const int LDR_PIN = 7;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int ldr_value = digitalRead(LDR_PIN);
  Serial.print("LDR value: ");
  Serial.println(ldr_value);
  delay(1000); 
}