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
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