[Noisebridge-discuss] Fwd: [Swarm] Arduino Mega spotted in the wild!
Christie Dudley
longobord at gmail.com
Mon Mar 30 22:12:28 UTC 2009
This probably isn't a good board for a beginner to start with. The "Mega"
version has a lot more complexity than you'd use if you're not already
familiar with the arduino, I'd suggest you start there. A tutorial on that
can be found on the arduino website at:
http://arduino.cc/en/Tutorial/HomePage
Christie
On Mon, Mar 30, 2009 at 3:08 PM, jim <jim at well.com> wrote:
>
> 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.
> > _______________________________________________
> > Noisebridge-discuss mailing list
> > Noisebridge-discuss at lists.noisebridge.net
> > https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>
>
--
I refuse to give up childish things.
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