This work is based on the awesome scripts provided by randomnerdtutorials.com
https://RandomNerdTutorials.com/raspberry-pi-motion-email-python/
https://RandomNerdTutorials.com/raspberry-pi-ds18b20-python/
- Raspberry Pi 4
- Ds18b20 temperature sensor
This assumes you already have access to your pi in headless mode.
Use the following where <connection_name> is just a name you give this connection (example: "SchoolWifi") and < ssid > is, you guessed it, the SSID (so "eduroam")
sudo nmcli connection add type wifi con-name "<connection_name>" ifname wlan0 ssid "<ssid>"
Here you set up authentication (put in your username and password). <connection_name> is the name you gave it earlier (in my example this would be "SchoolWifi"). <your_username> is the username you use to log into the eduroam network on your phone, for example. Usually it's the email given to you by the school (example: [email protected]). <your_password> is the password you use, along with the username, when logging into the wifi (example: badpassword123)
sudo nmcli connection modify "<connection_name>" wifi-sec.key-mgmt wpa-eap 802-1x.eap peap 802-1x.phase2-auth mschapv2 802-1x.identity "<your_username>" 802-1x.password "<your_password>"
(Only if necessary) Add a CA certificate:
sudo nmcli connection modify "<connection_name>" 802-1x.ca-cert "/path/to/ca_cert.pem"
(optional) Adding priorities to the networks on your device. For me, after completing steps 1 and 2 I then had 2 networks saved; "eduroam" and "preconfigured"; if you don't have a keyboard and monitor for the raspberry pi and ssh is your only way of communicating with the device you should put a priority on the 2 networks so that if anything goes wrong it will connect to the original network on reboot. I say this because I was unable to ssh to my raspberry pi through the eduroam network. You add priorities with the following:
sudo nmcli connection modify "<connection_name>" connection.autoconnect-priority <number>
You can see the saved networks
nmcli connection show
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Place the temp_alarm.py script under the path
/home/pi/(assumming your username is "pi") -
Create a new file in /etc/systemd/system/. We will call it temp_alarm.service (see temp_alarm.service in the repo).
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Enable and Start the Service
Reload systemd to read your new service file:
sudo systemctl daemon-reload
Enable the service at boot:
sudo systemctl enable temp_alarm.service
Start the service right now (for testing):
sudo systemctl start temp_alarm.service
Check the status to see if it’s running:
systemctl status temp_alarm.service
You should see output indicating the service is active (running), along with any logs printed by your Python script.
- Verify at Reboot
Reboot your Pi:
sudo reboot
After the Pi boots:
systemctl status temp_alarm.service
If everything is correct, the service should show as active (running) and your script will autostart each time the Pi boots.