In message , Theo
writes
Gas is tricky - it's hard to measure without interposing something in the
flow (or maybe Doppler ultrasound?). That means you're left trying to read
the exist meter optically - does it give a pulse or something a sensor could
be attached to? Apparently it's illegal to strap on sensors, but a
non-contact way to read it might be feasible - worst case a camera pointed
at the digits. It would likely need to be tailored to whatever meter you
have.


The camera approach was the only one I could come up with, but I've no
expertise in that area. Problem is that the gas meter is outside in a
housing, so no power to run a camera from.

They have a module which is battery-powered and does the metering, and
talks by radio (433MHz I think) to a Pi.


I spotted that, providing it works through a breeze block wall, I might
be onto something.

Adrian
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