#define ldr 15
void setup() 
{
  Serial.begin(115200);
  pinMode(2, INPUT);
  pinMode(5, OUTPUT);
}
void loop() 
{
 int LDR=analogRead(ldr);  //local variable
  if(LDR>1121)    //low light 
 {
  digitalWrite(5, HIGH);
 }
  if(LDR<1120) //high light 
  {
    digitalWrite(5,LOW);
  }
  int Light =digitalRead(5);
  
 Serial.println("value:");
 Serial.println(LDR);
 Serial.println(Light);
  delay(5000);
 }