[Noisebridge-discuss] Fwd: [Swarm] Arduino Mega spotted in the wild!
jim
jim at well.com
Mon Mar 30 22:08:51 UTC 2009
i'd like to get one, but currently have no clue
how to get started with it. it would be helpful,
at least comforting, to see a link or two to a
tutorial or tutor or Noisebridge study group.
i'll hold my breath and sign up.
On Mon, 2009-03-30 at 15:01 -0700, Christie Dudley wrote:
> Corey and I have been talking about going in on an order. I was
> thinking it'd be cool to see if other folks from NB wanted to get in
> on this too. I'd like to get the order sent out by Thursday morning.
>
> I've made a wiki page for signing up at:
> https://www.noisebridge.net/wiki/Mega_Arduino_Order - we can do this
> the way we usually do bulk orders.
>
> ---------- Forwarded message ----------
> From: Corey McGuire <coreyfro at coreyfro.com>
> Date: 2009/3/30
> Subject: [Swarm] Arduino Mega spotted in the wild!
> To: Swarm <swarm at lee.org>
>
>
> Arduino Mega spotted in the wild! Who wants to jump in on an order?
> Discounts at 5 and 10 http://tr.im/ardmega http://tr.im/megashield
>
> $65.00, 2/$123.50, 10/$585.00, 50/$2,600.00, 100/$4,875.00
> Special Offer
> * Offer includes one FREE MEGAshield PCB per Arduino MEGA board,
> valued at $6.50 each
>
>
>
> Arduino MEGA requires Arduino IDE 0015 or newer
>
>
>
> Overview
> The Arduino Mega is a microcontroller board based on the ATmega1280
> (datasheet). 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. 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. The Mega is compatible with most shields designed for the
> Arduino Duemilanove or Diecimila.
>
>
>
>
> Schematic & Reference Design
> EAGLE files: arduino-mega-reference-design.zip Δ
>
> Schematic: arduino-mega-schematic.pdf
>
>
> Summary
>
>
>
>
> Microcontroller
> ATmega1280
> Operating Voltage
> 5V
> Input Voltage (recommended)
> 7-12V
> Input Voltage (limits)
> 6-20V
> 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
> 128 KB of which 4 KB used by
> bootloader
> SRAM
> 8 KB
> EEPROM
> 4 KB
> Clock Speed
> 16 MHz
>
>
>
> Power
> The Arduino Mega 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.
>
> The board can operate on an external supply of 6 to 20 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 5 volts 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 3.3 volt supply generated by the on-board FTDI chip.
> Maximum current draw is 50 mA.
>
> * GND. Ground pins.
> Memory
> The ATmega1280 has 128 KB of flash memory for storing code (of which 4
> KB is used for the bootloader), 8 KB of SRAM and 4 KB of EEPROM (which
> can be read and written with the EEPROM library).
>
>
> Input and Output
> Each of the 54 digital pins on the Mega can be used as an input or
> output, using pinMode(), digitalWrite(), and digitalRead() 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); Serial 1: 19 (RX) and 18 (TX);
> Serial 2: 17 (RX) and 16 (TX); Serial 3: 15 (RX) and 14 (TX).
> Used to receive (RX) and transmit (TX) TTL serial data. Pins 0
> and 1 are also connected to the corresponding pins of the FTDI
> USB-to-TTL Serial chip.
> * External Interrupts: 2 (interrupt 0), 3 (interrupt 1), 18
> (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21
> (interrupt 2). 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.
> * PWM: 0 to 13. Provide 8-bit PWM output with the analogWrite()
> function.
> * SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). These pins
> support SPI communication, which, although provided by the
> underlying hardware, is not currently included in the Arduino
> language. The SPI pins are also broken out on the ICSP header,
> which is physically compatible with the Duemilanove and
> Diecimila.
>
> * 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.
> * I2C: 20 (SDA) and 21 (SCL). Support I2C (TWI) communication
> using the Wire library (documentation on the Wiring website).
> Note that these pins are not in the same location as the I2C
> pins on the Duemilanove or Diecimila.
>
> The Mega has 16 analog inputs, each of which provide 10 bits of
> resolution (i.e. 1024 different values). By default they measure from
> ground to 5 volts, though is it possible to change the upper end of
> their range using the AREF pin and analogReference() function.
