So I have a stupid idea, would there be a way to use LED's lighting up as a password, so if it reads 4 pins as high it would output something to a screen/serial?
Your question is confusing. You can read the state of GPIO input pins and test if they match a pattern for the password, but what does the LEDs have to do with that?
My bad! I was using the LEDs as an example for pins being high. Thank you for the pattern info though!
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