Since the Arduino series has an open-source hardware license, you can even come across clone boards that offer nearly all the features of Arduino boards at inexpensive prices. As if that’s not ...

PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

Some Arduino boards feature the I2C pins in different places, and you can check out the full hardware requirements for all Arduino boards on the Wire Library Reference page.