La ADK es basada en la Mega 2560. Ademas lleva un circuito USB que permite a esta placa de comunicarse con los dispositivos USB, y suministrarle tambien alimentazion.

Las características adicionales que vienen con la versión R3 son:

• ATmega 16U2 en vez de 8U2 como convertidor USB serial.
• 1.0 pinout: añadido SDA y SCL pines para TWI comunicación colocada cerca al pine AREF y dos pasadores de otras nuevas colocadas cerca del pine RESET, el IOREF que permiten que los escudos para adaptarse a la tensión proporcionada por la junta directiva y el segundo un no conectado pin, que se reserva para usos futuros.
• REINICIO del circuito mas fuerte.

Especificaciones técnicas

microprocesador	ATmega2560
Tensión de funcionamiento	5 V
Voltaje de entrada (recomendado)	7-12V
Voltaje de entrada (limites)	6-20V
Digital I/O Pines	54 (de los cuales 14 proporcionan salida PWM)
Pines de entrada analógica	16
DC Corriente por I/O Pine	40 mA
DC Corriente por 3.3V Pine	50 mA
Memoria flash	256 KB di cui 8 KB de los cuales 8 KB utilizadas por bootloader
SRAM	8 KB
EEPROM	4 KB
Velocidad de reloj	16 MHz

Para informaciones sobre el uso de la placa con el sistema operativo Android, hecha un vistazo en (documentación de Google ADK), para mas informaciones sobre la placa puede ver la pagina Mega ADK En la sección Hardware.

The Due has two usb connectors, the one with the micro-usb AB connector is the native one capable to act as an USB host, that means you can connect compatible external usb peripherals to the board, such as mouse, keyboards, smartphones. While the other USB port with the type B connector is intended for debugging purposes. If you want to give a closer look to this board we advise you to visit the officialArduino Due page in the Products Section.

Technical Specifications

Microcontroller	AT91SAM3X8E
Operating Voltage	3.3V
Input Voltage (recommended)	7-12V
Input Voltage (limits)	6-20V
Digital I/O Pins	54 (of which 12 provide PWM output)
Analog Input Pins	12
Analog Outputs Pins	2 (DAC)
Total DC Output Current on all I/O lines	130 mA
DC Current for 3.3V Pin	800 mA
DC Current for 5V Pin	800 mA
SRAM	96 KB (64 + 32 KB)
Clock Speed	84 MHz

If you want to give a closer look to this board we advise you to visit the officialArduino Due page in the Products Section.

The R3 version brings to this shield the 1.0 standard pinout that consist in 4 additional pins: 2 of them placed near the AREF pin, that are used for TWI communication, and the other 2 are placed near the RESET pin. The IOREF pin is used to adapt the shield to the board on which is mounted. The last one is not connected and is reserved for future uses. The latest revision of the shield adds a micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the Arduino Duemilanove and Mega (using the Ethernet library). It also adds a separate power-over-Ethernet (PoE) module can be soldered to the board to provide power from a conventional twisted pair Category 5 Ethernet cable. It is IEEE802.3af compliant, and works with all compliant PoE injectors currently available.

Summary

Because the Yún has two processors, the summary section shows the characteristics of each one in two separate tables.

AVR Arduino microcontroller
Microcontroller	ATmega32u4
Operating Voltage	5V
Input Voltage	5V
Digital I/O Pins	20
PWM Channels	7
Analog Input Channels	12
DC Current per I/O Pin	40 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	32 KB (of which 4 KB used by bootloader)
SRAM	2.5 KB
EEPROM	1 KB
Clock Speed	16 MHz
Linux microprocessor
Processor	Atheros AR9331
Architecture	MIPS @400MHz
Operating Voltage	3.3V
Ethernet	IEEE 802.3 10/100Mbit/s
WiFi	IEEE 802.11b/g/n
USB Type-A	2.0 Host/Device
Card Reader	Micro-SD only
RAM	64 MB DDR2
Flash Memory	32 MB
PoE compatible 802.3af card support

Schematic & Reference Design

Schematic: arduino-Yun-schematic.pdf

Power

It is recommended to power the board via the micro-USB connection with 5VDC.

If you are powering the board though the Vin pin, you must supply a regulated 5VDC. There is no on-board voltage regulator for higher voltages, which will damage the board.

The Yún is also compatible with PoE power supply but in order to use this feature you need to mount a PoE module on the board or buy a preassembled one.

