A Free Pascal project (Typhon) for displaying temperatures from multiple DS18B20 sensors on a Raspberry Pi with a graphical user interface (GUI).
- Reads multiple DS18B20 sensors via GPIO (1-Wire)
- Displays temperatures in a GUI (not a console program)
- Automatic update of values every second
- Linearization of sensor readings to reduce typical nonlinearity
- Displays sensor IDs in a grid
- Programmed with Free Pascal using Typhon
- If using Lazarus, some file suffixes may need to be changed
- Developed for Raspberry Pi on Linux (uses
/sys/bus/w1/devices/...) - No additional libraries required (pure FPC project)
- Sensor values are updated approximately every 1 second (12-bit resolution)
- GUI starts automatically
The typical accuracy of the DS18B20 is ±0.5 °C. By applying a polynomial correction formula based on the manufacturer’s data, deviations can be reduced to ±0.03 °C.
Note: A constant offset may still be required externally for individual sensor calibration.
-
Enable 1-Wire in
/boot/config.txt:dtoverlay=w1-gpio -
Reboot the Pi.
-
Compile the project using Typhon or use the binary
-
Run the application (GUI starts automatically).
Alternatively, you can use the graphical interface of raspi-config to enable the 1-Wire bus:
- Go to Advanced Options → Interfacing Options
- Enable 1-Wire and set it to Enabled
- Reboot the Raspberry Pi to apply the changes
Erstellt von RaspberryFpc