[Noisebridge-discuss] Fwd: [Swarm] Arduino Mega spotted in the wild!
Christie Dudley
longobord at gmail.com
Mon Mar 30 22:33:14 UTC 2009
Sorry, this is not a workshop, this is a bulk order. You're on your own as
to what to do with it. If you want one, please feel free to sign up. If
you need handholding, look elsewhere.
Christie
2009/3/30 William Heath <wgheath at gmail.com>
> I am not a beginner but ok. I have a CSE and MSCS. I have programmed
> motorola 68K's, eproms, etc... I can do truth tables and map out the gates
> necessary to realize those inputs/outputs in my sleep.
> -Tim
>
> P.S.
>
> Just need a small refresher. Ask me hardware questions if you want to
> verify my knowledge. I had the highest grade in my microprocessors class in
> college as well.
>
> 2009/3/30 Christie Dudley <longobord at gmail.com>
>
> 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.
>>
>> _______________________________________________
>> 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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