//program for traffic lights using led:

const int red = 13;
const int green = 12;
const int yellow = 11;
void setup() {
  // put your setup code here, to run once:
pinMode(yellow,OUTPUT);
pinMode(green,OUTPUT);
pinMode(red,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(red, HIGH);
digitalWrite(yellow, LOW);
digitalWrite(green, LOW);
delay(5000);
digitalWrite(yellow, HIGH);
digitalWrite(green, LOW);
digitalWrite(red, LOW);
delay(2000);
digitalWrite(green, HIGH);
digitalWrite(yellow, LOW);
digitalWrite(red, LOW);
delay(5000);
}