ON 20010409@9:33:14 AM at page:
http://www.piclist.com/techref/io/motor/regulate.htm
JMN-EFP-786 James Newton added 'See also:
http://www.ezy.net.au/~fastvid/encoder.htm
Roman Blacks notes on using the back EMF spikes from the commutation in a DC motor for speed feedback.'