I have recently been asked to review a raspberry pi hat (from a programming view) that will allow PWM control of upto 16 servos, however I am hoping to use this time to work on a hexapod idea I have been thinking about for a while, which requires a minimum of 18 servo's, and preferably 20 (camera/sensor pan and tilt).
My question is:
What is a relatively cheap and uncomplicated way of extending my control over those extra 4 servo's?
It would appear most servo controller hat/shiels for arduino and raspi are upto 16 servos, and can be extended by buying another shield, are there any other options?
Any advice in this subject would be greatly appreciated, preferably dumbed down a bit, and I don't know a great deal about micro controller hardware (more of a software guy)