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how to transmit IR data up to 100 ft outdoor and over?

Discussion in 'Electronic Design' started by blisca, Mar 25, 2007.

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  1. blisca

    blisca Guest

    Hi,i'm intereted in learning how to preamplify infrared signals for such a
    long distances.I know about the photomodules commonly used in TV's and
    VCR's,they have good sensibility,appears they don't saturate if exposed to
    the sun light,but the common europeans types,as TSOP 38 and so on appears
    slow to my needs.In fact they decode a burst of too many pulses,while i
    would recognize a pattern of few pulses at frequency of tenth of KHZ .I
    tried to build at home some IR preamps,with autobias (to be immune to sun )
    but no AGC or bandpass filter,being limited by space.I had some results
    using a cheap opamp,a scraped op213,it has a 3.4 MHz Gb ,it works but is not
    enough for my needs.Can anyone suggest me a site talking about how to
    preamplify an IR signal ?
    Many thanks .
  2. Mitch__

    Mitch__ Guest

    try using laser

  3. ziro_axis

    ziro_axis Guest

    The IR have range of frequency if you work near the end of the range
    it will give you longer distance but for outdoor i'm not sure of the
    quality i.e. near the end of the range maybe you get interference, so
    if you allow me, can I know more about your application?
  4. blisca

    blisca Guest

    ty mike,but i should avoid laser ,invisible IR laser could be harmful to the
  5. blisca

    blisca Guest

    yes ,a couple of friends ,amateur racing car drivers,asked me something able
    to transmit a short pattern from boxes to car ,in very little time(100th of
    second), i can't use laser because IR laser can harm the eye and it is
    possible that on the other side of the track there is some people watching
    in front of the beam

    ty for help.
  6. dalai lamah

    dalai lamah Guest

    Un bel giorno blisca digitò:
    Applications like this are usually done with radio communications.
  7. Not a problem if you keep it to Class 1 limits.
  8. blisca

    blisca Guest

  9. joseph2k

    joseph2k Guest

    I think for those conditions i would use either DSRC or ISM radio. Possibly
    bluetooth or Wi-Fi.
  10. blisca

    blisca Guest


    Thank you but can one of this methods be so focusized as light does?
  11. joseph2k

    joseph2k Guest

    Why would it be useful to use such a narrow beam?
  12. blisca

    blisca Guest

    because it acts like a chronometer too
  13. joseph2k

    joseph2k Guest

    Then you have two previously unstated issues: 1. doing an unstated added
    task; 2. mixing unrelated tasks in a single device.
    Leaving requirements out when you ask for help will just guarantee that you
    get inappropriate results.
  14. blisca

    blisca Guest

    Yes,you are totally right
  15. JeffM

    JeffM Guest

    Altering the Subject line to indicte how deeply
    your post is nested in the thread is COMPLETELY unnecessary.
  16. Alex

    Alex Guest

    tried to build at home some IR preamps,with autobias (to be immune to sun )
    Is the sender and reciver firm placed ?- then maybe a parabola on
    both parts could help with increasing signal.
    A lens or parabola will lower the ambient lights influence in most

    Now I wonder ;Is it possible to use some kind of polarisation filter
    for IR ??? to remove reflections and ambient light ???
  17. Properly encoded signals should not be affected and a laser transmitter
    should need no such filter.
  18. blisca

    blisca Guest

    I don't understand wher is my error.Can you copy and paste the previous
    message to show how my post should have been and where the error is?
  19. blisca

    blisca Guest

    Yes ,the optical way seems resolutive,even a cheap lens used in the so
    called "3rd hand" with alligator clips almost doubles the distance ,once
    positioned at a couple of inches from the emitting IR diode.
    I just am curious about the method used inside the common infrared
    photomodules,i know they have bandpass filter and agc ,but i would like to
    know the way they works.
  20. JeffM

    JeffM Guest

    Your last Subject line reads
    R: R: R: R: how to transmit IR data up to 100 ft outdoor and over?

    Your most recent Subject line reads
    Re: R: how to transmit IR data up to 100 ft outdoor and over?

    The additionional **R's** are not necessary.
    If your software is automatically adding them,
    you need to reconfigure it.

    If you are manually adding the just stop it.
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