Search for Micro LED in Topics

Quad Copter LED Controller? Answered

I have four different colored flexible LED strips on the bottom of my copter.  Presently, my only option is on or off.  I would like to make them flash or do something different.  On each LED strip there are 9 lights and also resistors.  These are the type of led strips that can be cut if necessary.  I know I could go and buy a micro controller but I'd like to try and make something if it's simple and not to expensive.  The power will come from onboard lipo battery.  Any thoughts or suggestions are greatly appreciated. Thanks in advance, Darrel

Question by dsaper    |  last reply

SMD Led's

I have just purchased SMD LED's from China. They come on a strip. How do I remove them from the strip to use them individually?

Topic by epf321    |  last reply

How to start with AT89S52 MC?

I am new to embedded systems of 8051. i coded At89s52 and dumped my code for blinking LED. when i trying to get out put from a bread board no result dont know where i m doing wrong i m sure with connection fittings and circuit exactly matches with what ever available in internet. i have doubt on my crystal and 22pf capacitors and how to check them...?   can any one help me on this ..

Question by Vijaykum_ar    |  last reply

Micro Invisible fence transmitter

I am looking to have a Micro transmitter for an invisible fence made. This will need to trigger the invisible fence shock collar when it gets within 2 feet. I have a dog with a shock collar that attacks a smaller, older dog in the house. I want a transmitter that will fit on the collar of the smaller dog, run off of batteries with a LED to show it is powered on. I have an extra receiver to test with, and i can send photos of the transmitter and what information i have. Willing to pay COD for delivery.

Topic by GGryphon    |  last reply

sensors microcontrollers

Hiya guys is there anyone that can guide me to finding an instructable that deals with interaction in remote places using a micro-controller. For instance people in 2 different locations in the world, want to engage or enhance social bond or interaction by using a motion or proximity sensor and internet of things for instance triggering a sound or an led light that can be sensed in a remote location. So one location motion is detected and the other location this detection can also be seen, if that makes sense? For instance similar to this kind of project Could this be done? Thanks

Topic by Snowcoat    |  last reply

Connecting two LEDS to a button without Micro controller or PIC? Is that possible?

I am making a card that will include two LEDs on the front. Simple greeting card and nothing fancy because of time constraints. Is there a way to include a button without a micro controller or PIC? Since it is a card including those things may be bulky. Any ideas? Thanks!

Question by wolfsheim_lvr1    |  last reply

How can i receive two different signals from IR leds, would i need to change the voltage of the reciever also? Answered

I need help on making a program for a stamp preprocessor with two if the els statements for two different IR leds.?

Question by LucasOchoa    |  last reply

Dremel Micro Repair/Reuse

Recently at the end of 2016, I acquired a Dremel Micro cordless rotary tool from a garage sale/yard sale for about $20. I used it maybe 3 - 4 times until it didn't want to hold a charge for long. Basically when I put it on the charger, the LEDs scroll top/down indicating it is charging but after a minute or two they stop their normal scrolling sequence and they all stay lit up, which isn't even mentioned of in the manual. The fuel gauge battery indicator shows up red meaning it's near its battery life. At this point, I'm considering either to salvage the motor or buy a new battery for the dremel (which are 2 Sanyo 14650 batteries that are soldered onto a circuit board inside). I'm just wondering is there something that I have failed to do that would make the dremel not hold a charge? Thanks in advance!

Topic by TXVisual    |  last reply

Windbelt, Cheap Generator Alternative, Set to Power Third World

Working in Haiti, Shawn Frayne, a 28-year-old inventor based in Mountain View, Calif., saw the need for small-scale wind power to juice LED lamps and radios in the homes of the poor. Conventional wind turbines don't scale down well -- there's too much friction in the gearbox and other components. "With rotary power, there's nothing out there that generates under 50 watts," Frayne says. So he took a new tack, studying the way vibrations caused by the wind led to the collapse in 1940 of Washington's Tacoma Narrows Bridge (aka Galloping Gertie).Frayne's device, which he calls a Windbelt, is a taut membrane fitted with a pair of magnets that oscillate between metal coils. Prototypes have generated 40 milliwatts in 10-mph slivers of wind, making his device 10 to 30 times as efficient as the best microturbines. Frayne envisions the Windbelt costing a few dollars and replacing kerosene lamps in Haitian homes. "Kerosene is smoky and it's a fire hazard," says Peter Haas, founder of the Appropriate Infrastructure Development Group, which helps people in developing countries to get environmentally sound access to clean water, sanitation and energy. "If Shawn's innovation breaks, locals can fix it. If a solar panel breaks, the family is out a panel."'Frayne hopes to help fund third-world distribution of his Windbelt with revenue from first-world applications -- such as replacing the batteries used to power temperature and humidity sensors in buildings. "œThere's not a huge amount of innovation being done for people making $2 to $4 per day," Haas says. "Shawn's work is definitely needed.'

