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According to the Wire library documentation https://forum.arduino.cc/index.php?topic=132130.0: The Arduino Due has two I2C / TWI interfaces SDA1 and SCL1 are near to the AREF pin and the additional one is on pins 20 and 21. And the table: Arduino Due: 20 (SDA), 21 (SCL), SDA1, SCL1 So it seems in your table SCL2 should be SCL1.


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