Integrated Servo Driver
What
Replace the controller board inside a cheap PWM servo with one that supports CAN
Start from Single Servo Driver with the L4
Remove to make it smaller:
portions of CAN filter
LEDs
Add in DC motor driver and encoder
Change connectors and board shape such that it fits inside a standard servo
Why
smaller, lighter
When
no idea, this project will be pretty difficult and arguably not that useful compared to Single Servo Driver but it might be fun so will leave it here as an idea.