Hi everyone, has any one used led strips with 12v,R,G,B pin outs?

Curtis_Smith · August 2, 2016, 2:43am

Hi everyone, has any one used led strips with 12v,R,G,B pin outs? I have no idea what they are called. Got them second hand with no info on them. Does fastled work with this style? How are they wired?

Thanks!

Amanda_Walker · August 2, 2016, 3:06am

I have a few strips like this. They aren’t addressable, so you can only set the color of the whole strip at once, which you do by PWM on the the R, G, and B lines. You can drive each of those pins from a 5V PWM signal by using a FET (example: IRL520) as a level shifter to 12V.

Curtis_Smith · August 2, 2016, 3:11am

@Amanda_Walker ahhhhhh thank you!

Amanda_Walker · August 2, 2016, 3:31am

Wire the FETs up as low side switches (that is, drive the +12V line with +12V, and then when you drive the color lines to ground, the LEDs will light up. I’m not sure if FastLED will be useful for these, unless you want to drive these strips in sync with something else.

Daniel_Garcia · August 2, 2016, 5:09am

github.com

FastLED/FastLED/blob/master/examples/AnalogOutput/AnalogOutput.ino

#include <FastLED.h>

// Example showing how to use FastLED color functions
// even when you're NOT using a "pixel-addressible" smart LED strip.
//
// This example is designed to control an "analog" RGB LED strip
// (or a single RGB LED) being driven by Arduino PWM output pins.
// So this code never calls FastLED.addLEDs() or FastLED.show().
//
// This example illustrates one way you can use just the portions 
// of FastLED that you need.  In this case, this code uses just the
// fast HSV color conversion code.
// 
// In this example, the RGB values are output on three separate
// 'analog' PWM pins, one for red, one for green, and one for blue.
 
#define REDPIN   5
#define GREENPIN 6
#define BLUEPIN  3

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