// sygnalizacja swietlna
int carRed = 12;
int carYellow = 11;
int carGreen = 10;
int pedRed = 9;
int pedGreen = 8;
int button = 2;
int crossTime = 5000;
unsigned long changeTime;
int trigPin = 5;
int echoPin = 6;

void setup() {

  pinMode(carRed, OUTPUT);
  pinMode(carYellow, OUTPUT);
  pinMode(carGreen, OUTPUT);
  pinMode(pedRed, OUTPUT);
  pinMode(pedGreen, OUTPUT);
  pinMode(button, OUTPUT);
  digitalWrite(carGreen, HIGH);
  digitalWrite(pedRed, HIGH);
  pinMode(A5, OUTPUT);

  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

}

void loop ()
{

  int state = digitalRead(button);
  if( state == HIGH && (millis() - changeTime) > 300)
  {
    changeLight();
  }

  long czas, dystans;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  czas = pulseIn(echoPin, HIGH);
  dystans = czas / 58;

  if( dystans >= 2 && dystans <= 20)
  {
    changeLight();
  }

}


void changeLight()
{
  digitalWrite(carGreen, LOW);
  digitalWrite(carYellow, HIGH);
  delay(2000);

  digitalWrite(carYellow, LOW);
  digitalWrite(carRed, HIGH);
  delay(3000);

  digitalWrite(pedRed, LOW);
  digitalWrite(pedGreen, HIGH);


  for( int x=0 ; x<18 ; x++)
{
  digitalWrite(A5, HIGH);
  delay(150);
  digitalWrite(A5, LOW);
  delay(150);
}


  for( int x=0 ; x<15 ; x++)
  {
    digitalWrite(pedGreen, HIGH);
    digitalWrite(A5, HIGH);
    delay(110);
    digitalWrite(pedGreen, LOW);
    digitalWrite(A5, LOW);
    delay(110);
  }

  digitalWrite(pedRed, HIGH);
  delay(1500);

  digitalWrite(carYellow, HIGH);
  digitalWrite(carRed, LOW);
  delay(1000);
  digitalWrite(carGreen, HIGH);
  digitalWrite(carYellow, LOW);

  changeTime = millis();

}