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Infrared light may be invisible to the human eye, but its usefulness in the world of electronics is easy to see. From simple object sensors to wireless data transmission, IR emitters and detectors can be used in a variety of different ways. And their low cost and wide availability makes them a great choice for enhancing an electronics project.

Those interested in building their own IR Light Barrier (as demonstrated in the above video) can pick up the relevant PCB/parts kit here.

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Collin Cunningham

Born, drew a lot, made video, made music on 4-track, then computer, more songwriting, met future wife, went to art school for video major, made websites, toured in a band, worked as web media tech, discovered electronics, taught myself electronics, blogged about DIY electronics, made web videos about electronics and made music for them … and I still do!



  1. Anonymous says:

    Debugging tip: Use your cellphone camera to see IR emitters; many can see IR light (at least enough to display something)

    1. Anonymous says:

      I also snagged the IR module from a broken VCR. Add an LED,resistor and a tiny speaker (the VCR had all the parts) and wire it up to a 9V battery. So far the 9V battery hasn’t hurt the IR module.

  2. Anonymous says:

    How timely, I was just investigating IR serial for a cheap device network…