Scribd
Upload
165 views6 pages

Traffic Light Control System

This project describes an Arduino-based traffic light control system. It uses Arduino Uno, LEDs to represent traffic lights for 3 roads, and a 7-segment display for countdown timing. The system cycles through activating the green light for each road for 9 seconds, followed by the yellow light for both roads for 4 seconds, and then moves to the next road, repeating in a loop.

Uploaded by

Rakin Mohammad Sifullah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
165 views6 pages

Traffic Light Control System

This project describes an Arduino-based traffic light control system. It uses Arduino Uno, LEDs to represent traffic lights for 3 roads, and a 7-segment display for countdown timing. The system cycles through activating the green light for each road for 9 seconds, followed by the yellow light for both roads for 4 seconds, and then moves to the next road, repeating in a loop.

Uploaded by

Rakin Mohammad Sifullah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 6

Traffic Light Control System

Circuit Design and its function :

This is a project based on a real life traffic control system. It is not the real one but this project
gives us an idea about traffic light controlling systems.

For this project I use,


- Arduino Uno R3
- LEDs (3 green, 3 yellow, 3 red)
- 7-segment display
- Resistors (x30)
- Ground.

At the beginning the green LED of road-1 will be active and in other two roads the red LED will
be active. This condition will stay until the 7-segment display counts 9 to 0.

After this countdown, yellow LEDs on road-1 and road-2 will be activated. This condition will be
active until the 7-segment display counts from 4 to 0. At the same time the red led in road-3 will
stay active.

After that the green LED of road-2 will be active and this condition will continue until the 7-
segment display counts from 9 to 0.

After this countdown, yellow LEDs on road-2 and road-3 will be activated. This condition will be
active until the 7-segment display counts from 4 to 0. At the same time the red led in road-3 will
stay active.

After that the green LED of road-3 will be active and this condition will continue until the 7-
segment display counts from 9 to 0.

After this countdown, yellow LEDs on road-3 and road-1 will be activated. This condition will be
active until the 7-segment display counts from 4 to 0. At the same time the red led in road-2 will
stay active.

Then the green LED of road-1 will be active again.


This whole thing will continue as a loop.

Codding :

First, select the pins for 7-segment display and for LEDs

Then in void setup I declare that all pins are for OUTPUT.
Inside void loop,

Here is the code when road-1 is active and road-2 and road-3 are not active. This will continue
until the 7-segment display count 9 to 0.

Code when yellow LED is active on road-1 and road-2. This will continue until the 7-segment
display count 4 to 0.
Then the green LED of road-2 will be active and the other two road red LEDs will be active.

Yellow LEDs are active on road-2 and road-3. This will continue until the 7-segment display
count 4 to 0.
Then the green LED of road-3 will be active. In road-1 and road-2 red LEDs will be active.

Then yellow LEDs are active on road-3 and road-1. This will continue until the 7-segment
display count 4 to 0.
Then the green LED of road-1 will be active again and the whole code will be run sequentially
as a loop.

You might also like