Category Archives: Mobile

OBWIous – Opensource Bluetooth Watch Initiative

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Hi everybody,
Lately i’ve been spending my spare times to build an homemade bluetooth wristwatch.I’ve used Nokia 6610 LCD for display, Bluesmirf GOLD for the bluetooth and Arduino Mini Pro for the processing.
I just finished most of the soldering & electronics part yesterday… Only one thing left on the electronics part and that is adding some buttons onto the watch.
I’ve written a bluetooth client application for N900(Maemo5). But it still needs some improvement on User Interface. So to speak back-end for N900 is done..
Today i made a simple Graphical User Interface for the watch and i recorded a video to introduce User Interface.


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N900 Interaction with Arduino Mini Pro via Bluesmirf GOLD

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I just got my Arduino Mini Pro & Bluesmirf GOLD yesterday. Im running some tests and practicing some stuff with them. Since yesterday , my personal achievements are “Using Arduino as an ISP Programmer” , “Communication through bluetooth with Bluesmirf”.

I used an old arduino of mine – which is a so called Arduino Severino – to program Arduino Mini Pro.I had a RS232 to USB converter so i could program it with my laptop. But the uploading process was quite tricky. Im going to write down the tips and tricks here in case i forgot , i dont want to struggle with whole that all over again.

Make sure baudrate is 19200
Switch Arduino Severino to Serial Enable Mode( Move (JP0)Serial Female header to 2-3 pins ).
Click upload button and wait for the “sketch size bla bla” notification appear below , when it appears press reset button asap…

Communication through Bluesmirf is no different than Serial Comm. But make sure you connect Tx-Rx pins reverse. Tx(bluesmirf)->Rx(arduino)……

And here are some photos and a video demo. of what i have done so far…
More Photos

Gravitan – Entertainment App. for Android

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Hi my fellow readers,

I’ve been studying on android application development last week.As i was familiar with OpenGL and it’s port for Embedded Systems which is GLES ,i choosed to study on that part first.
I’m planning to make 2D Slingshot based game for Android.So i made a simple demo. to implement main, fundemental structure of the software that is going to be required to build-up a Slingshot game.

How it works:
You can add new circular masses by dragging white circle below the blue line.
As you drag, There you will see a white line appearing , which signifies the launch speed of the mass that will be created as you stop tapping.
I named it Gravitan but it’s simply the predecessor of the upcoming slingshot game. :) here are some screenshots :)

Download

Please report any bug you discover :)

Self-Balancing Robot First Step:The Interaction

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Here is the first step in making of Self Balancing Robot. In this step i worked on Bluetooth & Serial Communication.
Communication scheme:
N95 —(Bluetooth)—> PC —–( Serial)—-> Arduino
I used the same motor driver shield which i already made back in Narduino Project.
If you havent heard about Narduino Shield and its simple design done on veroboard click here to see it and its circuit diagram.
After the Narduino shield properly connected to motor wires and the supply connection ,  it is time to talk about coding…
Here below , i shared all the codes used in the project.
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Self-Balancing robot project starts!

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I just had an idea yesterday that can get me to make a self-balancing robot without buying any expensive electronic components.
You know last summer i made a cellphone controlled RC Car which had a tabletpc onboard to get commands via bluetooth.That time , having an onboard tabletpc , save me from buying a bluetooth chip which costs about 60$.This time, to make a self-balancing robot i’ll have to have whether an Accelerometer or a MEMS Gyro to track rotation of the robot.
Those sensors are pretty expensive too.So i’m thinkin about putting my n95 smartphone onto the robot.As i have Accelerometer on the smartphone i can use it to measure rotation movement of the robot.

I tried to explain how it is going to work in the photo.

And the finished robot will look something like this: