#include <Servo.h>

Servo myServo;

int ldrPin = D1;    // your connection
int servoPin = D0;

int threshold = 500; // adjust it

void setup() {
  myServo.attach(servoPin);
  Serial.begin(115200);
}

void loop() {
  int ldrValue = analogRead(ldrPin);
  Serial.println(ldrValue);

  if (ldrValue > threshold) {
        myServo.write(180); // light
  } else {
        myServo.write(0);   // darkness
  }

  delay(100);
}