#define LDR_pin A0
#define LED 2
void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}
void loop() {
  int LDR_value = analogRead(LDR_pin);
  Serial.println(LDR_value);
  if(LDR_value<70){
    digitalWrite(LED,1);
  }
  else {
    digitalWrite(LED,0);
  }
}