i want to use the pwm method to control the motor and i want to build the circuit myself.

for the sensor, i want to make an optical tacho for about 100 rpm in speed, and the accuracy must be very high maybe less than 1%.

yeah, i want to learn and build the system myself not buying it. for the closed loop system i gonna use fuzzy logic control i don't wanna use the PID cause from what i learn you're gonna need a lot of mathemathical background and i'm not very good with it.

thanx for your advice Raghu, i'm a newbie at 8051 and still wanna learn more.