BMP280 Device Driver

Overview

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.

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Features

• 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.

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BMP280 to Raspberry Pi 4 Pinout

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)

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Documentation

• Linux Device Driver Tutorial - Embetronicx
• Bosch BMP280 Datasheet

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Installation

# 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

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Demonstration video

https://youtu.be/1EwXVq_9rCo