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    Additional I2C devices - which addresses are free?

    UniPi 1 - HW Q&A
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    • S
      sjp770 last edited by

      I'm new to I2C but im looking to plug in a 4 channel dimmer board based on the PCF8574 chip. The addresses it can be set to are:
      // Device address -> 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x20
      // Device address -> 0x3F, 0x3E, 0x3D, 0x3C, 0x3B, 0x3A, 0x39, 0x38

      Which would work best with the UniPi?

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        tomas_hora administrators @sjp770 last edited by

        @sjp770 I would avoid 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21, 0x20 because they can be taken by EMO-R8 (0x20 is already taken by the onboard MCP23008). Overview from the documentation: 0_1500358292900_doc_unipi1.png

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        • S
          sjp770 last edited by

          Thanks for that, but seeming I wont be using a EMO-R8 anything besides 0x20 in that list is ok?

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            tomas_hora administrators @sjp770 last edited by

            @sjp770 Correct :)

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