Atmega328P microcontroller:

The ATmega328P is a high-performance picoPower 8-bit AVR RISC-based microcontroller having 32KB ISP flash memory with read-while-write capabilities created by Atmel from the megaAVR family.

Atmega indicates the family name

32 indicates the 32 KB Flash Memory

8 indicates an 8-bit processor

P indicates picoPower (Consumes very low power)Atmega328P Pinout

Atmega328P Pinout

I have mentioned all the Atmega328 pinout details with related Arduino functions. So this pinout diagram will be very helpful as you can easily identify the digital and analog I/O pins of the Atmega328P microcontroller.

Atmega328P without Arduino circuit

Before designing the DIY Arduino PCB, I have made the complete circuit on the breadboard for testing. You can also use a 5V mobile charger to supply the circuit.

In this tutorial video, I have explained how make Arduino circuit on breadboard using Atmega328P microcontroller.

Required Components

ATmega328P with bootloader

16MHz Crystal

LED 5-mm

10k & 470-ohm Resistors

22pF Capacitors 2no

100nF (104) Capacitor

10uF Capacitors 2no

AMS1117 5v Regulator

Push switch

IN4001 Diode

2mm Pitch Female BERG Strip

FTDI232 USB to Serial

Arduino PCB

Designing the PCB

After testing the circuit on the breadboard, I have designed the PCB for this Atmega328P project.

This circuit has all the features of Arduino UNO, but the size is smaller and the cost is also low.

I have ordered the PCB from PCBWay.com. The PCB quality is very good in this affordable price range. You can also try PCBWay.com to order any custom design PCB.