Software I2C interface library. Does not use any platform-specific code, and has a much simpler API than standard Wire library. - Andy4495/SWI2C ...

An Arduino library for the I2C mode of ultrasonic distance sensors RCWL-1605, RCWL-1005, and probably HC-SR04P, with some extra info - ftjuh/RCWL_1X05 ...

We have covered Machine Learning On Tiny Platforms Like Raspberry Pi And Arduino before, but not with such an easy and thoroughly practical example.