently I removed the fan that blows the smoke away because it was whining a bit and getting on my nerves.So instead I tried using a piece of glass cut from an old flatbed scanner, on top of the workpiece.Seems to be good quality clear glass, I suppose it had to be if it was in a scanner.This stops the Laser from producing smoke and also soot.It does however produce a sticky residue on the back of the glass, but that can be cleaned off in soapy water.I was quite surprised at the results.Laser Engraving Under Glass.

Posted by StuartB44 2 months ago


dc- motor ultracapacitive skateboard

Need help in this project as I am abit lost with the programming of my project. My skateboard will be able to charge by manual moving and then discharge to electrically move the skateboard when needed. Im using an arduino board and I need to program a H-bridge with pwm and controlling the motor speed. Hope somebody can help me out asap. Thanks!!

Posted by Nicktyw 6 years ago


PIC16F870

Hi, friends could you send me full instruction set to program the PWM output of PIC16F870 so that it can be applied to switching mode power supply control.

Posted by switchmode 11 years ago


Arduino - Mega or Duemlianove

I have been thinking about getting an arduino from Adafruit Industries. They carry two - The arduino duemlianove with the Atmega328 and the more powerful Mega with atmega1280 chip. I am having difficulty choosing between the two microcontrollers. My main focus will be on larger projects like the Garduino(www.instructables.com/id/Garduino_Gardening_Arduino/) but again also on smaller robotics projects like advanced balancing robots(multiple accelerometers and sonar sensors)or even arduino smart drones(aircraft).Some of the factors in my descision will depend on: Price Weight Dimensions Power requirements Flash ROM Output pins Protoshield/other shield capabilities PWM control XBee wireless support Integration with logic systems Support for multiple(3) LCD screens/Dot Matrix displays Multiple Servo support Sound/Media support Please help me choosing this microcontroller.I will only buy once in maybe 4-5 years so I want it to be good buy. Also tell me which shields should I buy for my requirements: either the sound shield or the servo shield.I think I will buy the servo shield because it will give me greater control over my robotcs projects Kabir

Posted by mhkabir 8 years ago


Control DC Motor with a L298N H-Bridge with 24V

Hello everyone, I bought this module with a L298N H-Bridge inside: https://cdn3.bigcommerce.com/s-vt19phz/product_images/uploaded_images/l298n-motor-driver-from-tronixlabs-australia.png Now I want to control a 24V DC motor with an incoming PWM 488 Hz signal from an external converter. I don't want an arduino or something else to control it. Just from this pwm signal. How do I connect it? I use a 24V power supply.

Posted by julianpe 2 years ago


Lilypad RGB led pwm help

Hi everyone, I have started working with my new Lilypad Arduino and some RGB leds.  I have been loading code and testing 4 RGB leds (common anode) which I have set up in parallel across pins 11, 10, and 9.  While powering the lilypad by usb the leds cycle through all colours (which is what I programmed it to do).  Unfortunately, I have a problem when powering the lilypad by  this power supply. When powered by the power supply the only colour that lights up is red (pin 11).  Can anyone suggest anything? 

Posted by Br3ntg33k 8 years ago


Arduino controlling 10 RGB groups

Hi everyone! I recently came across the arduino board and I've been playing around with using Python to control the board. I would like to use my new toy to create an Ambilight like setup for my computer monitor. The python script I have created for this does quite a good job and runs at about 15-10 fps! I want to use 10 RGB groups of 3 leds each (3 top/bottom, 2 sides). Since the Arduino only has 6 PWM ports and that leaves me with 5 Digital out ports, I have to multiplex the system. Since I want to use all colors and not just the 7 combinations normal rgb controlled by on off gives me I designed a circuit that would make this possible. The refresh times on the PWM ports have me worries.. (changing to a new voltage) The PWM resistor-capacitor circuit is an option to fix this (I think), it would replace the resistor after the PWM in the diagram. My knowledge on the subject is a little rusty so I was wondering if someone here would like to look at my circuit design and comment on it. I'm using MOSFETS, NPN transistors, resistors and capacitors. My LED strips use 12 Volts (hence the mosfets). In a single setup the mosfets work like a charm! 12V goes to the anode of the led group and the mosfet drain goes to the cathode, which is labeled as LED in my diagram. Tnx Guys/(Girls?)!

