Arduino Yun

Crash Course

• if you don't know the yun password ask someone that would know in person
  • all of the cs yuns use the same password
• getting started http://arduino.cc/en/Guide/ArduinoYun
• Arduino IDE 1.5.8 BETA must be used, get it here: http://arduino.cc/en/Main/Software
• micro usb port is used for power and for uploading sketches
• IP address can be used in a web browser or to ssh
• SD cards and flash drives are automatically mounted to /mnt/
• OS is OpenWrit and uses OPKG (similar to apt-get) http://arduino.cc/en/Tutorial/YunPackageManager
• has Python 2.7
• advised that C++ be cross-compiled
  • GCC exists in version 1.5+
• the "Bridge" library creates a bridge between Arduino and Linux
  • read this for more information: http://arduino.cc/en/Reference/YunBridgeLibrary
  • or this for an example: http://arduino.cc/en/Tutorial/Bridge
• example Web pages can be added to /www/ and accessed normally
• source REST has a built-in interface for pins under /data
• source Pins 21, 22, and 23 can be accessed in /sys/class/gpio/ (in linux)
• example LuCI web interface can be hacked somehow (magic?)

each Yun

• is numbered
• has a designated box
• has a label on it with its number and the last two octets of its IP address (I.E. cs4 130.63 is csyun4 with the IP 159.28.130.63)
  • 159.28 is Earlham's IP address

Resources

product page

getting started

need sorting ->

• http://arduino.cc/en/Tutorial/YunDatalogger
• https://www.temboo.com/arduino/yun/

Current Yuns

csyun1

• registered
• configured
• 90A2DAF510F8
• ec2011
• 159.28.130.243
• owner: charliep
• OpenWRT v1.0

csyun2

• registered? (no internet access)
• configured?
• 90A2DAF30034
• ec2009
• 159.28.130.242
• owner: charliep
• OpenWRT v1.0

csyun3

• registered
• configured
• 90A2DAF210E7
• ec2012
• 159.28.130.191
• owner: charliep
• OpenWRT v1.0

csyun4

• ARC yun
• registered
• configured
• 90A2DAF031AC
• ec2016
• 159.28.130.63
• owner: charliep
• OpenWRT v1.0

csyun5

• registered
• configured
• 90A2DAF9035F
• ec2017
• 159.28.131.13
• owner: charliep
• OpenWRT v1.0

csyun6

• registered
• configured
• 90A2DAF51147
• ec2024
• 159.28.131.16
• owner: charliep
• OpenWRT v1.0

csyun7

• ARC yun
• registered
• configured
• 90A2DAF30459
• 159.28.131.46
• owner: charliep
• OpenWRT v1.0

Details

Package Manager

Uses a package manager called opkg. Very similar to apt-get and yum. Has a healthy selection of software.

Comes preinstalled with

• python 2.7
• node.js
• vim / nano

Boot

• The Arduino side boots up almost instantaneously.
• However, the Linux side takes about as long as a normal PC to boot up.
• The white light seems to indicate that the wifi is working as well as other things.

Sketch Upload

• You can't upload sketches through wifi on ECWireless. It works on normal LANs. (Why?)
• It's normal for the USB to lose connection and to immediately reestablish connection. The Arduino programmable USB seems to be piggybacking on linux as a virtual COM port.
  • Sometimes the recognized COM port will change after the first sketch upload. It seems this is due to the linux side swapping to the correct Arduino COM port.
  • If the connection is not reestablished (why?) you can use the "USB stops being recognized" bit below.

Serial

• Serial talks via the Arduino serial monitor
• Bridge establishes communication between Arduino and Linux processors
• Console uses bridge to establish a console (similar to serial) that can be accessed with telent from the Yun's local terminal

troubleshooting

Network

I had trouble getting it on ECWireless.

• I went to go to ITS and had them register the Yuns manually. ITS has registered our Yuns' as "college owned" so that they don't require authentication.
• In the Yun web configuration panel I set them to connect to ECWireless and then was able to ssh to them directly.
• However, I could not upload sketches via wifi. This is due to the configuration of ECWireless.

It's possible to get a Yun's IP by uploading a ShellCommand sketch and running the "ifconfig" command.

• very useful when on a non-static IP network
• For example, this could be used to get a Yun's IP address when it's on Guest Wireless.

USB stops being recognized

This fixed my problem: arduino form

1. nano /usr/bin/run-avrdude
2. Change the efuse value from FB to CB
3. execute "/usr/bin/run-avrdude /etc/arduino/Caterina-Yun.hex"

Temboo

Arduino Description of Temboo

Temboo Getting Started