//control LED brightness//

// constants won't change
#define LIGHT_SENSOR_PIN  3  // ESP32 pin GPIO13  connected to light sensor
#define LED_PIN           9  // ESP32 pin GPIO22 connected to LED
#define ANALOG_THRESHOLD  500

void setup() {
  pinMode(LED_PIN, OUTPUT); // set ESP32 pin to output mode
  Serial.begin(9600);
}

void loop() {
  int analogValue = analogRead(LIGHT_SENSOR_PIN); // read the value on analog pin

  if (analogValue < ANALOG_THRESHOLD) {
    digitalWrite(LED_PIN, HIGH); // turn on LED
    Serial.println("LED IS ON"); 
  }
  else {
    digitalWrite(LED_PIN, LOW);  // turn off LED
    Serial.println("LED IS OFF"); 
  }
}