Arduino Forum

Using Arduino => LEDs and Multiplexing => Topic started by: soundguymatt on Aug 20, 2012, 12:24 pm

Title: High current LED's
Post by: soundguymatt on Aug 20, 2012, 12:24 pm
hi there all

for one of my projects I'm looking at using multiple high current RGB LED's, 3W LED's where each colour is 1w. I know Arduino cannot cope with that so i need something between the two - i looked at a Darlington array ULN2803A but that has a maximum of 500mA - i think i need 1A of more.

Any other idea's on how to amplify the PWM signal - or any other ways of doing it?

Many thanks
Matt
Title: Re: High current LED's
Post by: Grumpy_Mike on Aug 20, 2012, 02:46 pm
You can't just switch a high current LED like you can a low current one. You need to use a constant current driver. Either purchased or one you make yourself.
Title: Re: High current LED's
Post by: ardudillo on Aug 22, 2012, 05:22 pm
Check this out:

http://www.instructables.com/id/Circuits-for-using-High-Power-LED-s/?ALLSTEPS

(step 8 ).

I 've tried it out with an Arduino and works quite well.
Title: Re: High current LED's
Post by: mcreefer on Aug 22, 2012, 06:56 pm
I used this
https://www.sparkfun.com/products/10256
like this
http://bildr.org/2012/03/rfp30n06le-arduino/

To run my 20W led. Works great with PWM.