Nano to ATmega328 DIP-28 Adapter

A compact adapter PCB that lets an Arduino Nano plug into a standard ATmega328/ATmega328P 28-pin DIP socket. The board maps the Nano’s Arduino pinout to the equivalent ATmega328 DIP pins, making it useful for upgrading or testing existing bare-chip Arduino-style circuits without removing firmware/programming convenience.

Designed for projects where an ATmega328 DIP chip is normally socketed, but USB programming through a Nano is preferred. The adapter keeps the footprint close to the Nano size and brings the DIP pins out underneath for direct socket insertion.

Arduino Nano header footprint

ATmega328 DIP-28 plug footprint

D0-D13 mapped to matching ATmega328 pins

A0-A5 mapped to matching analog/I2C pins

RESET, 5V, and GND routed

DIP crystal pins 9/10 left unconnected

Optional 5V link/jumper between target and Nano power

Two-layer PCB

Through-hole friendly design

Check orientation carefully before use. This adapter is intended for 5V/16MHz Nano-compatible circuits and assumes the target board already uses the standard ATmega328 DIP pinout.