Design of Long-range Control System Based on CAN Bus and DTMF

DTMF technology and CAN bus were introduced to analyzed function and principle of ring testing,DTMF signal modulating/demodulating,telephone onhook/offhook simulating and CAN bus data transmitting.Then a long-range control system was designed with AT89C51CC01 and MT8880 chips.The system was a multi-node family control system in which information transfers through DTMF public telephone network and CAN network.The accuracy,practicability and flexibility of the system were validated by the practical experiments.All the functions were realized.Real-time and reliable information transfer was achieved and the situation of the remote control objects could be queried and controlled.The system was suitable to long-range remote control for domestic appliance or other devices.