int SwitchState(0);
void setup() {
pinMode(5,OUTPUT); //green light
pinMode(4,OUTPUT); //yellow light
pinMode(3,OUTPUT); //red light
}
void loop() {
digitalWrite(5,HIGH);
digitalWrite(4,LOW);
digitalWrite(3,LOW);
delay(3000);
digitalWrite(5,LOW);
digitalWrite(4,HIGH);
digitalWrite(3,LOW);
delay(3000);
digitalWrite(5,LOW);
digitalWrite(4,LOW);
digitalWrite (3,HIGH);
delay(3000);
digitalWrite(5,HIGH);
digitalWrite(4,LOW);
digitalWrite(3,LOW);
delay(3000);
}