Mastering I2C on Arduino: How to Download and Use the Adafruit_I2CDevice Library Date: April 13, 2026 Author: The Embedded Circuit Team

You don't download Adafruit_I2CDevice.h alone. You install Adafruit BusIO via the Library Manager.

Adafruit_I2CDevice.h <-- This is the file you wanted! Adafruit_SPIDevice.h Adafruit_BusIO_Register.h Once installed, using the library makes your code incredibly elegant. Here is how you would talk to a BMP280 sensor (address 0x77 ):