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ir led`s — Parallax Forums

ir led`s

SuperwormsSuperworms Posts: 118
edited 2006-05-28 18:06 in General Discussion
does anyone know the range of ir led and detechers.iin other words how long is the ir led`s range

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2006-05-28 16:26
    That's a loaded question.· A lot can depend on the operating environment.· Since IR is a form of light, if not visible to people, one can still use optics (lenses) to extend range/s.
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2006-05-28 18:06
    superworms,

    As PJ Allen says, this is a loaded question.· A lot can also depend on the detection circuitry used.
    Similar to receiving or tuning in a radio station, the "IR front end" may have an LC tuned to 38kHz.
    With proper filtering, this method of detection can greatly increase your distance range.· You can
    do this with discrete components or to save yourself the headache, some IR detector modules
    have everything built in so you do not need to mess· with the details.· Now if you are using an IR
    frequency other than 38kHz, then the discrete method may be a favorable solution.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
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