Paja

I am experimenting N9 and Arduino. Since QML on N9 doesn’t support any serial communication over USB, I am using the serial communication over Bluetooth.

This post describes how you control a servo motor with N9 over Bluetooth.

Tools

• N9
• Xcode (Tools developed by Apple for developing software for Mac OSX and iOS)
• Qt SDK (Qt Creator)
• Arduino
• Bluetooth module (BlueSMiRF Gold from Sparkfun)
• Breadboard
• Jumper wires
• Servo motor (Regular servo, Continuous Servo)

Personal Fabrication

• Open source software
  • Arduino (Microcontroller for non programmers)
  • Processing (Program language for non programmers)
  • Fritzing (Non engineer to design electric circuits)
  • Blender (Open source 3D modeling software)
  • Open NI (Hacking Kinect 3D camera): demos
• Hacker community
  • Make magazine
  • Hacker spaces in the world
  • Fab lab (Neil Gershenfeld in TED): CNC, 3D printer etc.
• Cost and materials
  • MakerBot, RapMan, Up! and SUMPOD (CNC and 3D printers under $1000)
  • Sparkfunand distributers all over the world (Ready made electronic components such as sensors)
    • Finnish stores: Månsteri, Paeae and Robomaa
  • Thingiverse (digital data for 3D objects)
  • Pachube (Real time sensor data on the earth)
• It is time to make and tinker things by ourselves at home
  • IndieGoGo (online crowdfunding platform)
  • Kickstarter (online crowdfunding platform)

Setting up environment

• Install Xcode (4GB).
• Install Qt SDK (1.2GB).
• Activate developer mode on N9 (Settings > Security > Developer mode). This may take some time to complete.
• Settings on Qt Creator
  • • Go to File > Preference
    • Click Linux devices section
    • Click “Add” to select Device with MADDE support
    • Give a name to the name to identiy this configuration. e.g MyN9
    • Press “No” in the next dialog. They ask if you have a pass word already.
    • Check Create key and press continue
    • Click Create key in the next dialog and press continue
  • N9
    • Connect N9 and your PC with USB and select SDK mode if dialog appears
  • Mac OSX
    • You will be asked to open Network window in System Preference on your PC and press apply to add the N9
  • N9
    • Launch SDK connection app and select USB on the N9
    • You can find password on your screen
  • Qt Creator
    • Go back to Qt Creator preference
    • Type the password into the dialog on Qt Creator preference and press deploy key
    • Select “MeeGo 1.2 Harmattan” in configuration pull down menu
  • • Select Key in Authorization type. Your PC will remember password that SDK connection app on N9
    • Close all preference windows on the Qt Creator
• Install Arduino Software
• Install USB driver (it should be in the Arduino Software installation package)

First QML application on N9

• Create a project (File > New file or project)
• Select Qt Quick Application in Qt Quick project section
• Give a name to the project and press continue
• Select Qt Quick Components for Meego/Harmattan and select continue
• Select only Harmattan for the target setup and select continue
• You can choose your own app icon and press continue
• Keep version control as none and press done
• Qt Creator generates files and press yes in the dialog
• Run the code (Build > Run)
• N9 launches your Hello World application after while

Understanding electronics (pdf)

• Tools: Arduino, Breadboard, Jumper wires and Multimeter
• Understanding schematics
• Flow of positive charge
• Assembling electronics

First Arduino project

• Connect Arduino to the PC using USB cable
• Open this PDE file with Arduino Software
• Select a right Arduino board: Arduino Duemilanove or Nano w/ ATmega328 (Arduino software > Tools > Board)
• Select a right serial port: /dev/tty/usb****** (Arduino Software > Tools > Serial Port)
• Upload the PDE file to Arduino (Arduino Software > File > Upload to I/O board)
• The software shows “Done uploading”.
• The LED should be flashing.
• You can modify number in the following line.

• delay(1000);

• Upload the code once more to see the result in action.

Control motor from N9 over Bluetooth

Note: N9 should also support USB connection using QML. Android has already a good support on this: Android Open Accessory Development Kit

• Arduino Software
  • Assemble electronics (pdf)
  • Upload PDE file to Arduino
• N9
  • Launch SDK connection and select USB
  • Turn Bluetooth on (N9 > Setting application > Bluetooth)
• Qt Creator
  • Replace MainPage.qml with this code in the previous QML application project. The file is located under the following file name. (Project name) > QML > qml/(project name)
  • In the MainPage.qml, put the physical address of your Bluetooth module as follows. It is written on your Bluetooth module (e.g. 00066602d4cd)
• property String btAddress: “00:06:66:02:d4:cd”
• • Run the code (Build > Run)
• N9
  • N9 will launch your application
  • Make sure Bluetooth is activated in Setting application
  • Switch on your application
  • Rotate the N9 device
• Servo motor
  • The servo motor will rotate as you turn the device!