The Development Of Elevator Weighing Device Based On CAN Bus

As the rapid development of sensor technology and computer technology, elevator weighing device of elevator control systems are becoming increasingly important. It can be real-time within the payload of the car weighed, can determine the elevator is heavy load or light load operation is running, you can also go straight to further achieve full strength, overload alarm and prevent system disruption, no-load energy-saving features. Meanwhile, the elevator system requirements on the weighing device are also rising. Not only high accuracy, high reliability, versatility, and in real time, intelligence and networking are also put forward higher requirements.This paper describes the elevator based on CAN bus weighing device development, it is taken into account the above requirements, starting from a higher precision, designed a simple circuit to achieve low power consumption and convenient weighing device. And the combination of network technology and communication technology is presented with real-time strong anti-interference ability, and good reliability of the CAN bus communication design ideas.This paper first, especially on the field bus CAN bus provides an overview of the presentation and measurement principles from the perspective of a weighing device design and analysis, given the appropriate design. In hardware design, the use of resistance strain gauge load cell and weight gain corresponds to the weak analog voltage signal, and then by a△--Σtype A / D converter 7705 to complete signal amplification and conversion module, and then into the MSP430 series single chip for processing, and finally by the LCD display shows real-time information. In the CAN bus communication module, it use a CAN bus controller SJA1000, TJA1050 as the transceiver drive. In software design, the use of C430 language, IAR EW430 system programming environment, and the C-SPY hardware simulation debugging. The master of software debugging contains signal acquisition and processing by AD7705,CAN communication between nodes, LCD display. Experiments show that the electrical system is reliable, safe, stable, and meet the design requirements.