6 parts.

• Fermion: LTC4316 I2C Address Shifter ModuleDFRobot
• Gravity: LTC4316 I2C Address Shifter ModuleDFRobot
• micro:Driver - Driver Expansion Board for micro:bit / UNIHIKER M10 / K10DFRobot
• SparkFun 74HC4051 8 Channel Mux BreakoutSparkFun
• SparkFun GPIO BlockSparkFun
• SparkFun SX1509 BreakoutSparkFun