Abstract: According to the need of the control system of autonomous mobile competition robot, a 4-chan-nel micro DC motor driver based on C8051F single chip microcomputer, MOS tube and relay control isdesigned and implemented. Combined with the self-defined communication protocol, the driver receivesthe command from the upper computer through the RS422 serial bus to realize the remote control of thespeed and direction of the micro DC motor. The drive has the simple structure , low development and ma-intenance costs , and good scalability and use value.

Key words: C8051F single chip microcomputer, DC motor, relay: MOS tube: RS422 bus, driver