Note: This is a patched version supporting the qmc5883 instead of the hmc5883 model. Byte registers are changed based von the Datasheet found 
.
Program to monitor the consumption of gas used for heating in a household .
- Gas counter with a rotating magnet
- Digital 3 axis magnetometer qmc5883L
- Raspberry Pi Model A or B
- Python 2.7
This program uses the 3 axis magnetometer qmc5883 to read the magnetic induction which is produced by a gas counter. The gas counter contains a small magnet that is attached to a rotating counter ring. Each rotation of the counter ring means a consumption of 0.01 m³ gas. The magnetic induction produced by the rotating magnet is read with the magnetometer that is connected to the I²C bus of a Raspberry Pi.
The program monitors that magnetic induction and every time it detects a rotation of the magnet it writes the actual counter and consumption values into a round robin database.
Help:
./qmc5883_gas_counter.py -h
Create rrd databases:
./qmc5883_gas_counter.py -c
Store values of magnetic induction into mag.rrd:
./qmc5883_gas_counter.py -m
Normal operation:
./qmc5883_gas_counter.py
The sub-directory www contains an example to produce a single web page to visualize daily, weekly, monthly, and yearly charts of consumption.
Copyright 2014 Martin Kompf
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.