Topic by ewilhelm    |  last reply

My LED Driver? Answered

Right so i asked about how i could dim this circuit but i forgot to put a link of the circuit in question . i wanted to know how i can control dimming of an LED. i have 3 LEDs into one LED RGB they use 350 MAh 3.7 V each and i used 1W 3.9 ohms resistor on each Vreg. they have + as the Common.   is it possible to just put a potentiometer between the driver and the battery?  or do i need to a high tech micro controller?

Question by unaffiliatedperson    |  last reply

A question about LEDs? Answered

Hi all first post. Called fairy lights, rain drops, peals, party strings. They come in all different colors, lengths and price points; sold on Amazon and eBay. I cannot find them individually and I can't locate any information on them. My multi-meter needs to be replaced I can't really trust it and I want to cut a string making  different lengths. The transformer that came with 12volt 1amp, will I need to put a resister in line? Their in parallel but I don't know if is the cathode or the anode that has the double wire. Does that matter? It's possible that they are the pico/micro size chips encased in a clear resin. There is approx 300 leds on the string aprox. 4 per ft.

Question by distantansia    |  last reply

Can the arduino detect frequencies?

I want to make a spectrum analyser and I want to use a micro controller, but I don't know how. I want to know if the arduino (any one) can split up the different frequencies and output them, so I can use it as an input to an LED driver (LM3915). This will allow the LEDs to be at full brightness and respond to the output of the arduino, if the frequency filter is possible. If not, I will use a series of bandpass filters instead. I want to make an 8 band spectrum analyser. I just thought that using an arduino would be cheaper. Thanks. The schematic I will be using:

Question by knektek    |  last reply

How can I make an LED scanner? Answered

I've been looking for a detailed schematic for an LED scanner with 5-10 LEDs.  I want to use the least amount of parts possible without a micro controller.

Question by metsfan1938    |  last reply

LED powering and switches

I am trying to build a small display box that has 2 LEDs (either 3mm or 5mm). One LED lights the displayed item from above, the other from below.  I plan to use only 1 LED at a time, so I presume I need an SPDT-Center off micro rocker switch.  I have a small model and it provides ample light with 2 CR2032 batteries, however, I'd like to be able to use an AC/DC adapter in place of the batteries. I need help figuring out what parts I need so I don't create anything dangerous. I am confused by the terminology used for the many amps/volts would I need? Am I correct that I would need a 6v adapter? Can the adapter be wired directly to a battery holder, or can it be SAFELY wired directly to the switch/LEDs? I want to order some stuff, but I don't know what I need! If anyone can provide this info, I would be grateful! Thank you.

Topic by craigo  

Picaxe08m to drive a led to the music?

What i what to know is. Could i connect the positive line of a amp to one of the readabc pins of the micro. then pwnout that value on a pin. Then have a led on said pin that variys in brightness depending on the music. 1. If i could do that would the picaxe run fast enough to update the led very quickly? 2. Then could mix multiple colored leds together to have a left and right channel system?

Question by wee_man    |  last reply

USB powered LED with Program?

How would i make it so theres a program to turn a led on and off via usb, i already stripped the usb cable to get red, black, white, and green wires, i know vb6, so i can write it in there. Help very much appreciated, been using google, and cant find it. EDIT: i dont have pic micro controller.

Question by MrCircuitBoy    |  last reply

where to buy micro-tip soldering iron?

Anybody know a good place to order a soldering iron with a very small tip? I want it for working with 0603 LEDs. I can't find replacement tips for my current soldering iron. Something not too expensive would be nice.

