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BÁN LINH KIỆN ĐIỆN TỬ Bo PHÁT TRIỂN arduino yún chính hãng 100% luôn nhé

ID tin: 4206890
Cập nhật: 19/08/2016, lúc 16:09 -

Linh kiện, Phụ kiện ĐT


Bo phát triển Arduino Yún


  • Bo phát triển Arduino Yún

  • Xuất xứ:Arduino - Taiwan

  • Giá:1.990.000 đ

  • Tình trạng:Hàng có sẵn

  • Lượt xem:2275





    • Bo phát triển Arduino Yún
    Overview
    The Arduino Yún is a microcontroller board based on theATmega32u4(datasheet) and the AtherosAR9331. The Atheros processor supports a Linux distribution based onOpenWrtnamedOpenWrt-Yun. The board has built-in Ethernet andWiFisupport, a USB-A port, micro-SD card slot, 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16MHzcrystal oscillator, a micro USB connection, an ICSP header, and a 3 reset buttons.

    NB : In some countries, it is prohibited to sellWiFienabled devices without government approval. While waiting for proper certification, some local distributors are disablingWiFifunctionality. Check with your dealer before purchasing a Yún if you believe you may live in such a country.If you wish to disableWiFi, runthis sketch. For more information, refer tothis forum post.


    The Yún distinguishes itself from other Arduino boards in that it can communicate with the Linux distribution onboard, offering a powerful networked computer with the ease of Arduino. In addition to Linux commands like cURL, you can write your own shell and python scripts for robust interactions.

    The Yún is similar to the Leonardo in that theATmega32u4has built-in USB communication, eliminating the need for a secondary processor. This allows the Yún to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.


    The Bridge library facilitates communication between the two processors, giving Arduino sketches the ability to run shell scripts, communicate with network interfaces, and receive information from theAR9331processor. The USB host, network interfaces and SD card are not connected to the 32U4, but theAR9331, and the Bridge library also enables the Arduino to interface with those peripherals.

    Summary
    Because the Yún has two processors, the summary section shows the characteristics of each one in two separate tables.

    AVR Arduino microcontrollerMicrocontrollerATmega32u4Operating Voltage5VInput Voltage5VDigital I/O Pins20PWM Channels7Analog Input Channels12DC Current per I/O Pin40 mADC Current for 3.3V Pin50 mAFlash Memory32 KB (of which 4 KB used by bootloader)SRAM2.5 KBEEPROM1 KBClock Speed16MHzLinux microprocessorProcessorAtherosAR9331ArchitectureMIPS @400MHzOperating Voltage3.3VEthernetIEEE 802.3 10/100Mbit/sWiFiIEEE 802.11b/g/nUSB Type-A2.0 HostCard ReaderMicro-SD onlyRAM64 MBDDR2Flash Memory16 MBPoEcompatible 802.3af card support (see the note below)
    Schematic & Reference Design
    Schematic:arduino-Yun-schematic.pdf,arduino-Yun-DSN.zip

    Power
    It is recommended to power the board via the micro-USB connection with 5VDC.

    If you are powering the board though the Vin pin, you must supply a regulated 5VDC. There is no on-board voltage regulator for higher voltages, which will damage the board.

    The Yún is also compatible withPoEpower supply but in order to use this feature you need to mount aPoEmodule on the board or buy a preassembled board.

    Note : early models of the Yún with aPoEadapter were incorrectly providing the board with 12V. An updated version will soon be provided to distributors that provide the expected 5V. If you believe you have the wrongPoEadapter on your board, please contact support@arduino.cc

    The power pins are as follows:


    • VIN.The input voltage to the Arduino board.Unlike other Arduino boards, if you are going to provide power to the board through this pin, you must provide a regulated 5V.

    • 5V.The power supply used to power the microcontrollers and other components on the board. This can come either from VIN or be supplied by USB.

    • 3V3.A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.

    • GND.Ground pins.

    • IOREF.The voltage at which the i/o pins of the board are operating (i.e. VCC for the board). This is 5V on the Yún.


    Memory
    TheATmega32u4has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with theEEPROM library).

    The memory on theAR9331is not embedded inside the processor. The RAM and the storage memory are externally connected. The Yún has 64 MB ofDDR2RAM and 16 MB of flash memory. The flash memory is preloaded in factory with a Linux distribution based onOpenWrtcalledOpenWrt-Yun. You can change the content of the factory image, such as when you install a program or when you change a configuration file. You can return to the factory configuration by pressing the "WLAN RST" button for 30 seconds.

    TheOpenWrt-Yun installation occupies around 9 MB of the 16 MB available of the internal flash memory. You can use a micro SD card if you need more disk space for installing applications. Follow the procedure described in this tutorial:How to expand the Yún disk space.

    Input and Output
    It is not possible to access the I/O pins of the AtherosAR9331. All I/O lines are tied to the 32U4.

    Each of the 20 digital i/o pins on the Yún can be used as an input or output, usingpinMode(),digitalWrite(), anddigitalRead()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).Used to receive (RX) and transmit (TX) TTL serial data using theATmega32U4hardware serial capability. Note that on the Yún, theSerialclass refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use theSerial1class. The hardware serials of theATmega32U4and theAR9331on the Yún are connected together and are used to communicate between the two processors. As is common in Linux systems, on the serial port of theAR9331is exposed the console for access to the system, this means that you can access to the programs and tools offered by Linux from your sketch.

