A development of distributed area traffic signal lights control based on single-chip microcontroller through CAN BUS is described. With the core of AT89C51, infrared receiver receives the infrared signal coming from launcher. The demodulation signal is treated by single-chip microcontroller. The single-chip microcontroller controls the CAN BUS controller to structure CAN BUS communication system to transmit the data. The designator of distributed traffic signal lights intelligent control system was carried out by three control styles of Vehicle flux, remote and PC. The paper introduces total scheme and system structure, also the hardware design of the system in detail. By experimental testing, when the key K1-K6 is pressed, time setting of east-west, south-north direction, emergency car, time's increase, decrease, holding are effectively controlled. When the low-level time of WDI is continuous greater than 1.6s, the RESET port of watchdog produces negative overflow pulse signal lasting 200ms to reset AT89C51.The design demands of system are all satisfied.
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