[Noisebridge-discuss] Fwd: [Swarm] Arduino Mega spotted in the wild!
William Heath
wgheath at gmail.com
Mon Mar 30 22:19:55 UTC 2009
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.
>
> _______________________________________________
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> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
>
>
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