IR proximity Sensor without IC

IR proximity Sensor without IC

Component required:

  • LED
  • IR LED
  • IR photodiode
  • 4v battery
  • Buzzer



As any object comes in front of the sensor the buzzer gets on. It happens because the infrared light emit by the ir led received by the receiver led after reflection from the object surface.


  • Obstacle detector
  • Automatic dryer or valve
  • Line following or path following robots