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I wrote some I2C sniffer code for a silabs C8051F340 MCU one time. On that MCU, it has specialized I2C hardware, so you only have to peek/poke certain registers to make the I2C bus do what you want.

[Wayne] wrote in to share an item he just finished working on, an I2C GPS shield for the Arduino. While other GPS solutions have existed for quite some time, his caught our eye due to its feature l… ...

Users can simply connect the modules to the Arduino board through Qwiic cables, neatly attach everything together on the provided base, and follow one of the seven projects complete with step-by-step ...

PYGO boards are also stackable on top of each other on the same Arduino board and have built-in measurement redundancies. The level shifters for voltage are integrated to allow I2C sensors to work ...

Rather than simply re-code data on the six wire SPI bus or four I2C to the 1-wire protocol, the IC provides a 512-byte command sequencer in SRAM that can be loaded with multiple I2C or SPI commands.