Topic by aliasjanedoe    |  last reply

Faint LED's while using an Arduino Micro and shift register? Answered

This is more of a "How things work" question, but a question non the less. I have five 595 shift registers hooked up to an arduino micro. Everything is wired correctly, and it all works beautifully on my test bed, all the codes work fine. Only issue is that my LED's are only about half as bright as the sun.. Anyways, I was testing one of my codes at work, and due to the bright, flashing LED's that were popping up on the 595 portion of the board, decided to just power them off but removing the 5v leg going to them (I know, it would have been better to just set in an "all off" in the code, but I figured removing the power pin would work). However, removing the 5v leg to the 595 didn't turn them off: it only made them about a third as bright as they normally are. I checked to ensure that there was no power getting to the 595's, and there is not.  So: why would the LED's connected to the [unpowered] 595's still turn on?

Question by DoctorWoo    |  last reply

Has anybody used an LED dome kit to make their own mini-LED photo panel?

I was thinking about making a micro led light panel using one of those LED interior light kits.  It seems to me that it'd make a pretty decent budget imitation. The real deal.   DIY solution? Any thoughts?

Question by micah1_8    |  last reply

Micro LEDs... How can I power them in the smallest footprint possible???

Hi - I've been a "member" for 5 years now, but unfortunately never submitted projects... I'm more of an observer than a teacher :) I have this project I've been thinking of for quite some time now, but I simply cannot come up with a way to make it real. It's pretty simple, I just want to be able to light up an extremely small LED in a very small amount of space. But, I'm finding the power source is the headache. I wanted to get input or suggestions from anyone willing to share/help me! Basically, I have a 5mm diameter space (x approx 7mm high) to work with... and this would be to house the LED, power source and any type of on/off control or switch. My initial thoughts were toss in a micro LED, run it off of a wireless coil or super small battery and control it with a magnetic latching switch for on/off control. But, since the original idea popped up, it appears for wireless power the coil would need to be too large to fit in this space. For battery power, I've found very small 1.5V watch batteries that I could stack in a pair for 3V, but I've learned they would likely only run an LED for about 15-20 mins before they'd die. If they were wireless, I'd want some free range of motion and distance on the LEDs, being able to light up at least 6 ft. or so from the power source, if possible. This is driving me crazy! Can it be done, without costing a ton of money to develop?

Topic by djc311    |  last reply

What really happened to my Arduino Uno R3?

My Arduino  Uno R3 was working properly, but I connected it to a power supply board along with relays and GSM modem and some voltage fluctuations and blinking occurred. I immediately disconnected everything from it and connected Arduino to my PC. But I was not able to upload any programs to it. avrdude: stk500_recv(): programmer is not responding I was getting this error report. I disconnected every connections from it, but still I was not able to upload programs to it. When connected to PC the 'ON' and 'L' LEDs are glowing steadily. No blinking occurs to 'L' LED even when the reset button is pressed. Also the micro-controller chip is getting overheated(By a little more than usual). There is no problem with my USB drivers because I am sure that it was working fine on Windows and Linux. Can you please tell me what the problem is and how to fix it? -Thanks

Question by 1nventor    |  last reply

Arduino with multiple RGB LEDs

Hi, I am pretty knew into the Arduino world. My problem is trying to make multiple RGB leds ( 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!

Topic by Isaac Emery    |  last reply

How do I safely connect a micro switch to a 6 outlet power supply? Answered

I have the Big Dome Push Button (sparkfun electronics) so I can start the power for an arcade machine with a press of a colorful lighted button. However, I'm new to the hobby of electronics so even this simple build is confusing to me. I basically need to connect the micro switch and LED  to a typical 6 outlet power supply. Help!

Question by Peteredbeard    |  last reply

simulate lightning Answered

Hey, i would like to simulate a lightning storm in my aquariun, by using 6 cree xre led's and some sort of micro controller to control the flash, i need to figure out the multi flash and random flash and flash druation, any ideas would be welcome. also what controllers out there can handle  say between 500-700 milliamps,

Question by tinman11    |  last reply

Wave JT Kit - LED Chaser with Joule Thief - Sale

Wave JT is an LED chaser/Larson scanner/sequencer what runs with just one AA battery. Joule Thief circuit boosts the 1.5V (or less) from the battery to 5V to power the microcontroller and LEDs. The kits are available at $19. PCB alone is $7. *** Summer Sale Price *** > see the instructable > go to my website for purchase

