Temperature monitoring device for a ground source heat pump. Uses four ds18b20 temperature sensors and a Raspberry Pi Zero with wifi.
See details in the blog post: https://blog.ampli.fi/temperature-monitoring-solution-based-on-raspberry-pi/
- Connect the sensors to the Raspberry Pi Zero according to https://www.circuitbasics.com/raspberry-pi-ds18b20-temperature-sensor-tutorial/
- Except use a 10kohm resistor instead of a 4.7kohm one.
- Write the basic Raspberry Pi OS image on an SD card.
- Connect power, display, mouse and a keyboard to the Raspi and start it up.
- Go through the initial setup:
- Set region/language
- Create a user account called “monitor”
- Set up wifi network
- Reboot
- Start a terminal and run raspi-config
- System options -> Boot / auto login -> Select non-auto-login CLI
- Interface options: Enable SSH
- Reboot again
Instructions from https://pimylifeup.com/raspberry-pi-nodejs/
sudo apt install -y ca-certificates curl gnupg
curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /usr/share/keyrings/nodesource.gpg
NODE_MAJOR=20
echo "deb [signed-by=/usr/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
sudo apt update
sudo apt install nodejs
Copy the following files from the repository root to:
/home/monitor/monitor/server.js
/home/monitor/monitor/reader.js
/home/monitor/monitor/enable.sh
And then:
chmod +x /home/monitor/monitor/enable.sh
Go to /sys/bus/w1/devices/ and run ls. You should see your temperature sensors as directories named 28-xxxxxxxxxxxx. Edit reader.js, and replace the “files” array values with the ids of your sensors.
Add cronjobs in /etc/cron.d/monitor:
@reboot /home/monitor/monitor/enable.sh # runs required setup commands on boot
0 5 * * * monitor find /home/monitor/monitor/logs/ -type f -mtime +90 -delete # Cleans up old log files, change the number of days "90" to what you want
* * * * * monitor /usr/bin/node /home/monitor/monitor/reader.js # Reads the sensors once a minute and saves data to log file
@reboot /usr/bin/node /home/monitor/monitor/server.js & # Runs the server on startup
Reboot the Raspberry Pi. Check its IP address, and try to access the monitor at for example http://192.168.0.10:8080