// constants won't change. They're used here to set pin numbers and threshold:
const int ledPin = 12;
const int touchPin = 13; // D4 = TOUCH0
const int buzzerPin = 14;
const int touchThreshold = 20;

int freq = 300;
int channel = 0;
int resolution = 8;

// variables will change:
int touchVal = 0; // variable for reading the touch sensor status

void setup() {
  Serial.begin(115200);
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // pinMode(buzzerPin, OUTPUT);
  
  ledcSetup(channel, freq, resolution);
  ledcAttachPin(buzzerPin, channel);
}

void loop() {
  // read the value of the touch sensor:
  touchVal = touchRead(touchPin);
  // Serial.println(touchVal);

  ledcWriteTone(channel, freq);

  // check if the sensor is in touch:
  if (touchVal < touchThreshold) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
    ledcWrite(channel, 255);
    // digitalWrite(buzzerPin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
    ledcWrite(channel, 0);
    // digitalWrite(buzzerPin, LOW);
  }
  delay(200);
}