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CJMCU- 9548 TCA9548A 8CH I2C Multi-channel Extension Board Module
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 address on the same SDA/SCL pins!" Are you out of luck? You would be£¬ if you didn't have this ultra-cool CJMCU-9548 1-to-8 I2C multiplexer! Finally£¬ a way to get up to 8 same-address I2C devices hooked up to one microcontroller - this multiplexer acts as a gatekeeper£¬ shuttling the commands to the selected set of I2C pins with your command. Using it is fairly straight-forward: the multiplexer itself is on I2C address 0x70 (but can be adjusted from 0x70 to 0x77) and you simply write a single byte with the desired multiplexed output number to that port£¬ and bam - any future I2C packets will get sent to that port. In theory£¬ you could have 8 of these multiplexers on each of 0x70-0x77 addresses in order to control 64 of the same-I2C-addressed-part. Like all Adafruit breakouts£¬ we put this nice chip on a breakout for you so you can use it on a breadboard with capacitors£¬ and pullups and pulldowns to make usage a snap. Some header is required and once soldered in you can plug it into a solderless-breadboard. The chip itself is 3V and 5V compliant so you can use it with any logic level.