Description: Done by 8255 output, controlling 12 out bright light-emitting diodes to simulate the management of traffic lights. East-west north-south crossroads. Initial state 0 for the east-west red lights, red lights north and south. State 1 (10s), something the green light opened the North-South red state 2 (3s), green things out, yellow light flashing several times, the North-South red state 3 (10s), what a red light, green light to the opening of the North and the South state 4 (3s), what a red light, green light to eliminate the North and the South, yellow light flashing several times. Followed by cycle
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单片机交通灯.doc
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