ldr-nodemcu.ino

/*
 * AJ Alves (aj.alves@zerokol.com)
*/
int ANALOG_PIN = A0; // The NodeMCU Analogic Pin
int BOARD_RESOLUTION = 1024 ; // The analogic board resolution, for example NodeMCU ESP8266 is 10 bit (from 0 to 1023)
int val = 0; // A varaible to hold the value

void setup() {
  Serial.begin(9600); // Serial Port setup
}

void loop() {
  val = analogRead(ANALOG_PIN); // Reading from analogic pin
  if (val < BOARD_RESOLUTION / 2) {
    Serial.println("It is DARK!");
  } else {
    Serial.println("It is LIGHT!");
  }
  delay(1000); // Wait 1 second
}