README.md

BMP280 pressure sensor library for AVR (Arduino) in plain C

This library can be used to add BMP280 pressure and temperature sensor from Bosch Sensortec to your AVR/Arduino projects.

How to use the sample code

• Get an AVR/Arduino-based board with 3.3V power (I used Arduino Nano)
• Get a break-out board with BMP280 (I used GY-BMP280)
• Connect your 3.3V AVR/Arduino board to the BMP280 board using I2C:
  • GND at Arduino to GND at BMP280
  • 3.3V VCC to VCC
  • SDA to SDA
  • SCL to SCL
  • 3.3V VCC to SDO and CSB
• Connect the Arduno to your computer
• Run "make" and "make program_flash"
• Read the Arduino serial port ("cat /dev/ttyUSB0" when using Linux)

How to use the library

• Copy the bmp280/ and i2chw/ subdirectories to your project.
• Adjust bmp280/bmp280.c (see the comments at the beginning)
• Edit your Makefile to compile i2chw/i2cmaster.o and bmp280/bmp280.o, and add these object files to your linker command.
• Profit! :-)

Credits

This library uses the the I2C/TWI master library by Peter Fleury for its I2C configuration.

The example.c file uses the UART library by Peter Fleury for debugging output.

Apart from the above, the BMP280 library itself as well as the example file is written by Jan "Yenya" Kasprzak.