I left the water meter from the water company intact, so i added my own water meter
in series right after that one.
The water meters have a rotating dial with a little magnet on it, that triggers
a reed switch.
Here you see the two water meters installed. The left picture shows my central heating
and the water meter for hot water usage, the right picture shows the meter for total
water usage, installed in the meter cabinet.
Remember, you can click the images to enlarge them.
This is the HA7Net, that's being used for collecting the data for hot water usage.
The reed switch from the water meter is connected to an input from a Dallas 1-Wire
DS2423-based counter from Hobbyboards.This DS2423 takes care of the counting, and
is being polled at regular intervals, either directly by means of 1-Wire or by telling
the HA7Net to do so. Then the data is stored into a SQL Server table.
Water usage is stored on a hourly basis, meaning that for every hour that water
has been used in our house, there is a record (row) in the SQL Server table that
holds the data.With this it is possible to create very detailed charts of our water
More information about the components used:
the company where i bought the water meters
Hobby Boards Dual Counter
Dallas Semiconductor DS2423