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How to reduce IR sensitivity

Discussion in 'Electronic Repair' started by Father Guido, Jul 15, 2008.

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  1. Father Guido

    Father Guido Guest

    I have an IR operated garbage can, trouble is the sensor is too
    sensitive and it opens whenever you walk by. How can I reduce the
    sensitivity of the IR receiver so I have to put my hand very close to
    the sensor before the lid opens?

    tia
     
  2. N_Cook

    N_Cook Guest


    Try various thicknesses of different plastics , clear or opaque, but not
    polythene, over the sensor
     
  3. Arfa Daily

    Arfa Daily Guest

    Or different colours of electricians' self-adhesive PVC tape.

    Arfa
     
  4. Adrian C

    Adrian C Guest

    Or drink loads of chilled beer to lower ye body temperature....
     
  5. Ian Jackson

    Ian Jackson Guest

    That type of Selotape which is translucent milky white on the reel, but
    almost invisible when used, is pretty good. Just use as many layers as
    are required to obtain the required sensitivity. It also works well for
    annoyingly high-intensity LED indicators on the front of STBs and the
    like.
     
  6. Sjouke Burry

    Sjouke Burry Guest

    Partly cover the pickup?
     
  7. Father Guido

    Father Guido Guest

    Hi, thanks for the tips, they all make some
    sense to me. I'll try them out as I get materials!

    Thanks again,

    Norm
     
  8. Guest

    try clear tape
     
  9. Jerry G.

    Jerry G. Guest

    I have used black electrical tape. I start by partialy covering the
    sensor window, and increasing how much it is covered to reduce the
    sensitivity.

    Jerry G.
     
  10. GregS

    GregS Guest


    We used to use exposed Kodachrome. Got any bad old slides ??

    greg
     
  11. Thor

    Thor Guest

    I haven't seen it suggested yet, you could try breaking open a floppy disk and
    use the media as a filter. The media in a floppy lets IR through, just not so
    well and it sounds like what you are after.

    I just checked it with an image converter, you may need a few layers.



    Thor
     
  12. Father Guido

    Father Guido Guest

    I've tried various amounts of scotch tape, but just putting the tape
    over the sensor activates it, and it never resets. I.e. I turned the
    device off, placed tape over sensor in varying levels and positions
    but when I turn the device on, it opens and refuses to close. Sigh.

    I look at some of the other suggestions, thanks for your help!

    Norm
     
  13. New Jersey

    New Jersey Guest

    have tried aluminum or stainless foil/tape
     
  14. mike

    mike Guest

    do you know how it works?
    I'd expect it to be passive, but the tape keeping it on
    suggests active?
    If it's passive, there needs to be some means to track
    ambient conditions and react to change.
    Attenuation will decrease SNR but probably not
    do what you want.
    I'd look at baffles/reflective surfaces to point the
    detection
    zone away from where you are.

    The low-tech solution might be to rotate the can.

    Or fill it with cold beer. Then you'd want it to open
    when you go by. If the tool don't fit the job,
    change the job...

    Better yet, take out the batteries. Some things just
    don't benefit from automation. ;-)
    mike
     
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