Resource

DFRobot Arduino Compatible Microcontroller Selection Guide
WIKI (DFRduino Romeo-All in one Controller)
Romeo schematic(Compatible with both v1.1 and v1.2)
Romeo Layout
Romeo pinout Diagram
Romeo Tutorial French Version
Getting Started with DFRduino Romeo (German Language)
RC Hack based on Romeo
Hongkong biped robot using Romeo
Schematic (V1)

The DFRobot Romeo is a versatile all-in-one robot control board designed for robotics applications. Developed by DFRobot, it leverages the Arduino open-source platform, offering compatibility with a vast library of open-source codes and the ability to easily expand its functionality with various shields. This feature-rich board includes an integrated 2-way DC motor driver and a wireless socket, making it an ideal choice for starting your robot project without the need for an additional motor driver. Additionally, Romeo is equipped with extra power capabilities to support servos that require higher current.
Romeo also boasts compatibility with DFRobot’s standard 3-pin-out design, making it seamlessly compatible with the Gravity series of sensors and actuators. With this integration, hundreds of sensors can be conveniently plugged and played with Romeo.
This board, the inaugural member of the Romeo family, was introduced in 2009. It not only marked the advent of the very first Arduino-compatible robot controller but also stood as the first Arduino-derived board in the market. The current version of Romeo is based on the Arduino Uno platform, featuring built-in 2x2A DC motor drivers and a socket for Bluetooth or APC220 Radio Communication Module communication. The integrated I/O sensor pinout facilitates the connection of numerous Gravity-compatible sensors and modules. Additionally, Romeo includes a plug-and-play servo connector, making it the ideal controller for constructing your custom robot.

Key Features

Microcontroller: ATmega328 with Arduino Uno bootloader, fully compatible with Arduino Uno pin mapping and the standard Arduino IDE
Integrated Dual-Channel Motor Driver: 2-channel H-bridge motor driver with up to 2A maximum current per channel for direct DC motor control without a separate motor shield
DC Supply: USB-powered for development or external 7-12V DC for deployment, with auto-sensing and automatic power input switching between sources
DC Output: Regulated 5V and 3.3V onboard outputs plus external power output for peripheral and sensor supply
8-Channel 10-Bit Analog I/O: 8 analog input channels at 10-bit resolution for broad sensor compatibility across environment-aware robotics builds
5 Onboard Key Inputs: Dedicated local push-button inputs without consuming general-purpose digital I/O pins
Wireless Expansion Sockets: Integrated sockets for APC220 RF module and DFRobot Bluetooth module for wireless remote control and telemetry without additional wiring
3 I2C Interface Pin Sets: 3 I2C pin sets including 2 right-angle 90-degree headers for direct multi-peripheral I2C bus connections without splitter modules
Serial Interface: TTL-level serial interface for UART communication with external sensors, modules, and host devices
ICSP Header: In-circuit serial programming header for direct bootloader programming and firmware download without USB
Male and Female Pin Header Support: Accepts both male and female pin headers for flexible peripheral and shield connection configurations
Gold-Plated PCB: Gold-plated contact surfaces across all I/O pins and connectors for improved corrosion resistance and long-term solder joint reliability
Compact All-in-One Layout: 90 x 80mm form factor consolidates motor driver, wireless sockets, I2C expansion, and full Arduino Uno-compatible I/O onto a single board

Applications

Arduino Uno-compatible robotics platforms requiring integrated dual-channel DC motor control without discrete motor shield stacking
Wheeled and tracked robot chassis builds with 2-motor drive systems drawing up to 2A per channel
RF- and Bluetooth-connected remote-control robots using APC220 and DFRobot Bluetooth module expansion sockets
Multi-sensor robotics and automation builds requiring 8-channel analog input and multiple I2C peripheral connections
Educational robotics kits and STEM project platforms require a comprehensive all-in-one Arduino-compatible control board
Autonomous and semi-autonomous ground vehicle builds requiring onboard motor drive, wireless communication, and sensor I/O from a single board.