[Noisebridge-discuss] Re: [Swarm] Arduino Mega spotted in the wild!

Mon Mar 30 23:11:02 UTC 2009

Please, everyone sign up on the Noisebridge wiki.  I'm getting mail on this
from 2 lists and I can't tell which of you is serious and which is only
joking around.  I can't tell who is included in my list and who gets counted
twice, etc.

The sign up page is:
https://www.noisebridge.net/wiki/Mega_Arduino_Order

These guys are $65 if ordered singly.  I'm hoping to get them down a bit to
$58.50, as well as increase the critical mass of friends that have them so
there are plenty of brains to pick.  I'd like to get the order out as soon
as Thursday, but will hold off a day or two if it seems getting critical
mass is immanent.

Christie

2009/3/30 Lee Sonko <lee at lee.org>
>
>>  Young man,
>> Do you really need so much power in a microcontroller?
>>
>> Pretty soon we'll see you rolling down in the Mission with a road rumbler
>> stereo in your car's trunk!
>>
>> Have you gotten that I2C LED controller working yet? Inquiring Vivoliths
>> want to know!
>>
>>
>>
>>  ------------------------------
>>  *From:* swarm-bounces at lee.org [mailto:swarm-bounces at lee.org] *On Behalf
>> Of *Corey McGuire
>> *Sent:* Monday, March 30, 2009 2:20 PM
>> *To:* Swarm
>> *Subject:* [Swarm] Arduino Mega spotted in the wild!
>>
>>   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 <http://www.atmel.com/dyn/resources/prod_documents/doc2549.pdf>).
>> 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 MHzcrystal 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<http://arduino.cc/en/Main/ArduinoBoardMega?action=upload&upname=arduino-mega-reference-design.zip>
>>  Δ<http://arduino.cc/en/Main/ArduinoBoardMega?action=upload&upname=arduino-mega-reference-design.zip>
>>
>> Schematic: arduino-mega-schematic.pdf<http://arduino.cc/en/uploads/Main/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<http://www.arduino.cc/en/Reference/EEPROM>).
>>
>> Input and Output
>>
>> Each of the 54 digital pins on the Mega can be used as an input or output,
>> using pinMode() <http://arduino.cc/en/Reference/PinMode>, digitalWrite()<http://arduino.cc/en/Reference/DigitalWrite>,
>> and digitalRead() <http://arduino.cc/en/Reference/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() <http://arduino.cc/en/Reference/AttachInterrupt>function for details.
>>    - *PWM: 0 to 13.* Provide 8-bit PWM output with the analogWrite()<http://arduino.cc/en/Reference/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<http://wiring.org.co/reference/libraries/Wire/index.html>(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 <http://arduino.cc/en/Reference/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 ATmega1280provides four hardware
>> UARTs for TTL (5V) serial communication. An FTDI FT232RL on the board
>> channels one of these over USB and the FTDI drivers<http://www.ftdichip.com/Drivers/VCP.htm>(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<http://www.arduino.cc/en/Reference/SoftwareSerial>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<http://wiring.org.co/reference/libraries/Wire/index.html>for details. To use the SPI communication, please see the
>> ATmega1280 datasheet.
>>
>> Programming
>>
>> The Arduino Mega can be programmed with the Arduino software (download<http://arduino.cc/en/Main/Software>).
>> For details, see the reference <http://arduino.cc/en/Reference/HomePage>and
>> tutorials <http://arduino.cc/en/Tutorial/HomePage>.
>>
>> The ATmega1280 on the Arduino Mega comes preburned with a bootloader<http://arduino.cc/en/Tutorial/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 <http://www.atmel.com/dyn/resources/prod_documents/doc2525.pdf>,
>> C header files<http://www.atmel.com/dyn/resources/prod_documents/avr061.zip>
>> ).
>>
>> You can also bypass the bootloader and program the microcontroller through
>> the ICSP (In-Circuit Serial Programming) header; see these instructions<http://arduino.cc/en/Hacking/Programmer>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 <http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1213719666/all>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 <http://www.nkcelectronics.com/arduino-diecimila.html> Arduino
>> Duemilanove <http://www.nkcelectronics.com/arduino-diecimila.html>
>>
>> Price: $29.45
>>
>> <http://www.nkcelectronics.com/seeeduino-fully-assembled--arduino-compatible.html> Seeeduino
>> fully Assembled - Arduino compatible<http://www.nkcelectronics.com/seeeduino-fully-assembled--arduino-compatible.html>
>>
>> Price: $23.99
>>
>>
>
>
> --
> Success is a tasty spirit distilled from bitter failure
> --Coreyfro
>
> ---- 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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