I want to run a battery powered bread board Arduino on 3xAA batteries (so about 4.5V to 4.0V). I understand the concept of using a voltage divider to do level shifting between the ~4.5V MOSI pin on the Arduino to the radio module. But if your input voltage dips a bit, you won't get a consistent outp…

3.3V modules, battery power, and voltage divider level shifting

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