This simple PCB is used to distribute i2c bus signals from the CPU to various sensors (encoders, or addons).
It’s compatible with any dupont style cables found in Pi or Arduino kits. In this design, we only need four signals (ground, 3.3v, data, and clock) but we have added two rows to duplicate ground and 3.3v. This way, the power and ground is symmetric and it’s easier to hookup without risk of damage to your components.
Safety Feature! If you connect to the wrong ground, nothing will fry: you’ll just have the data wires crossed.