Topic by ledartist  

Linear LED ammo Counter? Answered

So, my friend and I are building a Coil Gun!  Nothing super powerful, but it will punch a nice hole in a cardboard box.  Here's the problem; we want to add an ammo counter to it.  We were thinking of using an IR LED, a Photo-transistor, and a voltage comparator circuit, kind of like the one here ( , first photo, right circuit)) .  The circuit would send a pulse when the projectile interrupted the IR beam. Now what?  The magazine holds 6 rounds, so maybe 3 green LEDs, 2 yellows and 1 red to count the ammo.  We were thinking of maybe using a 4017 counter IC to advance down an LED after each pulse, but doing it this way means only one LED is lit at a time.  We would really like it if somehow we could have all the LEDs lit, and after each pulse one would turn off, but I'm unaware of how to do this.  Oh yea, we don't have access to a micro-controller, which is why we have this problem.  So to recap, we need a circuit that will light 6 LEDs when powered on, then shut off one LED for each pulse received.  Is there any way to make a circuit that does this?

Question by aeronut01    |  last reply

Alternate IC for PIC16F688...? Answered

Im making 5x5x5 LED cube display and im unable to find micro-controller IC PIC16F688. Can anyone suggest alternative IC...

Question by Abhishek.mathur    |  last reply

How to make a small 3x3x3 led cube?

Hey I want to make a small 3x3x3 led cube for placing in my desk. I see some of charliplexed cube but they are difficult to understand. So pls hlp me. I want a small cube run by cheap small micro-controller like attiny. Pls give me detailed circuit and code to run. Thanks in advance 

Question by Soumojit    |  last reply

rgb with out a microcontroller (beam-ish?)

I have been trying to contemplate how to make a rgb random oscillation, with the option of pressing button 1 for red button 2 for blue button 3 green. with no micro controllers, unfortunately I cant seem to do it most of my concepts run in to problems. any advice would be appreciated. preferably in the more helpful verity. bare bolts and brass tax is the point of this, i will be making a instructable for it if i can figure it out. the led's are common anode.

Topic by CD_tatro  

How do I make a power indicater light for a bluetooth?

I have Bluetooth headphones, & I'm modifying them. I want my Bluetooth to light up tow external LEDs when I turn the device on. I can't wire a line to the micro LED, its to small for me to solder. I was thinking wiring the External LEDs to the Bluetooth's battery. Is there a way to make a simple connection from the battery, to the external LED wire & back to the circuit board, so when ever the Bluetooth is switched on, all the external LED is indicating is the power going to the circuit board?

Topic by elkaddalek    |  last reply

Solar LED strip using lgabc21865

I have 2 solar panels that were used to charge shed lights (2 x AA batteries from each panel). And some lgabc21865 lap top batteries. I'm curious what would be needed to run some 12v led strip lights instead of the poor lights that were originally there using the LG batteries. Or if the idea is even worth the trouble. I'm very new to electronics in this capacity of setting up batteries with BMS. But I feel like it would be a good starting point to learning and useful at the same time. I have seen many tutorials on setting up battery packs with the batteries, but nothing for charging with solar or outputting 12v. Everything seems to run 5v using the TP4056 and micro USB. Any advice or information would be super helpful.

Question by NathanA52    |  last reply

How would I make a 2000+ lumen white LED circuit?

I'm thinking of using so I can drive the circuit with a TTL pulse and three of, but I'm not entirely sure on how to wire up the circuit/choose the correct values for the components. Any help would be awesome!

Question by bwee    |  last reply

How to power my LED Strips?

Q: How can/should I power my LEDs? Info: I am using 3m of adafruits 144 LED strips and 4m of the 60 LED strips. 144 LEDs    60  LEDs    My Power Supply Micro Controller I would love if I could somehow use my computers power supply to help power these lights, however I doubt this is possible with the amount of wattage/amps these guys will pull since I am using so much. So should I pick up a dedicated power supply? If so from where? Whats the best way to do this as well? Thanks!

Question by afarmer10    |  last reply

I would like to set up a simple LED light show using 6 to 8 rgb led's Answered

I'm not too good with electronic and as i was searching throught this website i came accross and instructable that was using the parallel port of a computer. Sounds nice but i do not have a parallel port on any of my 4 computers (2 mac and 2 pcs) What would you recommand for me as a starting point for this project? oh by the way by "led light show" i mean it could either react to music or simply be a random pattern or both. It can be controlled by a computer or a micro controller. Any suggestions?

