I

I have an application where I need way to accurately measure distance with
PIC or BS2. I need to measure pedal travel on different vehicles. The
distance measurement need to be repeatable. So each time the measurement
device is attached to the pedal the same measurement is made.

To explain further, say a linear potentiometer is used. If the potentiometer
is angled to contact the floor at different places the pedal travel
measurement will be different. That is something I need to eliminate. An
ideal solution would be a non contact method that would measure the same way
each time the device is attached to the pedal.

The measuremnet needs to be accurate to an 1/8" and repeatable. The cost of
raw measurement components should be less then $20.

What would the best measurement method be?

Any ideas or other suggestions?

Thanks

Jon