This is a Linux kernel module for the BMP280 digital pressure and temperature sensor.
It exposes real-time temperature and pressure readings to userspace via the sysfs filesystem.
- Reads temperature and pressure from the BMP280 sensor using the I2C interface.
- Exposes readings through a sysfs attribute for easy access from userspace.
- Includes integer compensation (no floating-point math) as per the official Bosch datasheet.
| BMP280 Pin | Raspberry Pi 4 Connection |
|---|---|
| VCC | 3.3V (pin 1) |
| GND | Ground (pin 6) |
| SCL | GPIO 3 (pin 5) |
| SDA | GPIO 2 (pin 3) |
# 1. Build the kernel module
make
# 2. Insert the module
sudo insmod bmp280.ko
# 3. Instantiate the device
echo bmp280 0x76 | sudo tee /sys/bus/i2c/devices/i2c-1/new_device
# 4. Read temperature and pressure
cat /sys/bus/i2c/devices/1-0076/Bmp280-Calculations