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Arduino ADK R3, ATmega2560, USB Interface to Android Devices US$60.71

A000069
Arduino ADK R3, ATmega2560, USB Interface to Android Devices


The Arduino Mega ADK R3 is a microcontroller board with an ATmega2560. It has a USB host interface, via a MAX3421E IC, to connect with Android-based phones so you can create your own mobile accessories. It has 54 digital input/output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.

The ADK is based on the Arduino Mega 2560.

Similar to the Mega 2560 and Uno, it features an ATmega8U2 programmed as a USB-to-serial converter. This board is R3, making it compatible with newer Arduino shields that use additional pins. Arduino R3 adds SDA and SCL pins near the AREF pin, and two other new pins placed near the RESET pin. One is called IOREF, which allows R3 shields to adapt to the voltage provided from the board. The other new pin is not connected; it is reserved for future purposes. This board is still compatible with legacy Arduino Mega shields.

Two Android Communication Methods

Android Open Accessory Development Kit (ADK)

The Android Open ADK is part of the Android 3.1 platform and also has been back-ported to Android 2.3.4. The ADK allows an Android phone to act as USB Device, while the Arduino ADK board will act as USB Host. Using the ADK protocol requires at least an Android 2.3.4 platform with Google API 2.3.3 loaded, and a rooted device (i.e. a device that allows access privileges to Android's Linux subsystem).

MicroBridge

MicroBridge is a microcontroller implementation of the Android Debug Bridge (ADB). It allows stock, unrooted Android devices to talk directly to USB Host enabled microcontrollers, thus enabling phones to work with servos, drive DC motors, talk to I2C and SPI devices, read ADCs, etc. MicroBridge works on Android 1.5 and above.

Arduino ADK R3 Board Features

  • Microcontroller: ATmega2560
  • Operating Voltage: 5V
  • Input Voltage (recommended): 9V
  • Input Voltage (limits): 7-18V
  • Digital I/O Pins: 54 (of which 14 provide PWM output)
  • Analog Input Pins: 16
  • DC Current per I/O Pin: 40 mA
  • DC Current for 3.3V Pin: 50 mA
  • Flash Memory: 256 KB, of which 8 KB is used by bootloader
  • SRAM: 8 KB
  • EEPROM: 4 KB
  • Clock Speed: 16 MHz
  • USB Host Chip: MAX3421E
  • Dimensions: 101.52 53.3 mm
  • Weight: 36 g

The Arduino ADK can be powered via the USB connection or with an external power supply. The power source is selected automatically.

External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or a battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector.

Note: Because the ADK is a USB Host, your phone will attempt to draw power from it when it needs to charge. When the ADK is powered over USB, 500mA total is available for the phone and board. The external power regulator can supply up to 1500mA, of which 750mA is available for the phone and ADK board. The remaining 750mA is allocated for any actuators and sensors attached to the board. Your power supply must be capable of providing 1.5A to use this much current.

The board can operate on an external supply of 5.5 to 16 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.

The power pins are as follows:

  • VIN The input voltage to the Arduino board when it's using an external power source (as opposed to 5V from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
  • 5V The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.
  • 3V3 A 3.3V supply generated by the on-board regulator. Maximum current draw is 50 mA.
  • GND Ground pins.
  • IOREF This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V. The Mega ADK board has this pin tied to 5V.

About Arduino

Arduino is an open-source platform based on boards featuring an Atmel AVR microcontroller with a pre-programmed bootloader and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects, can be connected to software on your computer (e.g. Flash, Processing, MaxMSP), or, in this case, to software on an Android phone. The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux).

Arduino ADK R3 Documentation

Note about options below

If you choose the GSM/GPRS Module for Arduino add-on board below, you also will need a compatible antenna which is not included.


Optional Recommended Products for this Item
USB 2.0 Cable, 6ft., A-Male / B-Male+ US$6.00
Power Supply 3-12V DC, U.S. plug, 6 connection tips+ US$11.00
Power Supply 3-12V DC, US/UK/Euro/AU Plugs, 100-240VAC+ US$13.00
GSM/GPRS Module for Arduino+ US$103.00
2GB MicroSD Module for Arduino and Arduino Mega+ US$48.00

This product was added to our catalog on Friday 13 January, 2012.

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