In message <3494F4D9.2C6E0DDA@explorenet.net>, richard dellacona writes >hello picsters > has anyone ever built a circuit to monitor the change in speed of a >dc motor using >the spikes (or noise) created by the motor the way i evision it working >is >start the motor then reset the pic and it learns the signature of the >noise >apon any change in speed the pic processor reports it to a cpu using a >I2C connection >any code or hardware sugestions would be appreciated > >thanks in advance A friend of mine measured a motor's speed using a PIC-based motor controller by periodically removing the supply, and measuring the emf generated by the motor. Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/rcm.htm for details of a low-cost reconfigurable computing module using the XC6216 FPGA