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I2C 7-bit addressing reminder Since I keep re-remembering: i2c_msg.write(0x37, [0x50, 0x80]) turns into: 0x6E, 0x50, 0x80 because I2C uses 7-bit addressing. 0x37 = 00110111 0x6E = 01101110 0x50 = 01010000 0xA0 = 10100000...