//We introduce button constants
int buttonPin = 7;
int buttonState = 0;
int cont = 0;

//We introduce constants of the leds that will make eyes
int cm = 0;
int eyesLEDone = 3;
int eyesLEDtwo = 5;

//insert the 2 pins of the distance sensor
int triggerPin = 2;
int echoPin = A0;


//we introduce the constant of the converter
int transformador = 13;

//code to enter the distance sensor
long readUltrasonicDistance(int triggerPin, int echoPin)
{
 
  pinMode(triggerPin, OUTPUT);
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);

  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);

  return pulseIn(echoPin, HIGH);
}

void setup() {
  cont = 0;
  //initial button status
  Serial.begin(9600);

  pinMode(buttonPin, OUTPUT);

  int buttonState = digitalRead(buttonPin);

pinMode(transformador, OUTPUT);
pinMode(transformador, INPUT);
}


void loop() {

  //button action
  Serial.print("count :");
  Serial.println(cont);
  if (digitalRead(buttonPin) == HIGH) {
    cont++;
    while (digitalRead(buttonPin) == HIGH) {}
  }

  //we define that according to the times that you click the button, it makes different functions
  if (cont == 0) {
    digitalWrite(transformador, HIGH);
  }

  
  else if (cont == 1) {

    //transformer code
    pinMode(transformador, OUTPUT);
    digitalWrite(transformador, LOW);
    delay(100);
    pinMode(transformador, INPUT);
  }
  else if (cont == 2) {
    digitalWrite(transformador, LOW);
    delay(100);
    digitalWrite(transformador, HIGH);
    delay(100);

  }
  else if (cont >= 3) {
    cont = 0;
  }
  
    //we define that if an object is less than the desired distance, the leds that act as eyes are turned on
    cm = 0.01723 * readUltrasonicDistance(2, A0);
    Serial.print ("--------------------");
    Serial.println(digitalRead(cm));
    if (cm <= 100) {
      digitalWrite(eyesLEDone, HIGH);
      digitalWrite(eyesLEDtwo, HIGH);
    }

    if (cm > 100) {
      digitalWrite(eyesLEDone, LOW);
      digitalWrite(eyesLEDtwo, LOW);
    }
  

}