A video of my hardware and software controlling the pointer and counter on a 747 fuel quantity indicator.
In this post, I disassemble a 747 fuel quantity indicator and reverse engineer the electromechanical parts of the indicator. I then apply hardware and software techniques used on previous projects to build a PID controller for a control loop consisting of the AC servo motor and feedback potentiometer in the indicator. This control loop is used to position the dial and counter on the face of the instrument to values entered into a serial terminal.