AVR-Chat

> Measure the travel of *this* wheel: http://home.hiwaay.net/~dkelly/Husaberg/Pages/4.html

No problem - add a reluctance pickup, near the chain, on the front of the drive sprocket.

As for measuring the liquid level, assuming the system is still, aim a columnated beam of 
light at the liquid surface at an angle from the side and sense the reflected spot on the 
other side.

Bruce