![Noob question] Can you use an optocoupler to act as a button for input/output? - General Electronics - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/1/8/0/180d731ce7664d2c2cef307dc5e931b617132347.png "Noob question] Can you use an optocoupler to act as a button for input/output? - General Electronics - Arduino Forum")
Noob question] Can you use an optocoupler to act as a button for input/output? - General Electronics - Arduino Forum
Calculating resistor for optocoupler
Question about design / input optocoupler
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