Driving robot with movable head

These are the parts of a robot I once built. It took me ages and I didn't quite had time to finish it. I used Adafruit Feather components (motor drivers) and (I think) Teensy 3.2 with Amp-Shield for the speaker. The rotating servo head part contained a condenser mic and an gesture ZX sensor (infrared). Unfortunately, I didn't take many picture while it was working, I can only share a short video of it driving, looking at things that come into view and avoiding obstacles while driving...

https://youtu.be/0am_4cZ2UoU