I have a project where I have 16 LEDs and a RTC and a button connected to my UNO and I also used the lilypad. Hooked the RTC to A4 and A5 and the button to pin 11. I have been using pin 1 to drive an LED and one the program is uploaded, it works fine. When building this exact project on the Pro Min…

I/O pins in Pro Mini vs. Uno

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