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uxcell Photosensitive Sensor Module Digital Light Intensity Detection 4pins DC 3.3-5V for Arduino UNO 5pcs: Amazon.com: Industrial & Scientific
Is there any way to have an Arduino Uno pin output 3.3V instead of 5V when it is high (looking for a non PWM solution)? - Quora
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Connecting Arduino to 3.3V devices – lucadentella.it
