Amazon.com: Btoociya UNO R3 Board ATmega328P with CH340G Chip Compatible with Arduino UNO R3 Mega 2560 Nano Robot for Arduino IDE AVR MCU Learner K53,with Straight Pin Header and USB Cable :
Arduino Comparison Guide - SparkFun Learn
Schematic of Arduino UNO input/output pins and Atmega328 pins... | Download Scientific Diagram
File:Pinout of ARDUINO Board and ATMega328PU.svg - Wikimedia Commons
Arduino Uno Board : Features, Pin Configuration, and Its Applications
arduino uno atmega328 : Pinout cable and connector diagrams-usb, serial rs232,rj45 ethernet, vga, parallel, atx, dvi...
ATMega328P Microcontroller Pinout, Pin Configuration, Features & Datasheet
Arduino Uno Board : Features, Pin Configuration, and Its Applications