Question by bluepills    |  last reply

Tiny Programable board for 2 LEDs?

Greetings, I'm looking for advice on how to make and get and effect on a project I'm working on. Basically what I'm wanting is to have 2 LEDs (which will be a set of eyes) that will have random sequences of blinking and change at random intervals. Something that isnt constant and overly repetitive, more natural and subtle. I've never done something like this to this level quite before so I'm looking for something intuitive and simple if possible. The space I have to work in is extremely small too, like less then 2 inches squared. It also needs to be run by battery, however that part doesn't have to be within the small space if need be, although it would be preferred. Would raspberry Pi, work/be a good option? I've NEVER used it before. I've also heard about "Arduino". Would that possible work? Are their better options/suggestions? I really dont know what I'm doing here. Hhahaha Thanks -JXZ

Topic by JXZ    |  last reply

Do I need an Arduino for this project? Planning on making clocks, don't even know where to start...

I've been wanting to get an Arduino or BBB or some type of microcontroller.  I want to make a clock where an led lights up for every hour and one for every minute.  So it will have 72 LEDS, and it needs to be accurate...I mean it's a clock, right...  So what do I need to accomplish this project?  DO I need an arduino, do I need to program a chip with an arduino?  Do I even need a chip? Also have another clock project.  I want to make a clock that uses two stepper motors one will turn the hour hand the other the second hand.  Needs to be accurate, of course.  So do I use an arduino to accomplish this?  I'm feeling a bit overwhelmed right now.  I really want to make these clocks, but I don't know what the first step is.  I guess that's kind of what i'm looking for...the first step and to be pointed in the right direction.  I don't want to be told do this then this then this....just need all of your collective knowledge to get the ball rolling, or clock ticking.  Just be patient with me please.  Im very new to "electronics" but it's something I really want to get into.  I'm just having trouble getting going.  Thanks for your help guys, I know yall will come through.

Question by holychachi    |  last reply

Building a 3 x 3 x3 LED Cube controlled by an Arduino?

I built a 3x3x3 LED cube and tested it. Since I'm new to electronics and micro programmable processors I'm having a difficult time connecting the cube to the Arduino and haven't had much luck getting information fundamental enough for me to grasp. I've tried a few ways and as you would expect, trashed a few LEDs to say the least. Since the digital pins output 5 volts I can't figure out how to connect the  9 anodes and the common cathode per level.  Can anyone help? Thanks, 

Question by happywatt    |  last reply

how can i modify the circuit by replacing the LED and photo diode by using ultrasonic sensor? Answered

Please for any one who is capable of drawing a schematic diagram on how i can modify, and use ultrasonic sensor  as a transmitter and receiver for my circuit to work well. also i want it to operate without using micro-controller. 

Question by YallajevoM    |  last reply

Code for controlling the brightness of LED using Bluetooth module HC-05-v1.0?

I am using arduino ATmega328 micro-controller. i tried some analog coding to control the brightness via Bluetooth module but the output value of the LED is constant. The code I used is, int ledPin = 5;  int fadeValue = 0; void setup() {     pinMode(ledPin,OUTPUT);     Serial.begin(9600);     delay(100); } void loop() {   // fade in from min to max in increments of 5 points:     if (Serial.available() > 0)     {            fadeValue = (int);            Serial.println(fadeValue-48);            for(int i=0;i<=fadeValue;i+=5)                analogWrite(ledPin, i);                    } }

Question by santhoshpl3    |  last reply

Mini Mood Light v1 Kit

The Mini Mood Light is a small interactive and reprogrammable coloured light generator circuit.  The mood light consists of a Texas Instruments MSP430 micro controller connected to two RGB LEDs, four buttons and some supporting components all on a custom circuit board. Detailed assembly instructions are available on Instructables. The kit is available from for €20 and posted worldwide from Ireland for €2.

