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Ok, I understand now. Thanks kenif!

I managed to get it working, it turns out the specs on the board were not very clear. I could connect the output pins of my PIC directly to the signal and set them low. I thought that maybe I would...

Thanks for the reply.

The 2 boards do share a common ground. The LED module has 4 pins: +12, GND, Signal 1 and Signal 2. I share the +12 and GND between both boards (+5 is generated through a...

Hi,

I have an external LED board that needs a pin to be pulled to ground to begin its flashing routine. If I connect a wire from ground to this pin it works perfectly.

How would I control this...