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A simple transmitter / reciever help

Discussion in 'General Electronics' started by Gavin, Jan 12, 2004.

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  1. Gavin

    Gavin Guest

    Hello All,

    I'm bored at the moment so I have thought up a little project that
    could be interesting for me.

    Any way, I have noticed that My gf and I are always leaving the
    bathroom light on all day so, I have devised a fiendish device that
    will transmit a signal via radio to a receiver next to the front door
    and show an LED when the light is on.

    Sounds easy, but I have not got a clue where I can get radio
    transmitter / recover that will do what I need. Do any of you know?

    I've kind of got the circuit that I need in my head and was hoping to
    just have a relay of sort to tell the transmitter to send. Once done
    the receiver will switch on show the light. When the light is off the
    transmitter will fire again and switch the LED off.

    Any help will be appreciated.
  2. GPG

    GPG Guest

  3. Quack

    Quack Guest

    I've kind of got the circuit that I need in my head and was hoping to
    I'd tackle it a bit differently.

    The receiver would be setup to light its LED while receiving a signal
    only - if the signal disappears, led goes off.

    The transmitter would be setup to send the signal full-time, no matter
    what - but only while it has power of course, so just wire its power
    supply in with the bathroom light.

    Im not sure of the cheapest solution here ..

    but i have a few parallax wireless serial transeivers and basic stamps
    lying around which i would probably use if i was gonna do it. (not
    cheap though).
    And then it would need to 'poll' because there is no 'connection

  4. Since I don't want people coming to my door to know the status of my
    bathroom light (or asking what the light is about), I simply have a
    switch that senses people in the bathroom and turns off the light
    itself. Works great with a 4 year old and is $15. Sorry. I tend to
    change the game.
  5. Why not install a proximaty switch in the bathroom, with about a 10
    mminute delay, so that there will be no false shutoffs? When the
    person leaves, the light will go out after 10 minutes.

    Jerry Greenberg
  6. Sounds easy, but I have not got a clue where I can get radio
    Have you considered using an RF solutions transmitter and reciver
    pair. They are single modules that use the licence free (at least in
    EU) 433Mhz band and are designed to work together so no tuning. They
    also make a load of interface chips that send up to 15 states. I have
    used them before and all they need is an aerial and an encoder chip.

    datasheets at
  7. HaCv

    HaCv Guest

    There are good rf solutions from, very simple to operate
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