int carRed = 2; //car lights being assigned
int carYellow = 3;
int carGreen = 4;
int pedRed = 9; //ped lights being assigned
int pedGreen = 10;
int button = 12; // button pin
int crossTime = 5000;  //crossing time given to pedestrians
unsigned long changeTime ; // collects the time since the button was last pressed
void setup () {
  pinMode(carRed, OUTPUT);
  pinMode(carYellow, OUTPUT);
  pinMode(carGreen, OUTPUT);
  pinMode(pedRed, OUTPUT);
  pinMode(pedGreen, OUTPUT);
  pinMode(button, INPUT);
  digitalWrite(carGreen, HIGH); //start with green car light on
  digitalWrite(pedRed, HIGH); //start with red ped light on
}
void loop() {
  /* check if button is pressed
   and it is over 5 sec since last button press*/
  int state = digitalRead(button);
  if (state == HIGH && (millis() - changeTime) > 5000) {
    changeLights();  //function to change lights
  }
}
void changeLights() {
  digitalWrite(carGreen, LOW); //green car light off
  digitalWrite(carYellow, HIGH); // yellow car light on
  delay(2000); //wait 2 seconds
  digitalWrite(carYellow, LOW); // yellow car light off
  digitalWrite(carRed, HIGH); //red car light on
  delay(1000); //wait 1 second to turn on ped light
  digitalWrite(pedRed, LOW); //red ped light off
  digitalWrite(pedGreen, HIGH); //green ped light on. Allow crossing
  delay(crossTime); //delay preset time of 5 seconds

  //flashing of ped green light
  for (int x = 0; x < 10; x++) {
    digitalWrite(pedGreen, HIGH);
    delay(250);
    digitalWrite(pedGreen, LOW);
    delay(250);
  }
  digitalWrite(pedRed, HIGH); //turn red ped light on
  delay(100);
  digitalWrite(carGreen, HIGH); //car green light on
  digitalWrite(carRed, LOW); //car red light off
  changeTime = millis(); //record time since last lights change
}