Light Switch Arduino Sensor for Relay

LightSwitch.ino

#define LIGHT_PIN D6 // 0 = LIGHT | 1 = DARK

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

void loop() {
  Serial.println(light());
}

int light()
{
  pinMode(LIGHT_PIN, INPUT);
  return digitalRead(LIGHT_PIN);
}