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 :)