Topic by robert.fitzsimons  

i need help putting a circut together :P *im some what pathetic*

Ok so i know how every thing works for this. i will play a song and it will be split into 1 a speaker and the other a op amp to get rid of the negitave voltage whitch i feed into a micro controler to tell it what to change the colors of the RBG LED to change to with sertain parts of the song " i will do this cauze electrity gose up and down  so whe  its in middle i could have it green top red bottem blue" and then i will have the micro controler open sertain ground conections to light up the right color the RBG led eill contantly be powered. "im bad with remebering names so sry if icant tell you the name"

Topic by -Tykora-    |  last reply

pic 12f629 12vdc to 220vac inverter

Hi, i have a few pic 12f629 micros laying around. i want to use one of them to blink 2 led's seperatly. the other one i want to use to make a ups(dc/ac inverter) that automaticaly  turns on when the power goes out and indicate a wen a battery is low. I am very new to programming micros, at he moment i can program a single led flash using the WDT (watch dog timer). Any links to diagrams, photos or code will help. currently i only know how to make a program in asm and compile it to hex. Thanx for any help

Question by tesla trooper    |  last reply

how to switch on an and off a LED from my PC through RS232 ?

Hello guys,i want to switch on an and off a LED from my PC through RS232.i have developed a program in java which writes on to the RS232 port.can you help me with the circuits?? because i have zero knowledge of the circuit connection i would want to build on this project phase by phase like:1. making the one way on and off to a two sided(i.e. if i press a button on the circuit outside i get a message pop on my program telling what ever message)2. converting it to a wireless.3. then think about the micro controllerslike wise..thank you guys in advance.bye

Question by orionred11    |  last reply

Random flashing LEDs when using shift registers and turning on the system: how to fix? Answered

I have a setup using 5 shift registers (74HC595s) hooked up to an arduino micro. Everything works great! So much so, that I didn't pay too much attention to the start up issue. When I start up the system (either by hooking up a battery or plugging it into a USB socket) the LED's hooked up to the 595's will either turn on according to the last pattern they had, or turn on randomly. I was following the Arduino tutorial for this, and it does state that "The one flaw of this set up is that you end up with the lights turning on to their last state or something arbitrary every time you first power up the circuit before the program starts to run." It also states "You can get around this by controlling the MR and OE pins from your Arduino board too, but this way will work and leave you with more open pins." However, I'm either missing it or it is not outlined how to hook up the MR and OE pins to the setup to correct this. Any help is greatly appreciated! 

Question by DoctorWoo    |  last reply

Where can I find a PIC microcontroller, in electrical appliances or else? Answered

I thought It'll be better if I could get a PIC micro controller from an Electronic appliance. I need one to make an LED Cube for my project, I need minimum 10 and it'll cost me more than I'll have to sell them for. I think I'll find one in an old radio or something . . . . .  So could someone please tell me: Where I could find a PIC microcontroller, from any device?

Question by hrpearl01    |  last reply

Simple circuit in a flashlight to alternate between steady and blink with push button.

Could anyone tell me what the circuit in a led flashlight is that allows to it be alternately off, low beam, high beam and blinking with just a push button. Is there a way to achieve this without a micro controller. All the responses I can find involve the use of something like an arduino. There has to be a simple circuit for changing through the modes with just a button as the lights are quite inexpensive. Thanks a lot.

Question by diywannaber    |  last reply

Will this circuit work?

Ok, so I'm building a giant led array and I'm running it off of a PWM chip and a few shift registers. Given the number of addresses and variables I need for each one, I'm guessing that the micro running the show won't like that too much and will be a bit slower than I'd like, and i'm not sure if it will be slow enough to cause irritating visual inconsistencies. This got me thinking, how did tube TVs do it? They had phosphors that slowly released their charge and therefor looked alright. Thats how I arrived at this circuit. Will it pretend to be a phosphor well enough or will it need something different?

Question by The Ideanator    |  last reply

Solar battery charging

Have been looking at the instructable on the micro solar generator, and wondering if there is a formula to calculate how big a solar panel is needed to charge a battery. I'm looking at maybe using a car battery to run some LED globes such as the one below on my deck, they run at 1w 8mA 12v. Any ideas?

Topic by dover1123    |  last reply

How do I choose an optocoupler/transistor? Answered

There are 2 circuits,one is a clap switch which provides output to ground voltage as 12 volts,and with a resistor,I managed to get an led to turn on each time I clap.I wanted to interface it with a clock which shows time when a button is pressed,but the problem is the button(marked as "show") isn't connected from microcontrollers  pin to vcc but from micro's pin to gnd (find attachment for reference).so I wanted to chose an optocoupler or transistor,but being a school student,I haven't  learnt about them,though I know how to connect them. also,please suggest some method (transistors or optocoupler & which one) to increase the number of output leds without overloading the micro Please help

Question by Suraj Grewal    |  last reply