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Project 1. Hyduino - Automated Hydroponics with DFRduino Mega2560
Introduction: Hydroponics is growing plants without the use of a traditional dirt medium by using a nutrient-rich water solution. This is especially great for those people that have limited areas in their backyard to grow in.
Project 2. Simple Arduino based Bioresonance Therapy device, RIFE Machine.
Introduction: The purpose of this project was to explain how to make such a device yourself with "professional" features whose complete cost does not exceed twenty-five dollars. This is how I want to capture the real value of such devices that are sold today on the Internet.
DFRduino Mega2560 is an ATmega2560-based microcontroller that provides full compatibility with "Arduino MEGA2560“. It features 54 digital I/O ports, 16 analog signal input ports, 4 UARTs(hardware serial ports), and a 16MHz crystal oscillator. The board comes with a bootloader that enables users to download programs directly via a USB. You can simply power it with a USB cable or a standard adapter or use a battery as external power. Mega 2560 has 256KB FLASH, two times of Mega1280, which could offer a larger create space for your projects.
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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 beginners 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. Integrated 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 |
SparkFun Original
SparkFun Original
SparkFun Produkt
China export
SparkFun Original
SparkFun Original
DFRobot
SparkFun Original
SparkFun Original
DFRobot