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Home > Archive > Electrical Engineering > July 2006 > newbie question
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| voodoochile 2006-07-21, 3:25 am |
| Hi guys,
I wonder if anyone can help me with this simple problem I have as art of my
school project..
I am trying to turn an electrical current on and off down a wire via a
wireless signal on a key fob.
The cable is connected to a light. All I need to do is switch it on and
off -remotely.
Yes, I have seen remote light dimmers, but all I need to do is switch the
light on and off (not dim) and make the circuit as cheap and easy as
possible.
Can anyone tell me what the simple circuit diagram should look like, and
what components need to be on the pcb etc?
Plus if anyone can - what the circuit in the key fob should look like.
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| Salmon Egg 2006-07-21, 1:25 pm |
| On 7/20/06 9:59 PM, in article qaZvg.2075$I9.285@fe2.news.blueyonder.co.uk,
"voodoochile" <voodoochile3@blueyonder.co.uk> wrote:
> Hi guys,
>
> I wonder if anyone can help me with this simple problem I have as art of my
> school project..
>
> I am trying to turn an electrical current on and off down a wire via a
> wireless signal on a key fob.
>
> The cable is connected to a light. All I need to do is switch it on and
> off -remotely.
> Yes, I have seen remote light dimmers, but all I need to do is switch the
> light on and off (not dim) and make the circuit as cheap and easy as
> possible.
>
> Can anyone tell me what the simple circuit diagram should look like, and
> what components need to be on the pcb etc?
>
> Plus if anyone can - what the circuit in the key fob should look like.
>
>
>
Outfits like Radio Shack probably have kits just for that.
Bill
-- Ferme le Bush
| |
| Palindr☻me 2006-07-21, 1:25 pm |
| voodoochile wrote:
> Hi guys,
>
> I wonder if anyone can help me with this simple problem I have as art of my
> school project..
>
> I am trying to turn an electrical current on and off down a wire via a
> wireless signal on a key fob.
>
> The cable is connected to a light. All I need to do is switch it on and
> off -remotely.
> Yes, I have seen remote light dimmers, but all I need to do is switch the
> light on and off (not dim) and make the circuit as cheap and easy as
> possible.
>
> Can anyone tell me what the simple circuit diagram should look like, and
> what components need to be on the pcb etc?
>
> Plus if anyone can - what the circuit in the key fob should look like.
>
>
>
OK. Wireless basically means radio, optical or acoustic.
Acoustic is pretty easy. Your fob would have an oscillator circuit
connected to an ultrasonic transducer. The receiver is another
ultrasonic transducer with amplifier, followed by a divide by two
counter with one output driving a relay.
Optical is much the same, except you would use LEDs and optical sensors
instead. You can get optical sensors with amplifiers built-in - with
outputs almost ready to be used to clock the divide by two circuit.
Wireless is a bit trickier as licencing may be involved and aerial
design can be problematic. Best avoided unless you are allowed to use
pre-built transmitters and receivers. eg, taken from a toy rc car, perhaps?
Cheapest probably means optical.
--
Sue
| |
| Bob Ferapples 2006-07-22, 3:25 am |
| On Fri, 21 Jul 2006 17:56:48 +0100, Palindr?me <me9@privacy.net>
wrote:
>voodoochile wrote:
>OK. Wireless basically means radio, optical or acoustic.
>
>Acoustic is pretty easy. Your fob would have an oscillator circuit
>connected to an ultrasonic transducer. The receiver is another
>ultrasonic transducer with amplifier, followed by a divide by two
>counter with one output driving a relay.
>
>Optical is much the same, except you would use LEDs and optical sensors
>instead. You can get optical sensors with amplifiers built-in - with
>outputs almost ready to be used to clock the divide by two circuit.
>
>Wireless is a bit trickier as licencing may be involved and aerial
>design can be problematic. Best avoided unless you are allowed to use
>pre-built transmitters and receivers. eg, taken from a toy rc car, perhaps?
>
>Cheapest probably means optical.
I got one of these down at Home Depot. Works great.
http://dogbytecomputer.com/xcart/ca...ychain_Kit.html
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