Arduino Mega ADK User Manual

Arduino Mega ADK
User Manual
Getting Started
In the Getting Started section, you can find all the information you need to configure your
board, use the Arduino Software (IDE), and start to tinker with coding and electronics.
Power
The Arduino MEGA 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 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.
NB: Because the MEGA ADK is a USB Host, the 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. 750mA is
available for the phone and MEGA ADK board. An additional 750mA is allocated for any
actuators and sensors attached to the board. A 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
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more than 12V, the voltage regulator may overheat and damage the board. The recommended
range is 7 to 12 volts.

Arduino Mega ADK Specifications

General

Microcontroller	ATmega2560
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limits)	6-20V
Digital I/O Pins	54
PWM Pins	15
Analog Input Pins	16
DC Current per I/O Pin	20 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	256 KB
SRAM	8 KB
EEPROM	4 KB
Clock Speed	16 MHz
USB Host Shield	Yes
Android Accessory Interface	Yes
USB Host Chip	MAX3421E

Summary

Getting Started with Arduino Mega ADK

Powering the Arduino Mega ADK

Power Sources and Connections

Details on powering the board via USB, external adapter, or battery, including voltage requirements and current limits.

Power Pins Description

Explanation of VIN, 5V, 3V3, GND, and IOREF pins for managing power input and output on the board.

Arduino Mega ADK Memory and I/O

Memory Specifications

Details on the MEGA ADK's flash memory, SRAM, and EEPROM capacities for code storage and data.

Digital and Analog Input/Output

Overview of digital pins, their modes, current limits, and specialized functions like Serial, Interrupts, PWM, and SPI.

Communication Interfaces

Serial, TWI, and SPI Communication

Explanation of TTL serial (UART), TWI (I2C), and SPI communication protocols supported by the ATmega2560.

USB Host Interface

Details on the MAX3421E IC for USB host functionality, enabling interaction with various USB devices.

Programming and Resetting

Arduino Mega ADK Programming Methods

Information on uploading code via bootloader, ICSP, and ATmega8U2 firmware programming (DFU mode).

Automatic Software Reset Feature

How the DTR line facilitates automatic resets for code uploads and its behavior on different operating systems.

Hardware Features and Compatibility

USB Overcurrent Protection

Description of the resettable poly fuse protecting USB ports from shorts and overcurrent.

Physical Characteristics and Shield Compatibility

Details on PCB dimensions, screw holes, and compatibility with shields designed for other Arduino models.