DFRduino Uno V3.0 from DFRobot is a physical world computing board of small size for academics or development . It is a simple microcontroller board fully compatible with Arduino UNO R3 and Arduino IDE open-source development environment. This environment implements the Processing / Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux). This board features the ATmega16U2 programmed as a USB-to-serial converter. An added bonus is that our DFRduino is still using the DIP package AVR Chip. You could remove it to update or reprogram the chip's firmware, or even to place it on a finished, more compact project. The cool thing about our new DFRduino microcontroller is that the headers use different colors to feature I/O ports of different types: Red for Power Section. Blue for Analog I/O. Green for Digital I/O. These colors match our sensor cables. This makes it really easy to figure out where to connect sensors, or to identify which side is Analog (blue) or Digital (green). "Arduino Uno" is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. This board added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the "Arduino Due" that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes. DFRobot Microcontrollers compatible with Arduino 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
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