Adafruit has hundreds of designs that use I2C - a two-wire protocol that can let you quickly connect sensors, OLEDs, GPIO expanders, and more. Folks love I2C because you can simply connect 4 wires for power and data, and even better, share those wires with multiple devices!One things folks don't like about I2C is that each device requires it's own unique 'address'. You can only have one device with a 0x20 address, for example, so while in theory you could have up to 127 device, each for...