On Tue, 11 Sep 2007 19:03:45 +1000, j.chitte <> wrote:
> Hi,
>
> I have a std household water meter (water is metered like
> electricity
> here). I want to use this as digital flow meter connected to a 7250.
>
> My initial idea was to take the opto couple out of an old serial
> mouse
> and set it to monitor the teeth on one of the gear wheels of the
> meter. They are quite similar in form to the chopper wheel in the
> mouse.
>
> Then I realised that the small PCB in the mouse had all biasing ,
> debounce and an RS232 interface ready and waiting and that I could
> free up COM1 on the 7250. I already have all I need to monitor a
> small toothed wheel rotating. I just need to count the blips.
>
> The meter will be moving relatively slowly so the low baud rate of a
> mouse is not a problem. Better still it will give me two channels, x
> and y, and I need two flow meters.
>
> Any thoughts on whether it would be best follow this with the kernel
> mouse driver or by directly reading the serial port. Or is this just
> a daft idea anyway and I should interface the opto directly to a DIO
> line?
>
> Thanks for any wise comments.
>
> /jacques
mouse method should work fine. see www.softnco.demon.co.uk/SerialMouse.txt
for interpreting the protocol yourself
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