#define LED 2
#define TOUCH 4

int limiar = 50;

void calibracao(void) {
  int val=0;
  Serial.print("Iniciarndo calibracao");
  Serial.println("Nao toque no fio");

  for (int i = 0; i<100;i++){
    val += touchRead(TOUCH);
    delay(10);
  }
  //media de val
  int media= val / 100;
 
  //calcular os 30%
  limiar= media * 0.7;
  Serial.println("Calibracao finalizada.");
  return;
}

void setup() {
  Serial.begin(115200);
  delay(1000);

  Serial.println("ESP32 Touch com LEDs");
  pinMode(LED, OUTPUT);

  calibracao();
  Serial.print("O valor de limiar é: ");
}

void loop() {
  int touchValue = touchRead(4);
  Serial.println(touchValue);
  if (touchValue < limiar) {
    digitalWrite(LED, HIGH);
  } else{
    digitalWrite(LED, LOW);
  } 
  delay(300);
  
}