Hi all,

I'm interested in talking to anyone who has done decoding of data
from an RF 2 button remote control. I'll skip most of the details and
get down to the problem.

The data is sent as a combination of short and long pulses. I receive
the pulses OK, and have developed some code that discriminates
between short and long pulses, (approx 500us & 1500us), and
succesfully recognises each button press. It works well, but not well
enough. There is zero tolerance for pulses that are "broken up"
during less than perfect reception. This results in a relatively poor
range of operation. My assumption is that there is still enough of
the pulse getting through that it should still be possible to
identify short and long data pulses.

I'm using a PIC16F877 with the data from the receiver module coming
into RB0/INT. Presently I interrupt on a rising edge, start a timer,
switch to falling edge and on that interrupt read the timer value
which is the pulse width.

I have been thinking of all kinds of averaging and integrating
schemes but my brain hurts and I haven't found a workable solution
yet. I would appreciate any helpful suggestions, especially from
anyone that has already been there and done that.

Thanks, Brent.

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz

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