/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-light-sensor
 */

// constants won't change

// LDR Initial
#define LIGHT_SENSOR_PIN  35  // ESP32 pin GIOP35 (ADC0) connected to light sensor
#define LED_PIN           22  // ESP32 pin GIOP22 connected to LED
#define ANALOG_THRESHOLD  500

int LDR_detection () {
  delay(1000);
  int analogValue = analogRead(LIGHT_SENSOR_PIN); // read the value on analog pin
  if (analogValue < ANALOG_THRESHOLD) {
    return 4;  // When the LDR detect dark
  }
  else {
    return 5;  // when the LDR detect bright
  }
}

void setup() {
  // LDR Setup
  pinMode(LED_PIN, OUTPUT); // set ESP32 pin to output mode
}

void loop() {
  if (LDR_detection() == 4) {
    digitalWrite(LED_PIN, HIGH); // turn on LED
  }
  else if (LDR_detection() == 5) {
    digitalWrite(LED_PIN, LOW);  // turn off LED
  }
  else {
    Serial.println("LDR Detection Error!!!");
  }
}