Posted by AIex 8 years ago


Transistor question

Hey guys I have a question on transistors. When using for PWM setups, is the difference between each NPN (or PNP) transistor model by its specs? Such as gate voltage, max current, etc. I am making a LED touch setup made by qs, but I want to make it so that the Arduino activates a transistor to turn on a string of lights that the arduino could not power on its own. Here is the setup of the LED string. I want to replace the TIP31 in the wiring diagram with a NPN transistor (like this one). By replacing it, which pins go to which wire and do it have to add anything else to the setup? Will the new setup also work with PWM signals? Thanks! KT Gadget

Posted by KT Gadget 8 years ago


Mosfet Question

Hey guys, I am doing the arduino controlled rgb leds (1 watt leds) project and I am going to use mosfets for the leds. I ordered 3 IRF540 mosfets, 1 for each color of leds (Red, Green, Blue). the arduino is going to use pwm to control the leds but the arduino can only supply 5V at 40mA max. The mosfet have gate-source voltage of +/- 20V and a gate-threshold voltage of 2.0V to 4.0V. Do i need a driver circuit between the arduino and the mosfets and if not is 5V sufficient to run the mosfets in pwm? If i do need a drive circuit, does someone have a schematic since i am inexperienced at electronics? Would i need a heatsinks for the mosfets? thankx for any insight...

Posted by Slisgrinder 9 years ago


How to Embed Youtube Video

Not sure what I am doing wrong. I have embedded videos before but I posted a few new Instructables today and can't seem to get Youtube videos to embed. I tried the techniques on this page. https://www.instructables.com/id/How-to-embed-a-video-into-Instructables/?&sort;=NEWEST&limit;=40 I also tried clicking the embed video icon and pasting the Youtube embed code into the box. It shows a flash box but when previewed (and published) there is no embedded video. For example, this step should have a video embedded. https://www.instructables.com/id/PWM-Fan-Controller/step2/PWM-Fan-Controller-LM35-Sensor-Overview/ I am sure I am missing something simple, I am just not sure what it is...

Posted by abbtech 8 years ago


arduino Questions

Silly question. Trying to build something that requires an arduino to take a temperature measurement, and pwm an Item dependant on that temp reading. so the question is how many reads and adjustments per second can I aim for? I was hoping to get the 1 MHz area but am assuming less than that at this time

Posted by plucas1 1 year ago


help with dimming leds

I recently bought an rgb 12v led tape thats about 1 meter long and i want to attach it the bottom of my scooter. What would be the best way to put a dimmer on the leds? Do i need a PWM sort of a thing or can i just use a 100ohms pot?

Posted by shieldliger101 9 years ago


[HELP] Rapid Fire Mod For wireless mouse

Hi. I have followed this instructable HERE but i cant get it to work. My mouse is a logitech M310 1.5v I have purchased a LMC555CN that work with 1.5v but i will still not work.. any help will be appreciated :-)

Posted by cannafix 6 years ago


Announcing the Roboduino - the ultimate Arduino-compatible Microcontroller

The Roboduino is finally on sale!!!http://curiousinventor.com/images/kits/roboduino/roboduino.jpgIts $40 for a kit and $55 for an assembled version More info and sales information here: http://curiousinventor.com/kits/roboduino Features / Specs:100% Compatible with Arduino software.Power buses along side pwm and analog pins easily accept standard servo and sensor connectors.Powered can be supplied from USB, barrel plug or 3-pin male header. You'll need a suitable power supply when driving multiple servos.dedicated UART 3-pin male header6 PWM outputs with neighboring unregulated power pins6 analog pins14 digital pinsReverse polarity protection for board circuitry (not for unregulated power pins)Optional I2C pull-up resistor locations

Posted by Erobots 9 years ago


Using an ATtiny to control LED brightness?

Hey guys, I was wondering if any of you know how to control LED brightness using an AVR microcontroller. I'm using the ATtiny 2313... I was guessing that there is some way to do it using PWM, but I have no clue how to do so. Any help at all is appreciated! Thanks, -Muffinator

Posted by T3h_Muffinator 11 years ago


Choosing the right white LEDs for my dawn simulator

Hi all!I'm playing around with a simple DIY dawn simulator alarm clock. I've got a prototype thing working on a breadboard; an ATMEGA88 sends a PWM signal, which fades in a white LED. Adding more LEDs, I thought I'd better send the PWM signal through a mosfet, rather than drive the LEDs directly.Now I have 5 LEDs, which I grabbed in a pack at the local gadget store. However, looking at LED dawn simulators, it seems I'll need an 6x12 array of LEDs to actually wake someone up. Before I buy bulk online, I was hoping someone might help me choose the right components :)What I want is,white LEDsI guess large is better? what I have now is 10mmshould they be ultra-bright?Please comment :)

