CJMCU-9548 TCA9548A 1-to-8 I2C 8-Channel IIC Multiplexer Multi-channel Expansion Development Board For Arduino

What is this?

You just found the perfect I2C sensor, and you want to wire up two, three, or more of them to your Arduino. When you realize “Oh no, 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 don’t have this cool CJMCU TCA9548A I2C 8 Channel Multiple extensions development board.

What can I build with it?

• Beginner robots, line followers, and classroom kits
• Sensor experiments with clear pin headers

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Compatibility notes

No verified pin/voltage metadata in our engineering catalog for this title. Treat electrical details as unverified until you check the datasheet.

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Specifications

• Cjmcu-9548 TCA9548A 1-to-8 I2c 8-channel Iic Multiplexer Multi-channel Expansion Development Board For Arduino
• The CJMCU TCA9548A I2C 8 Channel Multiple extensions development board is interesting in that it has an I2C address (0x70 by default) – and you basically send it a command to tell it which I2C multiplexed output you want to talk to, then you can address the board you want to address.
• Robu.in have a different kind of breakout boards; for more boards Click here .
• We suggest using this little helper to help you select the port
• #define TCAADDR 0x70
• void tcaselect(uint8_t i) { if (i > 7) return;
• Wire.beginTransmission(TCAADDR); Wire.write(1 << i); Wire.endTransmission(); }
• You can then call tcaselect(0) thru tcaselect(7) to set up the multiplexer.

Listed from catalog data. Treat as merchant-provided, not independently lab-verified, unless noted above.

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