Design of Access Control System Safety with Multiple Password Control

Abstract

Adopting STC12C5A60S2 single-chip microcomputer as the control core, the access control system of a safe with multiple password control consists of fingerprint recognition, GSM-SIM900A, 24C02 storage, LCD12864 liquid crystal display, motor drive, keyboard, and sound-light alarm modules. Experiments showed that the system could accommodate 200 fingerprint data. The fingerprint recognition time was less than 0.4s; rejection rate less than 1%; and false recognition rate less than 0.001%. After passing digital password and fingerprint identification, the system sent a verification code to the user's mobile phone. When the code was verified, the system started stepping motor to open access control. The system entered frozen state with sound-light alarm if the error of digital password or fingerprint identification was three times. The alarm was sent to the user's mobile phone at the same time. The system had the functions of multiple password protection, remote monitoring and alarming, with a high security and practicality.