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Velleman MK120 IR Light Barrier Kit

MK120: VELLEMAN INC. View Larger Image
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Jameco Part no. 2131012
Manufacturer VELLEMAN INC.
Manufacturer no. MK120
  RoHS compliant
Catalog 161 , page 140
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25+ $9.95
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Velleman MK120 IR Light Barrier Kit

Velleman MK120 IR Light Barrier Kit

The IR (infrared) light barrier kit contains an IR emitting module and an IR receiver module with an LED indicator and buzzer. As long as the receiver is detecting the IR light from the emitter, it will remain silent. When something breaks the beam, the LED on the receiver module will turn on and the speaker will sound. This kit is similar to the door chime you hear when you enter a convenience store. Check out the video demo below.


  • Factory assembly line
  • Announce visitors
  • Warn against burglars
  • Set boundaries
  • Use in science projects, etc.


  • Audible (85dB) and visible (LED) alert
  • Range: 3.3ft to 13ft
  • On/off switch provided

    Power Supply:

  • Transmitter: 9V DC / 50mA max.
  • Receiver: 9V DC / 20mA max.
  • 9V battery holder and adapter jack included. 9V batteries (sold separately).


  • Transmitter: 2.2" x 1.6"
  • Receiver: 3.9" x 2.0"

    Note: Not recommended for outdoor use (the sun emits a lot of IR!).


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