The PCB Martin has designed takes the form of a small but versatile PCB based on Atmega328P Arduino Pro Mini board, ... – 4 analog pins if 1×4 keypad used.

Feather 328P Atmega328P Development Board ... 19 GPIO pins + 2 analogue-in-only pins, 6 x PWM pins, 8 x analogue inputs ... with a USB bootloader that lets you quickly use it with the Arduino IDE.

It transpires that some Arduino inputs are better at tolerating slowly-changing inputs than others. For example, ATmega328P (Figure 13-2, Arduino Uno and Nano) and ATmega32U4 (Figure 10-2, Arduino ...

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 ...

Sometimes the simplest things in life are the most beautiful. [The Tweaker] has soldered an LED circle on the top of an ATmega328P chip, and it looks great. Using nothing more than some solder, wir… ...