I am wiring 15 limit switches to a project. 12 stepper motors are being controlled by Uno modules, 1 per motor (12 Uno modules total).
I understand that it is essentially the same to the Uno whether a digital input pin is high or low. Is it preferable to use pull up resistors due to less current being used?
Due to several numerous stepper motors and possible noise, I believe using external resistors is preferable. My other question is what value? I have read 1K, 3K, and 10K.
Also, is it recommended to use 100 ohm resistors to the input pin as shown in the diagram?