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Published on Aug 21, 2023


This project is developed for the users to control Traffic signal through Microcontroller.

It uses PIC16F73 (28 pin Micro controller). The micro controller controls the full operation of the traffic signal. The micro controller program is written in assembly language.

The traffic control has four sides. Each side has four lights called Red, Green , Orange and pedestrian light. The pedestrian light will be on when the particular side is blocked with red light.

When the device is switched on, the microcontroller generates positive pulses according to the direction and timings of each side. If green light glows in one side, other sides will be red. When the green signal is about to change, it indicates through orange light to both sides, that is green going to be red and red going to be green.

The microcontroller energizes corresponding relays through driver transistors. A NPN transistor is used as driver which drives ground from emitter to collector when its base is triggered with positive pulse. The relay supplies the necessary voltage to the signal lights.

If we use this project for traffic signal control, no need of man power. It itself will work properly. The signal settings can be changed by using the PC connected with the Microcontroller unit.

This project uses Visual Basic as front end tool and Assembly language as Microcontroller language

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