Drive (N * (N-1)) number of "Charlieplxed" diode matrices (e.g. LED Matrix) with N number of outputs capable of tri-state. The LED Matrix design is inspired from http ...

A 10k ohm potentiometer is connected to an analog input. Turning it translates into values in the range [0-1023]. An attached SSR is connected to a water heater. By turning the SSR on and off, it is ...