I'm using PT4115 drivers for the LEDs in my shower wall and dim them with PWM: http://www.micro-bridge.com/data/CRpowtech/PT4115E.pdf
The thing is the location for the Arduino for accessing him easy. From the driver to the LED i guess its best to make the distance as short as possible because the driver goes up to 1MHz (datasheet).
Is it a problem to make the PWM cable from the Arduino to the drivers ~3 meters (10ft) long? The PWM pin will be split into 3...
Then i have 18 3.2V/20mA LEDs i also need to PWM. 4 connected directly to the Arduino and 14 connected to a PCA9685. Here i need 4-5 meters (13-16ft) and CAT cable would be best - problem?