The power pins are as follows:

• VIN. The input voltage to the Arduino board. Unlike other Arduino boards, if you are going to provide power to the board through this pin, you must provide a regulated 5V.
• 5V. The power supply used to power the microcontrollers and other components on the board. This can come either from VIN or be supplied by USB.
• 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
• GND. Ground pins.
• IOREF. The voltage at which the i/o pins of the board are operating (i.e. VCC for the board). This is 5V on the Yún.

Memory

The ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

The memory on the AR9331 is not embedded inside the processor. The RAM and the storage memory are externally connected. The Yún has 64 MB of DDR2 RAM and 16 MB of flash memory. The flash memory is preloaded in factory with a Linux distribution based on OpenWRT called Linino. You can change the content of the factory image, such as when you install a program or when you change a configuration file. You can return to the factory configuration by pressing the «WLAN RST» button for 30 seconds.

Input and Output

It is not possible to access the I/O pins of the Atheros AR9331. All I/O lines are tied to the 32U4.

Each of the 20 digital i/o pins on the Yún can be used as an input or output, using pinMode(), digitalWrite(), anddigitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:

• Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using the ATmega32U4 hardware serial capability. Note that on the Yún, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class. The hardware serials of the ATmega32U4 and the AR9331 on the Yún are connected together and are used to communicate between the two processors. As is common in Linux systems, on the serial port of the AR9331 is exposed the console for access to the system, this means that you can access to the programs and tools offered by Linux from your sketch.
• TWI: 2 (SDA) and 3 (SCL). Support TWI communication using the Wire library.
• External Interrupts: 3 (interrupt 0), 2 (interrupt 1), 0 (interrupt 2), 1 (interrupt 3) and 7 (interrupt 4). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details. Is not recommended to use pins 0 and 1 as interrupts because they are the also the hardware serial port used to talk with the Linux processor. Pin 7 is connected to the AR9331 processor and it may be used as handshake signal in future. Is recommended to be careful of possible conflicts if you intend to use it as interrupt.
• PWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with the analogWrite() function.
• SPI: on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Yún’s 6-pin ICSP header, the shield will not work.

The SPI pins are also connected to the AR9331 gpio pins, where it has been implemented in software the SPI interface. This means that the ATMega32u4 and the AR9331 can also communicate using the SPI protocol.

• LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off.
• There are several other status LEDs on the Yún, indicating power, WLAN connection, WAN connection and USB.

• Analog Inputs: A0 – A5, A6 – A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Yún has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function.
• AREF. Reference voltage for the analog inputs. Used with analogReference().

There are 3 reset buttons with different functions on the board:

• Yún RST. Bring this line LOW to reset the AR9331 microprocessor. Resetting the AR9331 will cause the reboot of the linux system. All the data stored in RAM will be lost and all the programs that are running will be terminated.

• 32U4 RST. Bring this line LOW to reset the ATmega32U4 microcontroller. Typically used to add a reset button to shields which block the one on the board.
• WLAN RST. This button has a double feature. Primarly serves to restore the WiFi to the factory configuration. The factory configuration consist to put the WiFi of the Yún in access point mode (AP) and assign to it the default IP address that is 192.168.240.1, in this condition you can connect with your computer to the a WiFi network that appear with the SSID name «Arduino Yun-XXXXXXXXXXXX», where the twelve ‘X’ are the MAC address of your Yún. Once connected you can reach the web panel of the Yún with a browser at the 192.168.240.1 or «http://arduino.local» address. Note that restoring the WiFi configuration will cause the reboot of the linux environment. To restore your WiFi configuration you have to press and hold the WLAN RST button for 5 seconds. When you press the button the WLAN blue LED will start to blink and will keep still blinking when you release the button after 5 seconds indicating that the WiFi restore procedure has been recorded. The second function of the WLAN RST button is torestore the linux image to the default factory image. To restore the linux environment you must press the button for 30 seconds. Note that restoring the factory image make you lose all the files saved and softwares installed on the on-board flash memory connected to the AR9331.

See also the mapping between Arduino pins and ATmega32u4 ports.

Communication

The Yún has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. TheATmega32U4 provides a dedicated UART TTL (5V) serial communication. The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer.

Digital pins 0 and 1 are used for serial communication between the 32U4 and the AR9331. Communication between the processors is handled by the Bridge library.

A SoftwareSerial library allows for serial communication on any of the Yún’s digital pins except for pins 0 and 1.

The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. For SPI communication, use the SPI library.

The Yún appears as a generic keyboard and mouse, and can be programmed to control these input devices using theKeyboard and Mouse classes.

The onboard Ethernet and WiFi interfaces are exposed directly to the AR9331 processor. To send and receive data through them, use the Bridge library. To configure the interfaces, you can access the network control panel as described in thegetting started page.

