Chenhee I am currently doing a project where i use the feedback from the DC motor and using a PIC output the speed to and LCD. The best and probably easiest way is to use a Voltage to Frequency converter, this is then put into PIC where an A/D conversion is undertaken, it is then just a case to output this to the LCD. If you want some circuits and source code, email me personally. amb1eng@mail.bolton.ac.uk