It can work in production – here’s Adafruit taking the 3.3 V-pulled-up Raspberry Pi I2C bus, and connecting it to a 5 V-powered MCP23017 chip that drives a 5 V-connected HD44780 display.

With vendors like Sparkfun and Adafruit popping I²C devices onto cute breakout boards, it’s tempting to finish off a project with the same hookup wires we started it with. prototyping starts ...

The Adafruit Metro Mini is an Arduino compatible ... The accelerometer is an MPU6050 which uses I2C for communication. It only controls Remy's right arm, but an additional sensor, or some clever ...