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Author Topic: 12v RGB LED Strip with common cathode  (Read 1321 times)
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I am trying to figure out how to power an OLS 12v LED strip with a common cathode and three anodes. I am linking two strips end to end and they run at 12v 2amps each. I know that I need some sort of transistor and resistor setup to use an external 12v source to power the lights. I want to use an Arduino UNO to use PWM on the lights. Anyone know how to do what I'm trying to?
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So you are looking for something like this?

http://www.ladyada.net/products/rgbledstrip/
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No I think he is looking for something that works and won't blow up his arduino board.
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Haha... Yes no blowing up of the board please! I'v been fooling around and I can power each color individually. However gaining independence of all three seems to be challenging. The ultimate goal here is Midi controlled LED strips through Ableton Live. I can do it with smaller LED's. Now I want to step up my game.

Ideas welcome
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Also these strands might not run at 2amp. That was what the power source was rated at. But I just use my own external 12v source.
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No I think he is looking for something that works and won't blow up his arduino board.

Hi,

I am puzzled, I have thought about it and can't see how this will damage the arduino if the circuit is flipped to account for common anode instead of cathode...

rough schematic attached.


* LEDstrip.JPG (51.62 KB, 977x790 - viewed 39 times.)
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Well all the current is being drawn through the 1A series diode in line with the DC input jack, so at 2A that will blow.
That circuit is wrong, you will get no more than 4.3V to drive the LEDs.
So as I said apart from blowing up the arduino and it not working it's great.
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Can someone please post a correct schematic for this project I am currently working on a similar issue.
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Can someone please post a correct schematic for this project I am currently working on a similar issue.

problem was solved in this thread:
http://arduino.cc/forum/index.php/topic,62080.0.html
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Thank You Steve.
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