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RF Wireless transmitter/receiver

Discussion in 'Electronic Design' started by Russell Fray, Oct 31, 2004.

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  1. Russell Fray

    Russell Fray Guest


    I need to build a circuit for my alarm that will send a signal to one of
    four boxes, connected wirelessly. Basically I need to have a box with four
    inputs, and depending on which input is triggered, it will send a signal to
    one of four receiver boxes so I can program a task to be performed.

    The size of the transmitter is not too important, but the receiver boxes
    must be as small as possible. Range only needs to be about 10 metres but
    cannot be IR, must be RF to work through thin walls.

    I have no problem sorting out the rest of the circuit so basically need a
    little advice on what would be the smallest and cheapest way to have a
    single transmitter box that can send signals on multiple channels separately
    so only one receiver box will react to the signal depending on what is

    I am based in the UK if that's important for component codes / recommended

    Thanks very much in advance for your time,
  2. Don Pearce

    Don Pearce Guest

    Go to a model shop and look at radio control stuff for model planes

    Pearce Consulting
  3. Rich Grise

    Rich Grise Guest

    You could also look at "X-10", which is a wireless home control system
    that sends signals out the power lines.

    Good Luck!
  4. Russell Fray

    Russell Fray Guest

    You could also look at "X-10", which is a wireless home control system
    It really needs to be wireless RF and I'm still a bit stuck...

    Imagine it more like this;

    Transmitter : Big black box with 5 buttons (for ease of setting up)

    Press button 1 on transmitter : Receiver 1 activates

    Press button 2 on transmitter : Receiver 2 activates

    Press button 3 on transmitter : Receiver 3 activates

    Press button 4 on transmitter : Receiver 4 activates

    Press button 5 on transmitter : Receiver 5 activates

    So I need one transmitter that will send a signal which activates one of 5
    physically separate boxes.

    It has to be small and cheap, something like a remote for an aeroplane is
    very expensive and way more than I need, I don't need analogue signals just
    a plain "on or off" signal. Also there would only be one receiver, accepting
    all channels. It only needs to receive a signal, so doesn't need to be two

    I need a transmitter that can send on different channels, then a receiver
    that will receive on only one channel, and each receiver needs ideally to be
    tiny (about the size of a keyring fob).

    Help? :)

  5. Rich Grise

    Rich Grise Guest

    Yes, that's exactly what X-10 is.

    Have you done any web searching at all?

    Good Luck!
  6. Russell Fray

    Russell Fray Guest

    - I want wireless, not run off the earth cable in a powercircuit which is
    still a wire! It needs to run off batteries not be plugged in.
    - I don't want to BUY a prebuilt module, I want to build a circuit - hence
    the posting in "" :)
    - X10 isn't anything like what I want to do, so not sure why you keep
    pointing me at them unless you work for them!

    Does anybody else have any ideas how I can build a very simple circuit with
    a transmitter and receiver that works over wireless (using airwaves, no
    physical connection to anything including a shared earth line). I do NOT
    want a commercial solution, I want to build it, as this circuit will be
    combined with other electronic circuitry that I am also incorporating in to
    a larger design. I just need pointing towards an appropriate IC pair that
    will send and receive an RF signal over the airwaves.

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