I measured 3V on pedal's led. I go for it.
Arduino and pedal can use same power supply! I go for it too.
What about my additional LED?
I think I'll just use a small battery there.
Would it be enough to add a transistor as an switch?
I would need two wires then. One connected to Arduino digital out and another connected to common ground.
Right????
Is it possible to use same power supply for all three users? The distance is 6m, or even longer...
sikter