simple-activated-light.ino

int greenPin = 4;
int yellowPin = 5;
int redPin = 6;

int greenPin2 = 9;
int yellowPin2 = 10;
int redPin2 = 11;

int sensorPin = A0;

void setup() {
  pinMode(greenPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(redPin, OUTPUT);

  pinMode(greenPin2, OUTPUT);
  pinMode(yellowPin2, OUTPUT);
  pinMode(redPin2, OUTPUT);

  // start with green on the thoroughfare and red on the side street.
  digitalWrite(greenPin, HIGH);
  digitalWrite(redPin2, HIGH);
}

void loop() {
  if (analogRead(sensorPin) < 500) {
    // go to yellow and red on the thoroughfare.
    digitalWrite(greenPin, LOW);
    digitalWrite(yellowPin, HIGH);
    delay(3200);
    digitalWrite(yellowPin, LOW);
    digitalWrite(redPin, HIGH);
    delay(1000);

    // go to green on the side street.
    digitalWrite(redPin2, LOW);
    digitalWrite(greenPin2, HIGH);
    delay(10000);
    
    // go to yellow and red on the side street.
    digitalWrite(greenPin2, LOW);
    digitalWrite(yellowPin2, HIGH);
    delay(3200);
    digitalWrite(yellowPin2, LOW);
    digitalWrite(redPin2, HIGH);
    delay(1000);
    
    // go back to green on the thoroughfare
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
  }
}