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Adafruit Industries, Unique & fun DIY electronics and kits Adafruit PCA9546 4-Channel I2C Multiplexer [TCA9546A Compatible] : ID 5663 - You just found the perfect I2C sensor, and you want to wire up two or three or more of them to your Arduino when you realize "Uh oh, this chip has a fixed I2C address, and from what I know about I2C, you cannot have two devices with the same