Wireless vehicle detector based on giant magneto-resistive sensor

ZHANG Xing-bo， QIAN Zheng-hong， BAI Ru， LV Hai-yang， SUN Ling-ling
（Center for Integrated Spintronic Devices， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： In order to solve the problem of useless in the recent vehicle detector in the outdoors and bad weathers， a wireless vehicle detector was designed by using Giant magnetoresistive sensor and ZigBee technology. After the analysis of giant magneto-resistance（GMR）sensor outputs of the different location under vehicle， the relationship of GMR sensor output and location under the vehicle was established. A SAS03-1 sensor was used as the sensing element and the signal was collected by A/D concerter in CC2530 and transmit by Z-stack protocol. The detector was evaluated on the host computer program. The function of the detector was tested. The results indicate that the detector can sense real-time magnetic field changes caused by vehicles. The wireless vehicle detector has low power consumption and can be easily installed.
Key words： gait magneto-resistance（GMR） sensor； wireless vehicle detector； ZigBee