#define LDR 2 // ESP32 pin GIOPD2 (ADC0)
int a=18;
int b=5;
int c=4;

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(115200);
  pinMode(a, OUTPUT );
  pinMode(b, OUTPUT );
  pinMode(c, OUTPUT );
}

void loop() {
  // reads the input on analog pin (value between 0 and 4095)
  int analogValue = analogRead(LDR);

  Serial.print("Analog Value = ");
  Serial.print(analogValue);  

 if (analogValue < 40)
  { 
    digitalWrite(a, HIGH);
    digitalWrite(b, HIGH);
    digitalWrite(c, HIGH);
    Serial.println(" => Bright");
  } 
  else if (analogValue < 800)
   {
     digitalWrite(a, HIGH);
     digitalWrite(b, HIGH);
     digitalWrite(c, LOW);
    Serial.println(" => Light");
  }
   else if (analogValue < 2000) 
   {
     digitalWrite(a, HIGH);
     digitalWrite(b, LOW);
     digitalWrite(c, LOW);
    Serial.println(" => Dim");
  } 
  else if (analogValue < 3200) 
  {
     digitalWrite(a, LOW);
     digitalWrite(b, LOW);
     digitalWrite(c, LOW);
    Serial.println(" => Bright");
  }
   else {
    Serial.println(" => Very bright");
  }

  delay(500);
}