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int photoRPin= 0; int lightLevel; int led=13; int led2=12;   void setup(){  pinMode(led,OUTPUT); Serial.begin(9600); lightLevel=analogRead(photoRPin);  }  void loop(){  lightLevel=analogRead(photoRPin); Serial.println(lightLevel); if (lightLevel<100) {   digitalWrite(led,HIGH); //    digitalWrite(led2,LOW);      } else {   digitalWrite(led,LOW); //      digitalWrite(led2,HIGH);    }   delay(50);  }