This way the microcontroller is concerned with the encoder signal only when a new pulse comes. Since the interrupt signal comes from outside the Arduino it is called as external interrupt. Arduino Uno ...

“I looked at all the available rotary encoder sketches and none of them ... which is much slower than reading the port pins directly, and it spends (wastes) some time reporting serial data to the host ...

Enter the ExtraCore library for Arduino, a software library that turns two or more Arduinos into a multi-core microcontroller with more pins than you’ll ever need. The ExtraCore library comes ...

[Rafael] just made a little library that allows you to interface these modules to the Atmega328p-based Arduino UNO in order ... the Arduino platform. The 30-pin SIMM shown above is capable ...