Posted by joakimk 9 years ago


Arduino with multiple RGB LEDs

Hi, I am pretty knew into the Arduino world. My problem is trying to make multiple RGB leds (https://www.banggood.com/10pcs-5mm-RGB-LED-Common-Cathode-4-Pin-Tri-Color-Emitting-Diodes-F5-p-937475.html?p=DQ30066511122014069J&utm_campaign=educ8stv&utm_content=huangwenjie) work with the Arduino. Although it would be be easy enough to use a single RGB led, I want to use multiple RGB leds. My RGB led uses 3 digital pins with pwm but since i am using an arduino pro micro with 5 pwm pins, I can only use 1 led. I have found that the max current per pin is 40ma but shouldn't exceed 20ma so therefore you couldn't put 2 leds. So my question is, how would i power more than 1 RGB led? Any help will be appreciated. Thanks!

Posted by Isaac Emery 1 year ago


programming help

First of all, I am new to this. But for my CEIS course project I decided to program an rc vehicle because I thought it would be COOL! Now I am knee deep into the project and I am needing guidance.  So I am going to attempt to stack raspberry pi hats. One adafruit pwm for servos and the other adafruit pwm for dc and stepper motors. The first thing I done wrong was solder the gpio headers on backwards. Since I'm not too professional with a soldering iron I ended up making the drives of no use and ordered more. Before I done that, I got my pi camera working! Still need to program the pan/tilt servos. I have battery power, wiring, almost everything as far as hardware. Just not sure if I am headed in the right direction. I tried different things with python and the i2c but now when I start up the Kernel Module fails.  Any help will be great!

Posted by SMILEY4242 1 year ago


Request: How to wire a Firgelli L16P to an arduino

Hi, everybody. If you followed my instructables you know I'm always building robots.  I'm trying to assemble a Stewart platform using Firgelli L16P linear actuators.  My problem is that I can't seem to get the Arduino PWM to talk to the firgelli RC servo interface.  I have... - 12v running to controller pins 1 (-) and 2 (+) - arduino PWM pin 3 to controller pin 3 - controller pin 1 to arduino GND (for common ground) and I'm running a version of the servo sweep example sketch, modified to run on pin 3. The actuator doesn't move. I've tested the control board with the PC control software from Firgelli (works) and I've tested the arduino with a TowerPro SG5010 I had lying around (also works). Notice the controller LED will NOT come on in this configuration, but once I remove the common ground the light turns on. So what am I missing?

Posted by aggrav8d 7 years ago


Simple circuit to turn robot chassis with DC motors into RC car?

I want to convert a robot chassis with two DC motors, like this one: https://www.sparkfun.com/products/10825 into a basic RC car. Ideally, I'm looking for an off-the-shelf solution consisting of a remote with two joysticks (for tank-style steering) and a paired breadboard-compatible receiver that outputs, for each channel, either (a) an analog voltage (say from 0-5V) or (b) a PWM signal (from 0-100% duty cycle). Those signals would be used to control the motors through two transistors. The closest thing I've got so far was recommended by a colleague - a paired remote control and receiver module: http://www.ebay.com/itm/Tactic-TTX403-4-Channel-2-4GHz-SLT-Mini-Radio-Transmitter-NEW-IN-BOX-TACJ2403-/231129030855 http://www.amain.com/product_info.php/cPath/61_3541_124/products_id/150442/n/Tactic-TR324-24GHz-3-Channel-Receiver However, that receiver outputs a PWM signal intended for servo control. My understanding of servo PWM signals is that they don't actually swing fully from 0-100% duty cycle, so that wouldn't necessarily work (i.e. if it only drops to 25% duty cycle, the robot would never actually come to a full stop). Any suggestions for a simple, off-the-shelf solution would be appreciated. I realize there are probably more complicated ways to do this (rip apart an old RC car and steal the circuitry, use an Arduino, etc), but this is for middle-school kids in an afterschool setting, so I need to minimize cost and complexity.

Posted by Ben Finio 4 years ago


Arduino Motor Shield Question

Hey, I'm looking to build an RC boat using an arduino uno and a motor shield. My motor shield power source is an 18v dewalt drill battery. I want to use this motor : http://www.hobbyking.com/hobbyking/store/__8595__2040SL_4800kv_Brushless_Inrunner_WaterCooled_.html but the max voltage is 11. How can I compensate for that? Could I just turn down the PWM? a resistor maybe? Thanks for the help, -Ian  

Posted by catdawg426 6 years ago