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Atmega pins can source (provide positive current) or sink (provide negative current) up to 40 mA (milliamps) of current to other devices/circuits.
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Not so puzzling.
You are trying to use an electrical signal in place of a bare switch contact closure.
You should be able to find what the difference described above means in any basic digital electronics textbook.
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Even if you could arrange for the Kindle interface to accept signal inputs rather than switch closures, you are using the wrong interface level. Kindles are not 5v devices, not even back in the K3 days.