[Sparks333]

Hi!
We never used the sensors in competition (we wanted quadrature, so we made our own hall-effect sensors) but we did fiddle with them. What we found matches what Eugene found: follow the sample circuit. That resistor makes the waveform much cleaner.
Furthermore: Those are some good sensors. They count very accurately (we used them on a gear) and the programmers had loads of fun learning about how to use interrupts.

Sparks