Alarm system for unfastened rear seat belts of automobile

The invention discloses an alarm system for unfastened rear seat belts of an automobile. The alarm system comprises a single-chip microcomputer, seat belt lock-catch-type switches, seat pressure sensors, an automobile speed sensor and an alarm warning unit, wherein signal output ends of the seat pressure sensors are connected to a pressure signal input interface of the single-chip microcomputer through the seat belt lock-catch-type switches; a signal output end of the automobile speed sensor is connected to a speed signal input interface of the single-chip microcomputer; and an input control end of the alarm warning unit is connected to an output control interface of the single-chip microcomputer. The alarm system for the unfastened rear seat belts of the automobile has the advantage thatthe circuit structure is simple and reliable. While ensuring the safety of rear passengers, the alarm system facilitates the accurate judgment by a driver on the seat belt fastening situation of the passengers in the automobi