#define TOUCH_PIN 4
#define LED_PIN   5

int previousState = -1;

void setup() {
  Serial.begin(115200);

  pinMode(TOUCH_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  digitalWrite(LED_PIN, LOW);

  Serial.println("TTP223B - Sensore pronto");
}

void loop() {
  int touchState = digitalRead(TOUCH_PIN);

  if (touchState != previousState) {

    if (touchState == HIGH) {
      Serial.println("TOCCO RILEVATO!");
      digitalWrite(LED_PIN, HIGH);
    }
    else {
      Serial.println("TOCCO RILASCIATO");
      digitalWrite(LED_PIN, LOW);
    }

    previousState = touchState;
  }

  delay(50);
}