A wireless access control system based on CDMA and DTMF technologies

This design has realized a wireless access control system combined CDMA voice intercom and DTMF coding identification technologies. The wireless access control system could also update user data real-timely through CDMA network. The concrete passing time of residents and visitors from the access control system can be recorded real-timely to benefit the security maintenance. This design consists of following hardware configurations and corresponding circuits: ARM central control system, CDMA communication system, DTMF coding system, cap-sensor touch button, etc. This access control system creatively puts forward CDMA as the communication medium, and takes ARM as main control unit. It has completed the entire communication and control functions, and taken the cost into consideration. Until now, it is rare to see such products or designs that use similar communication technologies.