This part of AVR tutorial will teach you how to make your own Arduino chip, ie Atmega328P with Arduino Bootloader. First we need one blank Atmega328P-PU microcontroller with a few supproting ...

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.

The 30-pin SIMM shown above is capable of storing up to (hold on to your chairs…) 16MB but due to limited amount of available IOs on the Atmega328p only 256KB can be used.

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 ...

The Uno also has a limited number of pins, making it difficult to work with when the project requires plenty of input and output components. However, these two areas are where the Arduino Mega shines.