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'[EE]: Low current IR decoder? [adr][bayes]'
2003\04\21@211324 by Alex Kilpatrick

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>
> If the detector only has to see an IR pulse which you
> generate, you could ensure that all your transmitted pulses
> are preceded by a 1s burst of modulated IR.  Basically you
> trade off receiver power for transmitter power.  Your
> detector would wake up, see the IR burst, wait for it to end,
> then detect the IR data.
>
> Nigel
> --


Hmm.  So you would control the power to the detector, and have it turn
on for a short time within a one second window.  If it detects a signal,
then it stays on.

Interesting!  
Unfortunately, not feasible for me.  The device is a transceiver.
Sending out a one second pulse of modulated IR would be worse than
leaving the detector on all the time.

Thanks for all the responsed.

Alex

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2003\04\22@043611 by Nigel Orr

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> Unfortunately, not feasible for me.  The device is a transceiver.
> Sending out a one second pulse of modulated IR would be worse than
> leaving the detector on all the time.

The low power device doesn't have to send the 1s burst, or are both parts
of the link low power transceivers?

If so, here's a modification to that idea...

When you want to transmit, for one second, send a burst of 1ms pulses at
38kHz, with one burst every 25ms (40 bursts in total), and when you wake
up, watch for a pulse for 50ms.  That way, the transmit duty cycle is
reduced to 4%, and the receiver power stays the same.  Would that be an
option?

Main problem is that both might transmit at the same time and miss each
other, but that's not insurmountable with a good choice of protocol.

Nigel

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Nigel Orr, Design Engineer                 .....nigelKILLspamspam@spam@axoninstruments.co.uk
Axon Instruments Ltd., Wardes Road,Inverurie,Aberdeenshire,UK,AB51 3TT
              Tel:+44 1467 622332 Fax:+44 1467 625235
                  http://www.axoninstruments.co.uk

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2003\04\22@103819 by Alex Kilpatrick

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>
>
> > Unfortunately, not feasible for me.  The device is a transceiver.
> > Sending out a one second pulse of modulated IR would be worse than
> > leaving the detector on all the time.
>
> The low power device doesn't have to send the 1s burst, or
> are both parts of the link low power transceivers?
>
It is one device that has a transmitter and receiver.  It communicates
with other, identical devices.

> If so, here's a modification to that idea...
>
> When you want to transmit, for one second, send a burst of
> 1ms pulses at 38kHz, with one burst every 25ms (40 bursts in
> total), and when you wake up, watch for a pulse for 50ms.  
> That way, the transmit duty cycle is reduced to 4%, and the
> receiver power stays the same.  Would that be an option?
>
Interesting.  That might work.  I'll give it a try.  Thanks for the
suggestion.

> Main problem is that both might transmit at the same time and
> miss each other, but that's not insurmountable with a good
> choice of protocol.
>
> Nigel
>
I already have that problem now.  Each device transmits at 4 + (random)
seconds to make sure they don't stay in sync too long.  Missing a few
comms is ok.

Alex

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2003\04\22@111301 by Mike Harrison

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On Tue, 22 Apr 2003 09:37:44 -0500, you wrote:

>>
>>
>> > Unfortunately, not feasible for me.  The device is a transceiver.
>> > Sending out a one second pulse of modulated IR would be worse than
>> > leaving the detector on all the time.
>>
>> The low power device doesn't have to send the 1s burst, or
>> are both parts of the link low power transceivers?
>>
>
>It is one device that has a transmitter and receiver.  It communicates
>with other, identical devices.

Have you looked at IrDA transceiver modules ?

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