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Arduino YUN mini
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Arduino Yun Mini is a breadboard PCB developed with ATmega 32u4 MCU and QCA MIPS 24K SoC CPU operating up to 400 MHz. Qualcomm Atheros CPU supports a Linux distribution based on OpenWRT named Linino. The board has built- in WiFi ( IEEE 802.11b/g/n operations up to 150Mbps 1x1 2.4 GHz ) supports 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connector, an ICSP header, two reset buttons and one user button.
The Arduino Yún Mini is similar to the Leonardo in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Arduino Yún Mini 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 the AR9331 processor. The USB host, network interfaces and SD card are not connected to the 32U4, but the AR9331, and the Bridge library also enables the Arduino to interface with those peripherals.
Summary
AVR Microcontroller |
|
Microcontroller | ATmega32u4 |
Operating Voltage | 5V |
Input Voltage | 5V |
Digital I/O Pins | 20 |
PWM Channels | 7 |
Analog input channels | 12 |
DC Current per I/O Pin | 40 mA |
DC Current for 3.3V Pin | 50 mA |
Flash Memory | 32 KB |
SRAM | 2.5 KB |
EEPROM | 1 KB |
Clock Speed | 16 MHz |
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Linux Processor |
|
Processor | Atheros AR9331, MIPS 24K processor operating at up to 400 MHZ |
WiFi | IEEE 802.11b/g/n |
RAM | 64 MB DDR2 |
Flash Memory | 16 MB |
Operating Voltage | 3.3 V typ.380mA (113~570 mA) |
Input Voltage | 4.75~5.25 V/1A |
Temperature | Operating: 0º~60º C |
| Storage: -10º~60º C |
Schematic & Reference Design
Add ons
The Arduino Yun Mini can be complemented by three accessories: the dogRJ45, the dogUSB and the dog eMMC.
The first is an Ethernet port that can be added to the Arduino YUN Mini if one needs this type of port for their specific project.
The second one, dogUSB, is a USB port featuring also a slot for a mini SD to extend the memory of the board.
The last one, which is dogUSB eMMC, is really the latest novelty in terms of accessories: it’s a USB port with an integrated 4 Giga of Flash.
The user can add either a single accessory or two, according to their needs.
dogRJ45 | IEEE 802.3 fast ethernet switch |
| 10/100 Mbps fast ethernet port |
dogUSB | USB A type connector with USB 2.0 hub |
| Micro SD connector with card reader |
dog eMMC | 4 GB Flash |
| USB port type A |
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 power pins are as follows:
Memory
The ATmega32u4 has 32 KB (with 4 KB used for the boot loader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).
The memory on the AR9331 is not embedded inside the processor. The RAM and the storage memory are externally connected. The Yún Mini has 64 MB of DDR2 RAM and 16 MB of flash memory. The flash memory is preloaded in factory with a Linux distribution based on OpenWrt called Linino OS. 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.
The Linino OS installation occupies around 6 MB of the 16 MB available of the internal flash memory. You can use dogUSB with a micro SD card or dog eMMC a 4GB Flash if you need more disk space for installing applications.
Input and Output
Now it is possible to access the I/O pins of the Atheros AR9331 together with the I/O pins of the AVR 32u4.
Atheros AR9331 pins:
Each of these pins can be used by LininoOS side as peripherals of Linux Kernel.
In addition, some pins have specialized functions:
AVR 32u4 pins:
Each of the 20 digital i/o pins on the Yún Mini can be used as an input or output, using the 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:
There are 3 reset buttons with different functions on the board:
CORZOTECH - EASY LIFE FOR INTERACTION