DHT22 temperature/humidity sensor logger and browser dashboard for the Raspberry Pi. Based on Adafruit's DHT22 Python library.
- Measure and store temperature and humidity periodically (via cron and sqlite)
- Responsive web dashboard
- Display current temperature and humidity
- Display logged temperature and humidity graphs
- Current outside weather via Forecast.io
sudo apt-get install sqlite3
wget http://node-arm.herokuapp.com/node_latest_armhf.deb
sudo dpkg -i node_latest_armhf.deb
git clone [email protected]:ofalvai/raspi-weather.git
cd raspi-weather
npm install
Install Adafruit's DHT22 Python library according to their instructions.
Edit your sudo crontab with sudo crontab -e (yes, it needs to run as root to access GPIO, use at your own risk), and add this line:
*/30 * * * * /usr/bin/python /home/pi/raspi-weather/sensor_scripts/logger.py
...assuming you want to take measurements every 30 minutes, and cloned into /home/pi.
Connect your DHT22 sensor to the Pi and set the pin variable in sensor_scripts/current.py and sensor_scripts/logger.py to the pin number you use.
You can test both scripts by running sudo sensor_scripts/current.py and sudo sensor_scripts/logger.py. The latter will create the sqlite database file in the project root and log the first measurement.
You can further tweak the frontend settings in public/javascripts/app.js, like:
- temperature unit
- Forecast.io API key and location for outside weather info
- chart options
Start the server (it needs to run as root for the same reason as the cronjob: to aceess GPIO):
sudo nohup node app.js &
...or you can install forever to keep it always running and then sudo forever start app.js
The server runs on port 3000, so visit for example http://192.168.0.100:3000
- Select custom date ranges to display on the graphs
- Average graphs
- Dynamic favicon (like Google Calendar)
Feel free to fork and send me pull requests :)