The Yún also has USB host capabilities through Linino. You can connect peripherals like USB flash devices for additional storage, keyboards, or webcams. You may need to download and install additional software for these devices to work. For information on adding software to the AR9331, refer to the notes on using the package manager.

Programming

The Yún can be programmed with the Arduino software (download). Select «Arduino Yún from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials.

The ATmega32U4 on the Arduino Yún comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol.

You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.

Automatic (Software) Reset and Bootloader Initiation

Rather than requiring a physical press of the reset button before an upload, the Yún is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Yún’s virtual (CDC) serial / COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial / COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Yún. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader.

Because of the way the Yún handles reset it’s best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can’t reset the board you can always start the bootloader by pressing the reset button on the board.

USB Overcurrent Protection

The Yún has a resettable polyfuse that protects your computer’s USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

Physical Characteristics

The maximum length and width of the Yún PCB are 2.7 and 2.1 inches respectively, with the USB connector extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16″), not an even multiple of the 100 mil spacing of the other pins.

Using your Yun

There is an extensive Getting Started Guide and a number of tutorials found on the library reference page.

Features

With this Ethernet Shield, your Arduino board can be used to connect to internet. Can be used as server or client. Directly plug puzzle board, no soldering required. Controller: w5100. This is the latest version of the Ethernet Shield. This Arduino Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your Arduino Online. It is directly supported by Arduino official Ethernet Library. It adds a micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the Arduino Duemilanove (168 or 328), Uno as well as Mega (1280/2560) and can be accessed using the SD library. The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library to write sketches which connect to the internet using the shield. Fits all version of arduino Main board,2009,UNO, mega 1280, mega 2560. Size:7cm x 5.4cm x 2.4cm – 2.76inch x 2.12inch x 0.94inch. MAC address: 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };. Package Included: 1 x Ethernet Shield NO Retail Box. Packed Safely in Bubble Bag.

The chip can connects to external detecting resistor to give the variations to the control circuit.Using L298N chip to drive the motor,this chip can drive a stepping motor or four phase stepping motor, and two DC motors as well.
Descargar liberia para Arduino L298N

Product Features

• 5V 1-Channel Relay interface board, and each one needs 15-20mA Driver Current
• Equiped with high-current relay, AC250V 10A ; DC30V 10A
• Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
• Indication LED»s for Relay output status

Manuales de uso: 8 channel relay 8 Relay Module

Product Features

• 5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current
• Equiped with high-current relay, AC250V 10A ; DC30V 10A
• Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
• Indication LED»»s for Relay output status

Manuales de uso: 8 channel relay 8 Relay Module

Product Features

• 5V 8-Channel Relay interface board, and each one needs 15-20mA Driver Current
• Equiped with high-current relay, AC250V 10A ; DC30V 10A
• Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
• Indication LED’s for Relay output status

Manuales de uso: 8 channel relay 8 Relay Module

• Standard double panel design,fine workmanship, board size:38mm X 30mm
• Use ULN2003 drive chip,500mA
• In stepping motor port, four channels highlight SMD green LED diode indicates working status
• In DC motor port, one channel highlight SMD green LED diode indicates working status
• Power light:highlight red SMD LED diode
• Equipped with stepping motor standard interface and DC motor standard interface,can directly call waiting when using
• Choose through red short circuit hat,support different working voltage motors

Connect short circuit hat, choose 5V as the working voltage for steeping motor/DC motor Take off short circuit hat,steeping motor/DC motor can choose external voltage for power supply through pins

Wiring method

The wiring method for stepping motor: Left 1 N 1 ? 1 N 4 connect to the four corresponding IO wires of MCU The right black pins are defined from top to VCC,A,B,C,D ? connect to the concentric line,phase A,B,C,D of stepping motor)s

The wiring method for DC motor

Left 1 N1 ? 1 N 4 connect correspondingly to the four IO wires of MCU The right black pins are defined as:below is VCC

Power supply method

Connect short circuit hat,choose 5V as the working voltage for stepping motor/DC motor Take off short circuit hat,stepping motor/DC motor can choose external voltage for power supply via pins

• Speed down stepping motor
• Diameter:28mm
• Voltage:5V
• Stepping angle:5.625 X 1/64
• Speed reduction ratio:1/64

Five lines four phases,can be driven by common uln2003, can be used as connecting two phase;can be used with PCB board, direct plug and socket,easy to use on PCB board.
Descargar Librería para Arduino ULN2003+5V Stepper_Motor