Messages in this thread | | | Subject | Re: Toggling GPIO at 38Khz | From | Krzysztof Halasa <> | Date | Wed, 08 Oct 2008 23:58:34 +0200 |
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"Jon Smirl" <jonsmirl@gmail.com> writes:
> These are external boards people buy to use with MythTV. They are most > commonly used on the x86, but the NSLU2 has been modified to use them > too. > > The hardware can't be changed, people have bought thousands of these devices. > > Many people cut up a serial cable and solder it themselves...
Sure but you only need to bit-bang at 36 or so kHz while transmitting, right? The receive side is a slow one as the receiver chip has an integrated "demodulator".
If so then personally... I'd abandon the simple TX circuit, and use a hardware ~36 kHz oscillator, gated by the serial output signal. I don't think such transmitters are in thousands. Tens, maybe - the cost of replacing/modifying them all should be insignificant. I guess one could design and produce such a TXer in less than 20 minutes. -- Krzysztof Halasa
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