Design of Temperature Monitoring System Using Distributed Intelligent CAN Bus Networks

Temperature sensing and control remain challenges since temperature is a critical index of the increasingly growing in agriculture and smart planting. CAN (Controller Area Network) bus, due to its high stability, anti-interference ability, timeliness, adaptability to complex industrial environment, good performance, it has been widely used industrial communication among networked instrument. In this project a STC89C52 microcontroller is selected as the master chip, using as an independent CAN controller SJA1000, PCA82C250 as the CAN bus driver to achieve CAN bus communication, designed and implemented based on CAN bus network multi-node temperature monitoring system, including the master node controller, from the node controller and PC server-side procedures. The system in real time from a node can collect temperature sensor DS18B20 temperature signal transmitted via the CAN controller SJA1000 CAN controller to the receiver, and then before sending the master node, the master node receives the signal can be displayed on the LCD screen, you can also via RS-232 bus serial transmission to the host computer program computer display, the other computer can also send commands through the host computer to control the master/slave node, enabling on-line monitoring distributed CAN bus network in site-specific farming.