After writing complicated code to use rotary encoders and potentiometers to control the Lionel Crane Car, Gantry Crane, and Smoke Fluid Loader, I've realized its much simpler to just use a momentary contact switch-based joystick. These devices have just 2 states per position; on and off. They can directly map to Cab-1 RELATIVE SPEED or the Boost/Brake command. Using the gpiozero library, you can code it up so that if the joystick is held "on", the command can be fired repeatedly. I'll send along a video shortly, but this code is much simpler and works much more reliably!! I still allow the use of a rotary encoder to rotate the crane housing, but it also just sends a relative speed command with no acceleration factor. It doesn't look like a cab rotates any faster or slower on the Cab-3, so there isn't a need for complexity.
-- Dave
