When setting a pin's pinMode to INPUT_PULLUP it uses an internal 20-50kohm resistor. Source
On the Arduino UNO, when setting the pinMode for pins 2 or 3 to INPUT_PULLUP, do both pins' internal resistors go to the same ground or does each internal resistor have it's own ground?
I intend to use both interrupt pins to do different functions, one function for when the pin reads from HIGH to LOW (FALLING) and a continuous action for when the pin reads LOW.
That is all, sincrely