To maintain a healthy work environment in the home office, different parameters are scanned and airing suggestions are sent via push notifications. The project is based on a raspberry pi and sensation SCD30 CO2 sensor.
- Raspberry pi (tested on model 3, but any other may work as well)
- Sensirion SCD30 CO2 sensor
- 4 wires
This scheme presents how you hook up the sensor to the pi so they can communicate via the I2C protocol:
- Set up your pi with a fresh pi OS
- Wire up the sensor according to the scheme
- Turn on the raspberry pi and run
pip install scd30_i2cin the terminal to install the python package for the sensor andpip3 install apprisefor the push notification - Next, we need to get the push notification running. To send notifications I use the pushover app. Create an account at pushover.net and create an application/API token. Give the application a nice name and make sure to save your API token/key, but do not share it with anyone. Also, make sure you have your user key, you find it on the main page in the upper right corner.
- Now you create an
auth.jsonfile and fill it with the following code, inserting your authentification credentials:
{
"key": "YOUR-KEY-HERE",
"token": "YOUR-API-TOKEN-HERE"
}- Start the app by navigating with the terminal into the repository and using
python3 ./app.py. You should see that the app automatically creates a database to store the data and populate it. - Congratulations you are done! You should see a yellow LED blinking at the sensor. This indicates that the sensor started the measurement mode.
- Bonus: Use Linux crontab to start the air monitor automatically on reboot. Open the terminal again, type
crontab -e, and choose your editor of preference (e.g. nano). You should be presented with a file that includes the crontab information. Add the following line to the bottom of the file and adjust the dependency path if necessary
@reboot python3 PATH-TO-REPOSITORY-HERE/Air-Monitor/app.py > PATH-TO-REPOSITORY-HERE/Air-Monitor/out_log.txt