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Deep knowledge of Arduino Tian

Differences from the Arduino YUN

The Arduino Tian is a new board that it has, as Arduino Yun, a WiFi module and a MIPS Linux.

The main differences between the two boards are here summarized:
- The Tian use the ARM Microcontroller SAMD21G18 (Operating voltage 3.3V, SRAM 32KB and Flash memory 256KB) while the Yun use the AVR Microcontroller ATmega 32u4 (Operating voltage 5, SRAM 2.5KB and Flash memory 32KB).
- Also the MIPS are different. The Tian mounts the Atheros AR9342 to 560 MHz while the Yun uses the Atheros AR9331 to 400 MHz.
- Other differences are that the Tian board has Bluethoot 4.0 technology and it has 4GB eMMC memory.

- Also the Wifi module is different. The Arduino Tian has IEEE802.11n 2x2 2.4/5 GHz dualband.

So as the Arduino Yun also Tian has three reset buttons one for microcontroller, one for WiFi, and one for MIPS processor.

There are eight status LEDs on the Tian that indicate:TX UART SAMD21, RX UART SAMD21, POWER, WLAN, USB, LED ACT, LED 10/100 and LED 13, as shown in the picture. 

 

OpenWrt LininoOS

LininoOS is based on OpenWRT distribution with about 3000 package built and available. LininoOS provides a fully writable filesystem with package management with GPG signature. Integrated with LininoIO it is a complete linux system for IoT space.
LininoOS features many innovations for your Arduino Tian.

  • LininoIO is a software framework able to integrate microcontroller features inside the microprocessor environment. You can simply write your application using Node.js, Python, Bash, etc., on linux side using LininoOS to control completely the board and all the devices attacched.

 

  • Node.js with Ideino Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. Ideino is an embedded editor to write and debug your node.js application.

 

  • All Joyn supported, which is an open source project which provides a universal software framework and core set of system services that enable interoperability among connected products and software applications to create dynamic proximal networks.

 

Python

An installation of Python 2.7 is included with LininoOS, which you can use to write applications or scripts.
For more on Python, visit the Python 2.7 documentation pages .

Install additional software on Linux

The Tian comes with several pieces of software pre-installed on LininoOS, including "curl" and "python". You may want to install other software on the Tian. On Linux systems, additional software can be installed using a tool called the "opkg".
You can find pre-compiled packages for LininoOS on their latest version, here .

Resetting the processors (AR9342, WiFi, and SAMD21)

To restart the AR9342, which reboots LininoOS, press the "AR9342 Reset" button.
To restart the SAMD21 and restart the currently installed Arduino sketch, tap the button "SAMD21 Reset" one times.
To reset Wifi there is a button and when you press the "WiFi Reset" button, the WLAN LED will flash.


If you move to a different network and can no longer wirelessly access the Tian through its web interface, you can reset the Tian's network configuration by pressing the WiFi reset button (WLAN RST) for longer longer than 5 seconds, but less than 30, the AR9331 processor will reboot. The WiFi configuration will be reset and the Industrial 101 will start its own WiFi network Linino-XXXXXXXXXXXX. Any other modification/configuration will be retained.

To reset the LininoOS distribution to its default state, press the WiFi reset button (WLAN RST) for at least 30 seconds. The board reverts to the original settings: like just taken out of the box or to the latest update of the LininoOS image you have reflashed before. Among other things, this removes all installed files and network settings.

Resetting the password

The webpanel password can be reset and changed. Connect the Arduino Tian to your computer with an USB cable and upload the SerialTerminal sketch. It can be found in the Bridge examples in the Arduino IDE. When the Industrial 101 boot is completed, open the serial monitor, select New Line character in the dropdown menu and press Enter. Something like this should appear in your serial monitor:


Now you have to execute the passwd command to change the password. Type passwd into the serial monitor input and press enter. You will be asked to type the new password, and re-type it to confirm. If you want, you can ignore the weak password error. If both passwords you typed match, the system password will be changed and you will be able to access to the webpanel with the new password.

Serial re-enumeration on reset.

Since the Tian does not have a dedicated chip to handle serial communication, it means that the serial port is virtual — it's a software routine, both on your operating system, and on the board itself. Just as your computer creates an instance of the serial port driver when you plug in any Arduino, the SAMD21 creates a serial instance whenever it runs its bootloader. The board is an instance of USB's Connected Device Class (CDC) driver.
This means that every time you reset the SAMD21 processor, the USB serial connection will be broken and re-established. The board will disappear from the list of serial ports, and the list will re-enumerate. Any program that has an open serial connection to the Tian will lose its connection. This is in contrast to the Arduino Uno, with which you can reset the main processor (the ATmega328P) without closing the USB connection (which is maintained by the secondary ATmega8U2 or ATmega16U2 processor). This difference has implications for driver installation, uploading, and communication.

No reset when you open the serial port.

The Tian won't restart your sketch when you open a serial port on the computer. That means you won't see serial data that's already been sent to the computer by the board, including, for example, most data sent in setup().
This also applies to the Console, described below.

This means that if you're using any Serial or Console print(), println() or write() statements in setup(), they won't show up when you open the serial monitor or Console connection. To work around this, you can check to see if the port is open like so:

//stops the program until Serial Monitor is opened
   while (!Serial) ;

or

// stops the program until Console is opened
   while (!Console) ;

 

Configuring the on board WiFi

Programming the SAMD21 over WiFi
If you Tian is in your computer's same network, you can upload a sketch using the Wireless Connection.
After configuring your board, connect it to the network that you have specified in the configuration settings. Open the Arduino IDE.
Under the Tools > Port menu, you should see an entry that lists your Tian's name and its IP address. Under the Board menu, select Arduino Tian.
Open the Blink example (File > Examples > 01Basics > Blink) and upload the sketch to the board. You will be prompted for the administrator password. Use the one you entered in the configuration screen.
Once the program is uploaded, the SAMD21 processor will restart. You should see the LED connected to pin 13 blinking.
Using the onboard Ethernet (via dogEthernet)
When you connect the Tian to a wired network with an ethernet cable, it will try to connect automatically via DHCP. The board will show up on the ports menu just as it would over WiFi.
If you want to connect the Industrial101 directly to your computer, either configure the computer's interfaces to have a static IP address, or act as a DHCP server.

NB: the ethernet interface is eth1, not eth0