On Mon, 23 Jun 2003, Michael Rigby-Jones wrote:
> For video applications, even the inbuilt ADC is probably not going to be
> fast enough.  Typicaly a complete conversion cycle on a PIC will take
> between 30 and 40 us which means you will get one, maybe two samples per
> line.  You generaly need a high speed/flash converter for video work.
>
I thought it would take quite a long time (wrt a video scanline), so I was
planning on taking a sample at the beginning of one line, then taking
the next sample from the end of the next line and doing that three times
for the whole frame, then I can do my comparisions in the next odd/even
frame. I know it's not very precise, but I think it'll be enough to detect
significant movement in the picture.

And if *that* doesn't work then I'll have to reinvent the PIR so it's more
daylight-tolerant :/ ....

Cheers,

tim

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