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- 该智能小区安防系统运用了AT89C51单片机、四种报警传感器、模数转换ADC0809、CAN总线控制器SJA1000和CAN总线收发器PCA82C250。-The security system of intelligent community using AT89C51 microcontroller, four alarm sensor, analog to digital converter ADC0809 and CAN bus controller SJA1000 and CAN bu