I working on an LED lighting project where I will be installing 20 boxes in a space, each containing 4 LEDs (RGB and IR.) I want to connect all of these boxes to central board which will drive all of the LED's using PWM signals.
----- Generic Questions:
Can I utilize all of the wires in the twisted pairs to send PWM signals, or should I only send one signal per twisted pair?
How badly will the PWM signal degrade over distance if 4 or 8 different signals are sent?
Will increasing the current (to 200ma or 400ma) hurt the signal (I am considering driving the LEDs with the signal, directly out of the cable)?
Should I send the same signal down both wires in a twisted pair, or should I pull one of the wires high (5v) or low (0v)?
----- Bonus Question and project specifics:
I will not be filtering the signal. Regarding precision, cost is a major concern for this project (we have a shoe string budget, so complexity will limit the number of boxes we can install.) 10% variance in LED output between the boxes is ideal (that will allow us to almost display #fff hex style colors.)
I will be using transistor arrays receive the PWM signal and supply power to the LEDs. Can I avoid he need for a circuit within the individual boxes by placing my transistor arrays on the central board, 20 feet away?