Hi Tony, Not sure if this is of any use but you may want to take a look at my speed controller project at www.gloomy-place.com Source code for decoding RC pulses plus software PWM plus a simpler (no H bridge) circuit. The software would be easy to change for use with a H bridge.... Andy -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu