Research on the monitoring system of the grain quantity based on the CAN-bus

In order to measure the grain quantity in the barn, the pressure sensors are mounted on the ground and the wall, the quantity can be calculated by using these sensors´ value. The principle of measurement method is given firstly, then the monitoring system based on the CAN-bus is put forward, and the circuit structure of the communication interface, relay and the data sampling node are designed. To verify the effectivity and the reliability of monitoring system, some experiments are done, the results shown that, the measurement error is no more than 3% under the conspicuous level is equal to 0.05, the grain quantity can be measure by this system completely.