[EricVanWyk]

Originally Posted by Mark McLeod

Here's the whitepaper that was done at the time:
http://www.team358.org/files/electri...Tachometer.pdf

It never made it to CD whitepaper posting for some reason...

It's still working. We were using it the other night.

Thanks! One of my favorite lessons for electrical teams is the relationship between current and torque, voltage and speed.

As a side note the analog inputs can handle +/- 10V, so you could loosen the resistor divider, ditch D1 and replace D2 with something bi-directional.