#define LDR 34
#define BLUE 2

void setup() {
  Serial.begin(115200);
  pinMode(LDR, INPUT);
  pinMode(BLUE, OUTPUT);
}

void loop() {
  if(digitalRead(LDR)){
    digitalWrite(BLUE,HIGH);
    Serial.println("NIGHT");
  }else{
    digitalWrite(BLUE,LOW);
    Serial.println("DAY");
  }
}