I have a project where I have three pins to use and I just realized it would be better to use a memory card than replacing the code each time.
I'm building a Arduino with a push button. Press the button and it sends keystrokes to the connected computer with login details.
The login details need to change every three months so having that on a memory card will be easier.
So since I use a digispark Attiny 85 with a total of 6 pins (where two is used to send the keystrokes).
I have one to the push button, and three pins left.
Is there any card reader that can work with three pins? I only need to read if that makes a difference.
The ones I find use four pins (+ vcc and gnd).
Pretty much any memory card type is ok.