I have a question on my hexapod project.
I will be using 18 sg90 servos on Arduino Mega. I thought it would be useful if I bought a driver so I bought a pca9685. The problem is, I bought only one cause the buyer said it would be enough with the pins on Arduino itself but now I feel at loss and I actually don't know if it would be okay if I connect 16 of them to PCA and 2 of them to Mega? Or how can I connect them exactly? I will use S-Link 5V 20A power supply and I have included my schematic. I didn't know how to connect the grounds and reds of the 6th leg to the arduino.
I would be very happy if someone would be nice enough to help me! Many thanks