Abstract:The hardware, software and carrying out process of the vehicle flux detector are introduced. The detector uses the pyroelectric infrared sensor to detectwhether there is a passing vehicle, and use microchip to count the signal from the sensor. The microchip controls the CAN BUS controller to transmit the data. A number of the vehicle flux detectors can structrure a CAN BUS communication system to carry out the counting and supervising of many carriages and crossings. The detector can be expediently installed, and has better nicety and releable performance.