Water metering
Works in progress! I'm not done with migrating this setup to Homey yet!
This article describes the setup of digitally measuring water usage, using a tessel.io microcontroller.
Choosing the correct water meter
You are not allowed to install a water meter yourself. In dialog with the waterworks, ro replace or install a water meter you need to ask for a water meter that can support digital readings.
In Trondheim, Norway, Øwre-Johnsen as delivers the water meters allowed to be installed.
In dialoge with Øwre-Johnsen as, I ended up installing Elster V200 (KVM-T). In addition I ordered and installed the Falcon PR6 pulse module. This one you can install your self.
Reading the pulse
I chose to use a tessel.io microcontroller, because it has both analog and digital gpio ports that is very easy to interact with using javascript.
The Falcon PR6 contains a battery and gives a digital impulse every liter user detected. Connect the black wire to GND and the yellow to one of the numbered PINs.
And when/if you order a Tessel 2, remember to also order a set of jumper wiresthat fits.
Here is a class to read the pulse indicating one liter used.
It can be used like this:
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