If you download the ZIP, extract it, and the folder is named Adafruit_BusIO-master , the Arduino IDE will often fail to recognize it. You rename the folder to remove the -master suffix so it matches the internal library structure.
git clone https://github.com/adafruit/Adafruit_BusIO.git zip -r adafruit_i2cdevice.zip Adafruit_BusIO/Adafruit_I2CDevice.h adafruit_i2cdevice.h zip download
Would you like the Python or C++ version? I can provide the complete code content to copy-paste. If you download the ZIP, extract it, and
The official source for the library is the Adafruit BusIO GitHub repository . If you download the ZIP