How can I use this arduino coupler to input into the Arduino? 4N25-000E - Optocoupler, Transistor Output, 1 Channel, DIP, 6 Pins, 80 mA,... The 4N25-000E is a 1-channel 6-pin Phototransistor Optocoupler for general purpose applications. It contains a light emitting diode optically coup…

How to use a transistor with arduino

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