But what exactly are these PWM pins, and how do you use them? Read more: Major Motherboard Brands Ranked Worst To Best The Arduino Mega's PWM pins are digital output pins located on D2 to D13 and ...

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 ...

Some other solutions for extra IO would be to buy an Arduino Mega with 54 digital IO pins or the Muxshield which gives you 48 IO (and is stackable for other shields). An advantage of using the two ...