/*
control led brightness
 */

#define POTENTIOMETER_PIN 35 //ESP32 pin connected to pontentiometer pin 
#define LED_PIN           22 //ESP32 pin connected to LED pin
#define BUZZER_PIN        21 //ESP32 pin connected to BUZZER pin
#define ANALOG_THRESHOLD   1000

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600) ;

  //declare LED pin to be an output:
  pinMode(LED_PIN,  OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  // reads input on analog pin A0
  int analogvalue = analogRead(POTENTIOMETER_PIN);

  //scales it to brightness (value between 0 - 255)
  int brightness = map(analogvalue, 0, 4095, 0, 255);

  //set the brightness LED that connect to pin 3
  analogWrite(LED_PIN, brightness);

  //print out the value
  Serial.print("Analog value = ");
  Serial.print(analogvalue);
  Serial.print(" => brightness = ");
  Serial.println(brightness);
  delay(100);
  tone(21, 262, 250);
  if (analogvalue > ANALOG_THRESHOLD)
    digitalWrite(BUZZER_PIN, HIGH); //turn on piezo Buzzer
    else
    digitalWrite(BUZZER_PIN, LOW); //turn off piezo BUzzer
}