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| Name | DFRduino UNO | DFRobot Leonardo | DFRobot Mega 2560 | Romeo V2 | Romeo |
| SKU | DFR0216 | DFR0221 | DFR0191 | DFR0225 | DFR0004 |
| Microcontroller | ATmega328p | ATmega32u4 | ATmega2560 | ATmega32U4 | Atmega328 |
| Working voltage | 5V | 5V | 5V | 5V | 5V |
| CPU Frequency | 16MHz | 16MHz | 16MHz | 16MHz | 16MHz |
| TIO ports / PWM | 6 / 14 | 7 / 20 | 54 / 15 | 20 / 7 | 14 / 6 |
| Analog inputs | 6 | 12 | 16 | 12 | 8 |
| UART | 1 | 2 | 4 | 2 | 1 |
| I2C | 1 | 1 | 2 | 3 | 3 |
| SPI | 1 | 1 | 1 | 1 | 1 |
| Interrupt pins | 2 | 2 | 2 | 2 | 2 |
| EEPROM[KB] | 1 | 1 | 4 | 1 | 1 |
| Flash[KB] | 32 | 32 | 256 | 32 | 32 |
| SRAM[KB] | 2 | 2.5 | 8 | 2.5 | 2 |
| USB |
A-B USB cable |
micro USB cable |
A-B USB cable |
micro USB cable |
A-B USB cable |
| Dimension | 75*55*15mm | 75*55*15mm | 100*53*15mm | 89*84*14mm | 90*80*14mm |
| Vin | 7-12V | 7-12V | 7-12V | 7-12V | 7-12V |
| Price | $19.9 | $19.9 | $24.9 | $34.95 | $29.5 |
| Weight（g） | 45 | 50 | 70 | 80 | 80 |
| IDE version | Arduino 1.0 and above | Arduino 1.0 and above | Arduino 1.0 and above | Arduino 1.0 and above | Arduino 1.0 and above |
| Feature | DFRduino UNO is fully compatible with Arduino UNO R3,suitable for Arduino beginner and hobbyists | DFRobot Leonardo is a low cost controller, integrated with Xbee and SPI. Suitable for low cost and communication demand of hobbyists | DFRduino Mega has 54 digital pins and 16 analog pins, 4 UART channels. Suitable for demands of vast sensors | Use ATmega32u4, 2 serial ports. Intergrated with Xbee socket and motor drivers | Microcontroller with motor driver, communication ports, IO expansion ports, it can be used as the main controller of robots |
1. Project: Sunflower - Arduino Solar Tracker
Introduction: 'The Sunflower' is an Arduino based solar tracker which will increase the efficiency of the solar panel while charging.
2. Project: Zelda Song Player
Introduction: Assemble an Arduino Uno-based device to recreate an N64 controller to play the first six songs from the Legend of Zelda: Ocarina of Time!
3. Project: E-Paper display with Arduino from DFRobot
Introduction: In this video, we learn how to use an E-Paper display with an Arduino board.
4. Project: CAT-BOT
Introduction: I used to dream of my kitty talking to me and now I am going to make my toy kitty react to my actions and even CHAT WITH ME!
5. Project: How To Make LED Kitchen Sink Lights with a PIR Sensor, Arduino, and 3D Printing
Introduction: I wanted to brighten up my kitchen and install some lights under the sink, but rather than buy a pre-made LED kit, I decided to make my own. Let me show you how I made this!
