Abstract:It is proposed in this paper the control system of a MEMS stronglink for PC authentication system, which is composed of MEMS stronglink, interface card and dedicated software. The stronglink is comprised of a multitry countermeshing gears (CMG) discrimination device based on micro electromechanical system (MEMS) technology. The control system is consist of micromotor driving system, electrical control system and dedicated software program. The PCI7248 DIO extending card and L6234 brushless DC motor driven IC are applied for the control of MEMS stronglink. The authentication system on PC startup is controlled by the program in BIOS chip, which gets the control during the POST of PC. The discrimination device has the function of automatic resetting with correct code, which can be tried 3 times. The success rate in 1000 times is 100%.