Don't use SCL and SDA in your code, on the Uno use A4 and A5 instead. These pins can be used as anlog or digital pins. For digital I/O use pinMode() to configure the pins as for any other I/O pins.
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Don't use SCL and SDA in your code, on the Uno use A4 and A5 instead. These pins can be used as anlog or digital pins. For digital I/O use pinMode() to configure the pins as for any other I/O pins.