#define DARK HIGH
#define LIGHT LOW

const int LDR_PIN = 16 ;
const int RELAY_PIN = 15 ;

void setup() {
  Serial.begin(115200);
  pinMode(LDR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
}

void loop() {
  int lightState = digitalRead(LDR_PIN);
  if (lightState == DARK){
    Serial.println("Dark!");
    digitalWrite(RELAY_PIN, HIGH);
  }else {
    Serial.println("Light!");
    digitalWrite(RELAY_PIN, LOW);
  }
  
}