pommi/python-itho-wpu
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Pim van den Berg 60c4a794a8 feat(itho-wpu): getdatalog: show name identifier in output 
This shows the name identifier for each measurement. This identifier is
for example used to store measurements in InfluxDB.
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.gitignore feat(gitignore): ignore .envrc, pycache, heatpump.sqlite 2021-03-14 13:43:23 +01:00
convert-itho-db.py feat(convert-itho-db): convert an itho servicetool database to sqlite 2021-01-02 15:53:47 +01:00
db.py feat(convert-itho-db): convert an itho servicetool database to sqlite 2021-01-02 15:53:47 +01:00
i2c_raw.py feat(itho-wpu): initial i2c master functionality 2020-10-17 18:05:56 +02:00
itho-wpu.py feat(itho-wpu): getdatalog: show name identifier in output 2021-03-25 14:14:27 +01:00
README.md docs(readme): installation and execution instructions 2021-03-17 21:19:14 +01:00
requirements.txt feat(convert-itho-db): convert an itho servicetool database to sqlite 2021-01-02 15:53:47 +01:00

README.md

python-itho-wpu

A python library and a set of command line tools to communicate with an Itho WPU.

Hardware installation

See the pislave project

Software installation

  1. Install Raspberry Pi OS Lite

  2. Enable SSH and I2C using raspi-config

  3. Install and configure the required software

    apt-get install \
    git \              # To clone this repository
    pigpiod \          # Pigpio daemon to communicate over the I2C bus
    python3-pigpio \   # Python module to talk to the pigpio daemon
    python3-pyodbc \   # Python module to access an ODBC database
    sqlite3 \          # To store a subset of the Itho database in SQLite
    direnv \           # Environment variable manager to store credentials for InfluxDB
    python3-influxdb   # To export measurements to InfluxDB

# Set the sample rate value of pigpiod to 10 microseconds to decrease CPU usage
sed -i -e 's/ExecStart=.*/ExecStart=\/usr\/bin\/pigpiod -l -s 10/' /lib/systemd/system/pigpiod.service

# Enable pigpiod service
systemctl enable pigpiod

    Install version 0.9.0-1 of odbc-mdbtools

    ARCH=$(dpkg --print-architecture)
curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/odbc-mdbtools_0.9.0-1_${ARCH}.deb
curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/libmdb3_0.9.0-1_${ARCH}.deb
curl -OL http://snapshot.debian.org/archive/debian/20201218T033640Z/pool/main/m/mdbtools/libmdbsql3_0.9.0-1_${ARCH}.deb
dpkg -i libmdb3_0.9.0-1_${ARCH}.deb libmdbsql3_0.9.0-1_${ARCH}.deb odbc-mdbtools_0.9.0-1_${ARCH}.deb

    When executing convert-itho-db.py with mdbtools version ...

    • 0.7.1-6 (Debian Buster) it fails with: ValueError: the query contains a null character
    • 0.9.1-1 (Debian Bullseye) it fails with: Segmentation fault

  4. Reboot the Raspberry Pi

    reboot

  5. Install python-itho-wpu

    git clone https://github.com/pommi/python-itho-wpu.git
cd python-itho-wpu

  6. Extract $_parameters_HeatPump.par from the Itho Service Tool. This is a Microsoft Access database containing details about all WPU versions.

    • Download it directly: 
      curl -OL "https://servicetool.blob.core.windows.net/release/Parameters/\$_parameters_HeatPump.par"
    • Or download the Itho Service Tool and execute AzureBootloader.exe to retrieve the full Itho Service Tool application. $_parameters_HeatPump.par is located in the Parameters directory.

  7. Convert the Microsoft Access database to an SQLite datbase. The SQLite database is used by python-itho-wpu.

    ./convert-itho-db.py --itho-db \$_parameters_HeatPump.par

Example usage of python-itho-wpu

  • Get the NodeID of the WPU

    # ./itho-wpu.py --action getnodeid
ManufacturerGroup: 1, Manufacturer: HCCP, HardwareType: WPU, ProductVersion: 25, ListVersion: 11

  • Get the Serial number of the WPU

    # ./itho-wpu.py --action getserial
Serial: 408

  • Get the Datalog of the WPU

    # ./itho-wpu.py --action getdatalog
Buitentemp (°C): 8.0
Boilertemp Onder (°C): 24.23
Boilertemp Boven (°C): 51.68
Verdamper Temp (°C): 19.84
Zuiggas Temp (°C): 21.7
Persgas Temp (°C): 30.22
Vloeistof Temp (°C): 18.67
Temp Naar Bron (°C): 21.09
Temp Uit Bron (°C): 19.75
...

Exporting measurements

InfluxDB

Assuming InfluxDB is running on the Raspberry Pi as well.

  1. Configure a .envrc file

    cat > .envrc <<EOT
export INFLUXDB_HOST=127.0.0.1
export INFLUXDB_USERNAME=user
export INFLUXDB_PASSWORD=password
export INFLUXDB_DATABASE=itho
EOT

  2. Allow direnv to load environment variables from the .envrc file

    direnv allow

  3. Execute itho-wpu.pu and export to InfluxDB

    ./itho-wpu.py --action getdatalog --export-to-influxdb

  4. Alternatively run this in a 5 minute cronjob (the console output is written to /var/log/itho.log)

    cat > /etc/cron.d/itho <<EOT
PATH=/usr/bin:/bin:/usr/sbin:/sbin

*/5 * * * * root cd /root/python-itho-wpu && direnv exec . ./itho-wpu.py --action getdatalog --export-to-influxdb >> /var/log/itho.log
EOT