I am developing a electronic throttle control system for FSAE, and by rules of FSAE, I need to have 2 or more potentiometers to measure the position of my pedal. I've decided to use a rotary pot both ends of the pedal, but I am having trouble finding a 3rd potentiometer to use.
Is there any other sensors that can be used to measure angle position that would fit on(or in!) a metal axle? The issue I have is both ends of the axle are already being used by the 2 rotary pots.