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Home Automation

This is a home automation system for sprinklers and environment sensors. The system is built up using django on top of 1-wire based sensors (running on Raspberry PI's, but any linux box should do.)

The watering cycles are designed to be "smart." For each circuit we establish the amount of water delivered per hour (typically inches/hour but units are configurable.) For typical lawn sprinklers, this can be easily determined by placing a plastic cup on the lawn, and running the circuit for 10 or 15 minutes, then measuing the amount of water in the cup, and extrapolating the amount delivered in an hour. Then look up the recommended amount of water per week for your type of grass (or plants) for you general climate. Then pick how many days/hours to wait between cycles. For example, with lawns, deeper watering less frequently will result in deeper root systems and more hearty lawns. For vegitable gardens, young plants wont have deep root systems so you'll need to water more frequenty.

Once watering rate, target amount per week, and time between cycles is known, then the system can deliver the optimal amount of water for the circuit. Over time, you can tweak the goal based on how the plants look (e.g., increase if they're getting brown, decrease if they're growing too quickly.)

In addition, if a rain guage is wired up, the system will record rain volume against each circuit so watering can be avoided when mother nature takes care of it for us.


  • Add temperature/humidity modifier for circuits - if temps are low, water less, if temps are high, water a bit more.
  • Consolidate old historical temp/humidity sensor readings to just daily high/low to improve performance on low-power systems like RasberryPIs
  • Convert initial bootstrap logic from hard-coded scripts to configuration driven
  • Further decoupling of the 1-wire logic for sprinkler circuits so they can be driven by a remote instance of the app


docker-compose build
docker-compose up

DB init

echo "create database home_automation;" | docker exec -i homeautomation_db_1 psql -U postgres
cat dump.sql | docker exec -i homeautomation_db_1 psql -U postgres home_automation

Plausible crontab entries:

*/1 * * * * /usr/bin/docker exec homeautomation_app_1 python ./ --queue ./queue
0 4 * * * /usr/bin/docker exec homeautomation_app_1 python ./

Wipe old data

python ./ flush

sync up the DB schema

python ./ syncdb

Load the known sprinkler circuits

python ./

Migrate data from the old DB

python ./

Run the server and see what happens...

python ./ runserver

Dump historical data out to migrate between systems

python ./ dumpdata --indent 4 > dump.json
python ./ loaddata dump.json
pg_dump -h localhost -U automation -W home_automation > dump.sql

Create the user

sudo -u postgres createuser -D -A -P automation
sudo -u postgres  psql -c "ALTER USER automation CREATEDB;"
sudo -u postgres createdb -O automation home_automation

Poke around in the raw DB:

psql -h localhost -W home_automation automation

Run Tests

python-coverage run --source='.' test
python-coverage report -m