Interfacing of Traffic light controller

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Presentation transcript:

Interfacing of Traffic light controller

HARDWARE FOR TRAFFIC LIGHT CONTROL 12 electric bulbs Port A is used to control lights on N-S road and Port B is used to control lights on W-E road. Electric bulbs are controlled by relays. 8255 pins are used to control relay on-off action with the help of relay driver circuits. The driver circuit includes 12 transistors to drive 12 relays.

Interfacing of Traffic light controller

Software for traffic light controller

Program:- OUT 83H (CR) START: MVI A, 09H OUT 80H (PA) MVI A, 24H OUT 81H (PB) CALL DELAY1 MVI A, 12H OUT (80H) PA OUT (81H) PB CALL DELAY2 MVI A, 24H OUT 80H (PA) MVI A, 09H OUT 81H (PB) CALL DELAY1 MVI A, 12H OUT PA OUT PB CALL DELAY2 JMP START