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Intelligent fan

Discussion in 'Electronic Design' started by eeh, Jul 12, 2005.

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  1. eeh

    eeh Guest


    I have an idea. I want to make a electronic fan which can recognize
    whether there is a human in front of it. If yes, it can be
    automatically turned on, and if he/she is away, it will automatically
    turned off after one minute. I have this idea because I also want such
    a device as I always leave my seat and it is very trouble to turn on
    and off the fan everytime I leave or return. I know PIR alone or
    thermopile alone cannot do this job.

  2. w2aew

    w2aew Guest

    Of course you "could" build something - but a simply solution probably
    exists at your home center. Pick up one of the IR motion sensors that
    is used to control outside motion-sensing lights. You can buy these
    modules separately (pretty cheap too), and simply wire it up into a
    junction box and plug your fan into it, then set the sensitivity as
    required. Will probably work fine.
  3. Genome

    Genome Guest

    Unless you are a cripplefuck I don't understand your question. If you are a
    cripplefuck then I'd have no problem with you leaving your fan on all the
    time, you can have a new one when it wears out. In fact if you want to save
    me some money on electricity whilst you motor off to recharge your wheel
    chair you may ask someone else to turn off your fan until you get back.

    I cannot gaurantee that someone else hasn't nipped in and nicked your fan
    whilst you were away.

    People are shit that way.

  4. John Fields

    John Fields Guest

    I have an idea; you could do it with speech recognition!

    First, build a speech recognition module with a one minute timer on
    it, and train it to turn off the fan if if doesn't hear "Ouch!!!"
    every minute.

    Then, fix up your chair so that the timer from the SRM (Speech
    Recognition Module) fires a solenoid with a big, sharp plunger right
    through the chair' cushion into your butt.

    Now, when the plunger hits your ass, and you holler "OUCH!!!" the SRM
    will regognize it and will let the fan stay on for another minute.
    However, if you don't holler, the SRM will assume you're away and turn
    off the fan. It'll keep on firing the solenoid, though, so that if it
    hears you holler right after it fires the solenoid it'll know you're
    back and it'll turn on the fan again.
  5. Paul Burke

    Paul Burke Guest

    To recognise a human, as distinct from a human- sized object, a robot, a
    gorilla or an alien, you need to detect something which is
    characteristic of humans, but which the others don't have.

    Perhaps an infra red themometer measuring a temperature of 37C- no,
    that's the core temperature, you'd need a probe mounted vertically on
    the seat...

    Brain activity... No, too many humans wouldn't activate it.

    A guilt detector might be useful.

    But the one that seems most characteristic is the unique attribute that
    only humans have- the soul. You'll need to ask theologians or creation
    scientists about how exactly to do it, but I expect a dowsing rod would
    help. This method would also be useful, in that whenever someone DIDN'T
    turn the fan on, you'd know they were not human, and you could promote
    them to head of department.

    Paul Burke
  6. Ian Stirling

    Ian Stirling Guest

    Pressure sensor under the seat.
    Depending on the design of seat, you may be able to get away with a
    simple switch to sense the rise/fall of the seat when sat on.
  7. Rich Grise

    Rich Grise Guest

    Install a dead-man switch on the fan, with a leash you your wrist.
    When you get up to go pee, you pull out the plug and the fan stops.
    Or you could rig up a 1-minute timer, triggered by the dead-man switch.
    Then, when you get back, plug in the dead-man leash, and the fan
    will start again.

    Good Luck!
  8. Rich Grise

    Rich Grise Guest

    Oh, find a medicine man with a dream catcher, a new-age witch with
    a spirit catcher, a magnetometer, and an electrometer. Maybe a fluxgate
    and capacitive sensor. With a little thought and feeling, there should
    be almost nothing to it. ;-)

    Designing the actual decoding circuitry is, of course, left as an exercise
    for the student.

    Good Luck!
  9. Bob Monsen

    Bob Monsen Guest

    google for GP2D12

    Bob Monsen

    If a little knowledge is dangerous, where is the man who has
    so much as to be out of danger?
    Thomas Henry Huxley, 1877
  10. Fred Abse

    Fred Abse Guest

    Only works with Catholics.

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