>
>
>
> There are a couple of other pins on the board:
>
> * AREF. Reference voltage for the analog inputs. Used with
> analogReference().
> * Reset. Bring this line LOW to reset the microcontroller.
> Typically used to add a reset button to shields which block
> the one on the board.
> Communication
> The Arduino Mega has a number of facilities for communicating with a
> computer, another Arduino, or other microcontrollers. The ATmega1280
> provides four hardware UARTs for TTL (5V) serial communication. An
> FTDI FT232RL on the board channels one of these over USB and the FTDI
> drivers (included with the Arduino software) provide a virtual com
> port to software on the computer. 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 FTDI chip and USB connection to the
> computer (but not for serial communication on pins 0 and 1).
>
>
>
> A SoftwareSerial library allows for serial communication on any of the
> Mega's digital pins.
>
> The ATmega1280 also supports I2C (TWI) and SPI communication. The
> Arduino software includes a Wire library to simplify use of the I2C
> bus; see the documentation on the Wiring website for details. To use
> the SPI communication, please see the ATmega1280 datasheet.
>
>
>
>
> Programming
> The Arduino Mega can be programmed with the Arduino software
> (download). For details, see the reference and tutorials.
>
> The ATmega1280 on the Arduino Mega 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 original
> STK500 protocol (reference, C header files).
>
>
>
> 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
> Rather then requiring a physical press of the reset button before an
> upload, the Arduino Mega is designed in a way that allows it to be
> reset by software running on a connected computer. One of the hardware
> flow control lines (DTR) of the FT232RL is connected to the reset line
> of the ATmega1280 via a 100 nanofarad capacitor. When this line is
> asserted (taken low), the reset line drops long enough to reset the
> chip. The Arduino software uses this capability to allow you to upload
> code by simply pressing the upload button in the Arduino environment.
> This means that the bootloader can have a shorter timeout, as the
> lowering of DTR can be well-coordinated with the start of the upload.
>
> This setup has other implications. When the Mega is connected to
> either a computer running Mac OS X or Linux, it resets each time a
> connection is made to it from software (via USB). For the following
> half-second or so, the bootloader is running on the Mega. While it is
> programmed to ignore malformed data (i.e. anything besides an upload
> of new code), it will intercept the first few bytes of data sent to
> the board after a connection is opened. If a sketch running on the
> board receives one-time configuration or other data when it first
> starts, make sure that the software with which it communicates waits a
> second after opening the connection and before sending this data.
>
>
>
> The Mega contains a trace that can be cut to disable the auto-reset.
> The pads on either side of the trace can be soldered together to
> re-enable it. It's labeled "RESET-EN". You may also be able to disable
> the auto-reset by connecting a 110 ohm resistor from 5V to the reset
> line; see this forum thread for details.
>
>
> USB Overcurrent Protection
> The Arduino Mega 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 and Shield Compatibility
> The maximum length and width of the Mega PCB are 4 and 2.1 inches
> respectively, with the USB connector and power jack extending beyond
> the former dimension. Three 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.
>
> The Mega is designed to be compatible with most shields designed for
> the Diecimila or Duemilanove. Digital pins 0 to 13 (and the adjacent
> AREF and GND pins), analog inputs 0 to 5, the power header, and ICSP
> header are all in equivalent locations. Further the main UART (serial
> port) is located on the same pins (0 and 1), as are external
> interrupts 0 and 1 (pins 2 and 3 respectively). SPI is available
> through the ICSP header on both the Mega and Duemilanove / Diecimila.
> Please note that I2C is not located on the same pins on the Mega (20
> and 21) as the Duemilanove / Diecimila (analog inputs 4 and 5).
>
>
>
>
> Images
> Some images contain optional accessories and components.
>
> Related items
> Arduino Duemilanove
> Price: $29.45
>
>
> Seeeduino fully Assembled - Arduino compatible
> Price: $23.99
>
>
>
>
> ---- SWARM, A Large Scale Kinetic Art Project
> ---- http://orbswarm.com
> http://lists.lee.org/listinfo.cgi/swarm-lee.org
>
>
>
>
> --
> I refuse to give up childish things.
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