• Yay, it works with I2C3.setup( { scl: A8, sda: B4 } ); on the pico. Thank you!!

    I've checked the other I2C-pins too:

    1. I2C1.setup( { scl: B6, sda: B7 } ); // not working
      2. I2C1.setup( { scl: B8, sda: B9 } ); // not working
      3. I2C2.setup( { scl: B10, sda: B3 } ); // working
      4. I2C3.setup( { scl: A8, sda: B4 } ); // working

      But USB is always connected. Is there really no difference between I2C1 and the I2C2 or I2C3?
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