In my project I have 128 servos (Towerpro MG90D) connected to 8 PCA9685's.
My problem is the power supply. I'll be running the servos at 5v. The data sheet for the servos does not mention the current needed, but if I consider 1A each servo as the rule of thumb, I'll need a huge power supply.
My question is can I use multiple power supplies instead of a huge one ?
Do I have to have common GND with the 8 PCA9685's daisy chained ?
I'm posting a schematic that shows wiring for 3 PCA985's (sorry for the fritzing) with only one power supply. How do I change this set up for multiple power supplies ?