Abstract: The DC motor is an attractive piece of equipment in many industrial applications requiring variable speed and load characteristics for its ease of controllability. The speed control of DC motor is very crucial in application where precision and protection are of essence. Purpose of motor speed controller is to take error correcting signal representing the required speed and to drive a motor at fix speed. Embedded based speed control system consists of electronic component and some sensors.In this work, development of hardware and software of the closed loop DC motor speed control system have been explained and illustrated. The desired objective is to achieve a system with the constant speed at variable load condition. That means motor will run at a fixed speed instead of varying with amount of load.

Keywords: DC Motor, MOSFET, Microcontroller, IR Sensor.