The module typically features a 3-pin male header for easy connection to microcontrollers like Arduino or Raspberry Pi: Description Power Supply 3.3V - 5V DC input. GND Common ground connection. OUT Digital Output Goes LOW when an object reflects IR light. Working Principle
delay(50);
Use a small ceramic screwdriver. Power the module and place a white sheet of paper at your desired detection distance. Turn the pot slowly until the red LED just turns on. Then move the paper 1cm closer/further to verify. Fc 51 Ir Sensor Datasheet