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Adafruit Industries, Unique & fun DIY electronics and kits Adafruit PCA9546 4-Channel STEMMA QT / Qwiic I2C Multiplexer [TCA9546A Compatible] : ID 5664 - You just found the perfect I2C sensor, available in a handy chainable Qwiic, or STEMMA QT package, and you want to wire up two or three or four of them to your microcontroller when you realize "Uh oh, this chip has a fixed I2C address, and from what I know about I2C,