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How to wirelessly turn something on?

  • I'm looking to put together a project and ran into a problem. I want it to sit connected to a battery/plugged into a wall and remain off until i push a button somewhere else (Like a remote control) and turn it on. I know this is easily accessed technology as I do it every day with my TV, XBOX, and everything else i use. But now i realized I actually have no idea how this works. I don't want line of sight requirement.. so infrared is out, i'm thinking radio, like blue tooth or something. How do i actually go about building this into the circuitry of a product?? 1. What kind of options do it have? 2. How do i do it?? Feel free to be as specific as possible, im getting my physics degree so i understand science, radio waves, bandwidth, circuitry components (Resistors, capacitors, etc) But i just don't know where to start with this. What do i need to connect to make this work? I dont want it to interfear, and if possible, id love to have more then one device activated by the same switch (or at least the possibility of it) THANKS!

  • Answer:

    There are a couple of ways to do this. One is called "Carrier Current" where a radio signal is carried over the power lines. This requires that both the controller and the controlled item be plugged onto the AC power line. I don't think this is what oyu are after. The other option, (since you don't want it limited by line-of-sight), is the remote has a small radio transmitter which turns on and sends a coded signal to a receiver in the controlled equipment, and a latch/unlatch circuit to control the output. This would only have to transmit a few milliwatts, and could operate on almost any frequency. (The reason you would need a coded signal is to eliminate false triggering by electrical noise/static.) If you want a really small controller, you would need to use a UHF or microwave frequency, like automotive remote lock/unlock remotes do, so you don't have to have an external antenna on the remote. The ISM, (Industrial, Scientific and Medical) band - around 2 GHz - where bluetooth devices and microwave ovens operate would be a good bet. Another band might be around 300 MHz. A third option would be to have Harry Potter as a room-mate! :-} Good luck and God Bless.

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There are a couple of ways to do this. One is called "Carrier Current" where a radio signal is carried over the power lines. This requires that both the controller and the controlled item be plugged onto the AC power line. I don't think this is what oyu are after. The other option, (since you don't want it limited by line-of-sight), is the remote has a small radio transmitter which turns on and sends a coded signal to a receiver in the controlled equipment, and a latch/unlatch circuit to control the output. This would only have to transmit a few milliwatts, and could operate on almost any frequency. (The reason you would need a coded signal is to eliminate false triggering by electrical noise/static.) If you want a really small controller, you would need to use a UHF or microwave frequency, like automotive remote lock/unlock remotes do, so you don't have to have an external antenna on the remote. The ISM, (Industrial, Scientific and Medical) band - around 2 GHz - where bluetooth devices and microwave ovens operate would be a good bet. Another band might be around 300 MHz. A third option would be to have Harry Potter as a room-mate! :-} Good luck and God Bless.

Ivy Vine

As far as I know, TV remotes are infrared and thus line of sight limited. But anyway, back on topic. You'd probably need a radio emitter and a receiver (try and see if you can cannibalise an RC car - quite a few of them use radio waves in the controls). And then you'd need to be able to recode the chips to do what you want, unless you're going to use some form of mechanical actuators to flip the switch.

As far as I know, TV remotes are infrared and thus line of sight limited. But anyway, back on topic. You'd probably need a radio emitter and a receiver (try and see if you can cannibalise an RC car - quite a few of them use radio waves in the controls). And then you'd need to be able to recode the chips to do what you want, unless you're going to use some form of mechanical actuators to flip the switch.

Kyp

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