/*
  Activity 4: Light Sensor (LDR) Control
  Purpose: Turn on the LED automatically when it gets dark
  Uses an LDR (Light Dependent Resistor) connected to ADC pin
  Threshold can be adjusted based on ambient light conditions
  
  Components:
  - ESP32 Dev Module
  - LDR (Light Dependent Resistor) connected to GPIO 34
  - LED connected to GPIO 2
  - 10kΩ resistor (voltage divider for LDR)
*/

#define PIN_LDR 34
#define PIN_LED 2

int valorLDR = 0;
// Adjust this value according to your environment
int umbralOscuridad = 3900;

void setup() {
  Serial.begin(115200);
  pinMode(PIN_LED, OUTPUT);
  digitalWrite(PIN_LED, LOW);
}

void loop() {
  valorLDR = analogRead(PIN_LDR);
  Serial.print("LDR Value: ");
  Serial.println(valorLDR);
  
  if (valorLDR > umbralOscuridad) {
    digitalWrite(PIN_LED, HIGH);  // Darkness: turn LED ON
  } else {
    digitalWrite(PIN_LED, LOW);   // Light: turn LED OFF
  }
  delay(300);
}