void setup()
{
Serial.begin(115200);
// traffic light 1
pinMode(27, OUTPUT);
pinMode(14, OUTPUT);
pinMode(12, OUTPUT);
pinMode(18, OUTPUT);
//Traffic light 2
pinMode(21, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(19, OUTPUT);
}
void loop()
{
digitalWrite(27,HIGH);
digitalWrite(21,HIGH);
digitalWrite(18,HIGH);
delay(1500);
digitalWrite(27,LOW);
digitalWrite(21, LOW);
digitalWrite(18, LOW);
delay(1500);
digitalWrite(14, HIGH);
digitalWrite(5, HIGH);
delay(1500);
digitalWrite(14, LOW);
digitalWrite(5, LOW);
delay(1500);
digitalWrite(12, HIGH);
digitalWrite(4, HIGH);
digitalWrite(19, HIGH);
delay(1500);
digitalWrite(12, LOW);
digitalWrite(4, LOW);
digitalWrite(19, LOW);
delay(1500);
}