int redled = 13;
int yellowled = 12;
int greenled = 8;

int pedestrianbtn = 2;

void setup() {
  pinMode(redled, OUTPUT);
  pinMode(yellowled, OUTPUT);
  pinMode(greenled, OUTPUT);

  digitalWrite(redled, LOW);
  digitalWrite(yellowled, LOW);
  digitalWrite(greenled, LOW);

  pinMode(pedestrianbtn, INPUT);

  Serial.begin(9600);
}

void loop() {
  digitalWrite(redled, LOW);
  digitalWrite(greenled, HIGH);
  Serial.println("(GREEN) GO!");
  greenLight();

  digitalWrite(greenled, LOW);
  digitalWrite(yellowled, HIGH);
  Serial.println("(YELLOW) GET READY TO STOP! ");
  delay(2000);

  digitalWrite(yellowled,LOW);
  digitalWrite(redled, HIGH);
  Serial.println("(RED) STOP!");
  delay(10000);

}

void greenLight()  {
  for (int i = 1; i < 16; i++) {
    int state = digitalRead(pedestrianbtn);

    if (state == 0) {
      Serial.print(i);
      delay(1000);
      Serial.print(", ");
    }
    else if (state == 1){
      Serial.print("PEDESTRIAN BUTTON PRESSED");
      delay(5000);
      return;
    }
  }
}