indoor-seedomation

python-based indoor seedling starter monitor and control. Put into use on my home network using a Raspberry Pi.

main script

• It monitors an MQTT topic that contains temperature read from a sensor placed in soil.
• Based on temperature it turns a heater on or off to keep temperature in a range.

# Install a python3 dev setup and other libraries
sudo apt install -y python3-pip python3-venv build-essential \
    python3-setuptools python3-wheel git

# need this one too (required by ssdp # from lxml import etree as et)
sudo apt install libxslt-dev

# place a clone of this repo in ~/projects/
mkdir -p ~/projects
cd ~/projects

git clone https://github.com/idcrook/indoor-seedomation.git
cd indoor-seedomation

Install

$ cd ~/projects/indoor-seedomation
$ python3 -m venv .venv
$ source .venv/bin/activate
(.venv) $ pip install --no-cache-dir -r requirements.txt

Friendly names of the wemo devices are hard-coded in scripts below.

They also assume they are being run in the virtualenv that has been created:

$ cd ~/projects/indoor-seedomation
$ source  .venv/bin/activate
(.venv) $ python ...

Simple pywemo library test (wemo device discovery)

Taken from the pywemo docs

>>> import pywemo
>>> devices = pywemo.discover_devices()
>>> print(devices)
[<WeMo Insight "AC Insight">]

>>> devices[0].toggle()

For advanced usage, the device.explain() method will print all known actions that the device reports to PyWeMo.

Discovery script

Uses same library function as above but looks for device names and queries device info.

$ source  .venv/bin/activate
(.venv) $ python discovery.py
  Bedroom 2 Plant Heater
  Bedroom 2 Plant Light 2
  <<...>>

Other examples

See control.py and mqtt.py

Install loop.py as systemd service

Refer to instructions in comments at the top of example service file

Example loop.py output

('Bedroom 2 Plant Heater',)
 setting device Bedroom 2 Plant Heater state to 0
Turning OFF device Bedroom 2 Plant Heater
Starting Control LOOP
Using temperature range of 68.0F to 74.0F
Main thread: D0 SM0
Wemo Insight: Bedroom 2 Plant Heater
current state: 0, temperature 67.2
 setting device Bedroom 2 Plant Heater state to 1
Turning ON  device Bedroom 2 Plant Heater
current state: 1, temperature 67.2
current state: 1, temperature 67.3
current state: 1, temperature 67.4
current state: 1, temperature 67.4

Configuration

# create config file (edit script or output)
python3 create_cfg.py
cp config.example.json config.secrets.json
# !! EDIT FILE config.secrets.json for your environment

Troublshooting

Missing libxslt XML library

Encountered on armv7 Raspbian bookworm, from the pywemo / .ouimeaux module

$ python discovery.py
[STACKTRACE]
   ...
 from lxml import etree as et
ImportError: libxslt.so.1: cannot open shared object file: No such file or directory
$ sudo apt install libxslt1.1
# should now work
$ python discovery.py