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Posted by panfilero on October 21, 2008, 9:50 am
ok, basically I want to turn on and off an analog switch wirelessly.
The range I need is very short... maybe around 20ft. And I need a
transmitter as small as possible, and hopefully can run on a small
battery (like a key fob and a watch battery). The transmitter only
needs to be able to send 1 command to the reciever which would in turn
tell my analog switch to open... I don't care how big the reciever
is.... and this setup needs to be very responsive so that if someone
taps the button on the transmitter side 10 times in 1 second, the
reciever can open the switch 10 times in 1 second... very minimum
delay, unpercitable... instant! I only want the switch to open while
the button is pressed at all other times the switch should be
closed....
anyway, that's basically it.... can anyone make any suggestions or
point me in the right direction as far as where I could find a
reciever and a transmitter that would fit my criteria? I imagine...
its a pretty simple/basic application... but I know nothing about
reciever/transmitters....
much thanks!
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Posted by Rich Grise on October 21, 2008, 12:19 pm
On Tue, 21 Oct 2008 06:50:15 -0700, panfilero wrote:
>
> ok, basically I want to turn on and off an analog switch wirelessly.
> The range I need is very short... maybe around 20ft. And I need a
> transmitter as small as possible, and hopefully can run on a small
> battery (like a key fob and a watch battery). The transmitter only
> needs to be able to send 1 command to the reciever which would in turn
> tell my analog switch to open... I don't care how big the reciever
> is.... and this setup needs to be very responsive so that if someone
> taps the button on the transmitter side 10 times in 1 second, the
> reciever can open the switch 10 times in 1 second... very minimum
> delay, unpercitable... instant! I only want the switch to open while
> the button is pressed at all other times the switch should be
> closed....
>
> anyway, that's basically it.... can anyone make any suggestions or
> point me in the right direction as far as where I could find a
> reciever and a transmitter that would fit my criteria? I imagine...
> its a pretty simple/basic application... but I know nothing about
> reciever/transmitters....
>
I once got a little tranmitter/receiver pair at Radio Shlock - the
Xmtr was like a key fob, and the receiver was a plug-in box about
the size of a coffee timer; that could be adapted.
Good Luck!
Rich
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Posted by Robert Monsen on October 21, 2008, 12:55 pm
On Tue, 21 Oct 2008 06:50:15 -0700 (PDT), panfilero
>ok, basically I want to turn on and off an analog switch wirelessly.
>The range I need is very short... maybe around 20ft. And I need a
>transmitter as small as possible, and hopefully can run on a small
>battery (like a key fob and a watch battery). The transmitter only
>needs to be able to send 1 command to the reciever which would in turn
>tell my analog switch to open... I don't care how big the reciever
>is.... and this setup needs to be very responsive so that if someone
>taps the button on the transmitter side 10 times in 1 second, the
>reciever can open the switch 10 times in 1 second... very minimum
>delay, unpercitable... instant! I only want the switch to open while
>the button is pressed at all other times the switch should be
>closed....
>anyway, that's basically it.... can anyone make any suggestions or
>point me in the right direction as far as where I could find a
>reciever and a transmitter that would fit my criteria? I imagine...
>its a pretty simple/basic application... but I know nothing about
>reciever/transmitters....
>much thanks!
http://www.futurlec.com/Radio.shtml
These are very easy to use. Use a 4066, and drive it with the
receiver.
Regards,
Bob Monsen
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Posted by panfilero on October 22, 2008, 4:14 pm
> On Tue, 21 Oct 2008 06:50:15 -0700 (PDT), panfilero
> >ok, basically I want to turn on and off an analog switch wirelessly.
> >The range I need is very short... maybe around 20ft. And I need a
> >transmitter as small as possible, and hopefully can run on a small
> >battery (like a key fob and a watch battery). The transmitter only
> >needs to be able to send 1 command to the reciever which would in turn
> >tell my analog switch to open... I don't care how big the reciever
> >is.... and this setup needs to be very responsive so that if someone
> >taps the button on the transmitter side 10 times in 1 second, the
> >reciever can open the switch 10 times in 1 second... very minimum
> >delay, unpercitable... instant! I only want the switch to open while
> >the button is pressed at all other times the switch should be
> >closed....
