Furthermore, the processor's pins, and pin change interrupts, are grouped into “port”s, so for example on the Arduino Uno there are three ports and therefore only 3 interrupt vectors (subroutines) ...

This code makes use of the first (INT0) external interrupt of the Arduino-Uno. This time, an external LED (on PIN7) is used as a demonstration that bit masking is important so as not to accidentally ...

This article is completely focused on Arduino UNO only, if you want to know about the other options you can check out our previous article on Different Types of Arduino Boards where we have compared ...