ESP32-Touch.ino

// Touch pin cutoff value
#define CUTOFF 20

// Amount of time held before touch fires event (ms)
#define DURATION 100

// Touch state (0=none, 1=touched+waiting, 2=touched+sent)
int state;
int start;

void setup() {
  Serial.begin(115200);
  state = 0;
}

void loop() {
  const int t = millis();
  const int value = touchRead(T0);
  const bool touched = (value < CUTOFF);
  if (state > 0) {
    if (state == 1 && t - start > DURATION) {
      state = 2;
      Serial.println("touch");      
    } else if (!touched) {
      state = 0;
    }
  } else {
    if (touched) {
      state = 1;
      start = t;
    }
  }
  delay(25);
}