Question

How many pins are available for interrupt functions in the Arduino Uno?

(a) No pins

(b) All pins except pin 2 and 3

(c) Only pin 2

(d) Only pins 2 and 3

I had been asked this question in an interview for internship.

Question is taken from Interrupt Service Routine topic in section Arduino Programming of Arduino

Answer 1

Correct option is (b) All pins except pin 2 and 3

The explanation is: ISR allows to initiate an interrupt routine in any Arduino Board. The interrupt service routine can be used to automate a number of functions in an Arduino. Usually a number of pins are assigned for any Board. The Arduino Uno has ISR functionality enabled for only pins 2 and 3.