    • TWI: 2 (SDA) and 3 (SCL).Support TWI communication using theWire library.

    • External Interrupts: 3 (interrupt 0), 2 (interrupt 1), 0 (interrupt 2), 1 (interrupt 3) and 7 (interrupt 4).These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See theattachInterrupt()function for details. Is not recommended to use pins 0 and 1 as interrupts because they are the also the hardware serial port used to talk with the Linux processor. Pin 7 is connected to theAR9331processor and it may be used as handshake signal in future. Is recommended to be careful of possible conflicts if you intend to use it as interrupt.

    • PWM: 3, 5, 6, 9, 10, 11, and 13.Provide 8-bit PWM output with theanalogWrite()function.

    • SPI: on the ICSP header.These pins support SPI communication using theSPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Yún's 6-pin ICSP header, the shield will not work.


    The SPI pins are also connected to theAR9331gpio pins, where it has been implemented in software the SPI interface. This means that theATMega32u4and theAR9331can also communicate using the SPI protocol.


    • 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.

    • There are several other statusLEDson the Yún, indicating power, WLAN connection, WAN connection and USB.




    • Analog Inputs: A0 - A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12).The Yún has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and theanalogReference() function.

    • AREF.Reference voltage for the analog inputs. Used withanalogReference().


    There are 3 reset buttons with different functions on the board:



    • Yún RST.Bring this line LOW to reset theAR9331microprocessor. Resetting theAR9331will cause the reboot of the linux system. All the data stored in RAM will be lost and all the programs that are running will be terminated.

    • 32U4 RST.Bring this line LOW to reset theATmega32U4microcontroller. Typically used to add a reset button to shields which block the one on the board.

    • WLAN RST.This button has a double feature. Primarly serves torestore theWiFito the factory configuration. The factory configuration consist to put theWiFiof the Yún in access point mode (AP) and assign to it the default IP address that is 192.168.240.1, in this condition you can connect with your computer to the aWiFinetwork that appear with the SSID name "Arduino Yun-XXXXXXXXXXXX", where the twelve 'X' are the MAC address of your Yún. Once connected you can reach the web panel of the Yún with a browser at the 192.168.240.1 or "http://arduino.local" address. Note that restoring theWiFiconfiguration will cause the reboot of the linux environment. To restore yourWiFiconfiguration you have to press and hold the WLAN RST button for 5 seconds. When you press the button the WLAN blue LED will start to blink and will keep still blinking when you release the button after 5 seconds indicating that theWiFirestore procedure has been recorded. The second function of the WLAN RST button is torestore the linux imageto the default factory image. To restore the linux environment you must press the button for 30 seconds. Note that restoring the factory image make you lose all the files saved and softwares installed on the on-board flash memory connected to theAR9331.


    See also themapping between Arduino pins and ATmega32u4 ports.

    Communication
    The Yún has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. TheATmega32U4provides a dedicated UART TTL (5V) serial communication. The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TXLEDson the board will flash when data is being transmitted via the USB connection to the computer.

    Digital pins 0 and 1 are used for serial communication between the 32U4 and theAR9331. Communication between the processors is handled by theBridge library.

    ASoftwareSerial libraryallows for serial communication on any of the Yún's digital pins except for pins 0 and 1.

    TheATmega32U4also supportsI2C(TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of theI2Cbus; see thedocumentationfor details. For SPI communication, use theSPI library.

    The Yún appears as a generic keyboard and mouse, and can be programmed to control these input devices using theKeyboard and Mouseclasses.

    The onboard Ethernet andWiFiinterfaces are exposed directly to theAR9331processor. To send and receive data through them, use theBridge library. To configure the interfaces, you can access the network control panel as described in thegetting started page.

    The Yún also has USB host capabilities throughOpenWrt-Yun. You can connect peripherals like USB flash devices for additional storage, keyboards, or webcams. You may need to download and install additional software for these devices to work. For information on adding software to theAR9331, refer to the notes onusing the package manager.

    Programming
    The Yún can be programmed with the Arduino software (download). Select "Arduino Yún from theTools > Boardmenu (according to the microcontroller on your board). For details, see thereferenceandtutorials.

    TheATmega32U4on the Arduino Yún comes preburned with abootloaderthat allows you to upload new code to it without the use of an external hardware programmer. It communicates using theAVR109protocol.

    You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; seethese instructionsfor details.

    Automatic (Software) Reset and Bootloader Initiation
    Rather than requiring a physical press of the reset button before an upload, the Yún is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Yún's virtual (CDC) serial / COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial / COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Yún. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader.

    Because of the way the Yún handles reset it's best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can't reset the board you can always start the bootloader by pressing the reset button on the board.

    USB Overcurrent Protection
    The Yún 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
    The maximum length and width of the Yún PCB are 2.7 and 2.1 inches respectively, with the USB connector extending beyond the former dimension. Four 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.

    Weight of the board is 0.0406 Kg.

    Using your Yun
    There is an extensiveGetting Started Guideand a number of tutorials found on thelibrary reference page.


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