[Joe Ross]

Originally Posted by Ether

Or you can use the FPGA to measure the pulse width? WPILib counter object semi-period mode.

http://www.chiefdelphi.com/forums/sh...32&postcount=5

Semi-period mode is not ideal for this sensor, because the data sheet recommends using the duty cycle. When there is motion, you could get out of sync values if you're trying to measure the duty cycle in semi-period mode. You could measure just the high or low pulse and use other methods to calibrate out the 5% frequency tolerance.