Arduino Mega 2560 R3 - Serial Port Basics

54 digital I/O, 15 which support PWM, 16 analog inputs and 4 serial ports.

Mega 2560 R3 with CH340 USB

Arduino Mega 2560 R3 - Serial Port Basics

Would this work for octoprint? : r/octoprint

Mega 2560 R3 with CH340 USB - ProtoSupplies

How to do serial communication between two boards?

KEYESTUDIO Leonardo R3 Microcontroller Development Board with USB Cable Kit for Arduino Project : Electronics

DFRduino Mega2560 (Arduino Mega 2560 R3 Compatible) – ELEDIY

The MEGA 2560 Development Board for Arduino IDE is based on the ATmega2560 MCU with 16MHz and provides 54 digital ports and 16 analog inputs; 4 UARTs

MEGA 2560 R3 Development Module with CH340 USB UART - Compatible with Arduino MEGA2560

Keyestudio MEGA 2560 R3 Development Board With USB Serial Chip CP2102

Open-source prototype boards (A) Uno R3 and (B) Mega 2560 R3 (both from

UCTRONICS Ultimate Starter Learning Kit for Arduino MEGA - RobotShop

ESP32 UART TUTORIAL AND BASIC DEMO - How to connect ESP32 to Arduino Uno Step by Step