This board runs at 3.3V, so if you are connecting it to a 5V device you will want a logic level converter. The Arduino Uno runs at 5V, not 3.3V so you will want a logic level converter to connect this board to the Uno
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This board runs at 3.3V, so if you are connecting it to a 5V device you will want a logic level converter. The Arduino Uno runs at 5V, not 3.3V so you will want a logic level converter to connect this board to the Uno