2 x Atmega328P-PU Arduino Bootloader installed (for UNO R3)

Atmega328 Programmer Shield for Arduino UNO - DIY Kit

Arduino Pro Mini 3.3V 8MHz Atmega328P (for Arduino IDE)

For Arduino UNO R3 Shield Board Prototype PCB Atmega328P 2.54mm Pitch Breadboard

Pro Mini Enhancement ATMEGA328P 16MHz 5V Compatible Arduino PRO Module

NANO V3 USB-C (USB 2.0) Atmega328, CH340 (for Arduino)

3 x CANADUINO® Arduino Screw Terminal Adapter for Nano Atmega328P

For Arduino UNO R3 Shield Board Prototype PCB Atmega328P 2.54mm Pitch Breadboard