> >anyway, that's basically it.... can anyone make any suggestions or
> >point me in the right direction as far as where I could find a
> >reciever and a transmitter that would fit my criteria? I imagine...
> >its a pretty simple/basic application... but I know nothing about
> >reciever/transmitters....
> >much thanks!
> http://www.futurlec.com/Radio.shtml
> These are very easy to use. Use a 4066, and drive it with the
> receiver.
> Regards,
> Bob Monsen
Thanks, do you know if I buy this... do I need to buy something called
a encoder and decoder?
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Posted by Robert Monsen on October 23, 2008, 12:39 am
On Wed, 22 Oct 2008 13:14:18 -0700 (PDT), panfilero
>> On Tue, 21 Oct 2008 06:50:15 -0700 (PDT), panfilero
>> >ok, basically I want to turn on and off an analog switch wirelessly.
>> >The range I need is very short... maybe around 20ft. And I need a
>> >transmitter as small as possible, and hopefully can run on a small
>> >battery (like a key fob and a watch battery). The transmitter only
>> >needs to be able to send 1 command to the reciever which would in turn
>> >tell my analog switch to open... I don't care how big the reciever
>> >is.... and this setup needs to be very responsive so that if someone
>> >taps the button on the transmitter side 10 times in 1 second, the
>> >reciever can open the switch 10 times in 1 second... very minimum
>> >delay, unpercitable... instant! I only want the switch to open while
>> >the button is pressed at all other times the switch should be
>> >closed....
>> >anyway, that's basically it.... can anyone make any suggestions or
>> >point me in the right direction as far as where I could find a
>> >reciever and a transmitter that would fit my criteria? I imagine...
>> >its a pretty simple/basic application... but I know nothing about
>> >reciever/transmitters....
>> >much thanks!
>> http://www.futurlec.com/Radio.shtml
>> These are very easy to use. Use a 4066, and drive it with the
>> receiver.
>> Regards,
>> Bob Monsen
>Thanks, do you know if I buy this... do I need to buy something called
>a encoder and decoder?
The encoder chip will ensure that you are only getting signals from
the sender, and not from some other stray 415MHz signal. If you don't
really care about that, you can just use the output as is. I used one
of these to run a servo once. No encoder, just the tx and rx pair, and
it worked quite well.
Regarding the 4066, you can't use it to switch signals outside the Vcc
to Vss range. So, use a blocking capacitor, and then bias it into the
middle of the range with two 100k resistors, one to Vss, one to Vcc.
Then switch it. After this, use another cap to bring it back down to
earth...
Note that you can only switch signals with this arrangement. If you
are trying to switch a speaker, it won't work well, since the 4066 has
pretty high resistance when it is on. There are newer switches that
have much lower resistance.
Regards,
Bob Monsen
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> ok, basically I want to turn on and off an analog switch wirelessly.
> The range I need is very short... maybe around 20ft. And I need a
> transmitter as small as possible, and hopefully can run on a small
> battery (like a key fob and a watch battery). The transmitter only
> needs to be able to send 1 command to the reciever which would in turn
> tell my analog switch to open... I don't care how big the reciever
> is.... and this setup needs to be very responsive so that if someone
> taps the button on the transmitter side 10 times in 1 second, the
> reciever can open the switch 10 times in 1 second... very minimum
> delay, unpercitable... instant! I only want the switch to open while
> the button is pressed at all other times the switch should be
> closed....
>
> anyway, that's basically it.... can anyone make any suggestions or
> point me in the right direction as far as where I could find a
> reciever and a transmitter that would fit my criteria? I imagine...
> its a pretty simple/basic application... but I know nothing about
> reciever/transmitters....
>