#define LIGHT_SENSOR_PIN 14 // ESP32 pin GIOP14 (ADC0)
void setup () {
 // initialize serial communication at 9600 bits per second:
 Serial.begin(9600);
}
void loop() {
 // reads the input on analog pin (value between 0 and 4095)
 int analogValue = analogRead(LIGHT_SENSOR_PIN);
 Serial.print("Analog Value = ");
 Serial.print(analogValue); // the raw analog reading
 // We'll have a few threshholds, qualitatively determined
 if (analogValue < 40) {
 Serial.println(" => Dark");
 } else if (analogValue < 800) {
 Serial.println(" => Dim");
 } else if (analogValue < 2000) {
 Serial.println(" => Light");
 } else if (analogValue < 3200) {
 Serial.println(" => Bright");
 } else {
 Serial.println(" => Very bright");
 }
 delay(1000);
}