Traffic lights using Arduino

In this post, we will design an Arduino based traffic lights control system that switches the lights at different time intervals.

Introduction- 

We are going to use Arduino to control three different LEDs on a different time interval.

Components required - 

1. Arduino board 

2. LEDs ( red, yellow and green)

3. 220ohm resistors - 3 

4. Breadboard and connection wires. 

Connections- 

1. Connect the +ve of Red LED to pin 5 of Arduino and -ve to GND.

2. Connect the +ve of Yellow LED to pin 6 of Arduino and -ve to GND.

3. Connect the +ve of Green LED to pin 7 of Arduino and -ve to GND.

Circuit schematic- 

Arduino code - 

void setup() {
 pinMode(5,OUTPUT);
 pinMode(6,OUTPUT);
 pinMode(7,OUTPUT);
 Serial.begin(9600); 
}

void loop() {
  
digitalWrite(5, HIGH);
delay(2000);
digitalWrite(5, LOW);
delay(200);
digitalWrite(6, HIGH);
delay(1000);
digitalWrite(6, LOW);
delay(100);
digitalWrite(7, HIGH);
delay(2000);
digitalWrite(7,LOW);
delay(100);

}