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1  Community / Exhibition / Gallery / Made a tiny WiFi LED matrix that displays scrolling tweets. on: September 17, 2012, 08:38:37 am
I would like to share with you, my most ambitious project to date: Scrolling Tweets.

I built a tiny Arduino based device that scrolls the latest tweets from The Verge magazine's twitter feed on my table top using an LED Matrix Display via WiFi.

You should just see it in action, really. Scrolling Tweets - A tiny display for the latest news on Vimeo. -

It uses an LED Matrix, which is driven using an Arduino Uno. The Uno is connected to the internet via a Sparkfun WiFly Shield. It pings a simple heroku app that scrapes the twitter feed of a particular account. The response is then parsed and scrolled on the matrix.

Also it is completely wireless because it is powered from Li-Poly batteries using a Sparkfun LiPower Shield.

Some more pictures follow:





I have done a complete writeup on the project along with all the code, on my website with all the code.

http://www.paramaggarwal.com/post/28330849923/scrolling-tweets-a-tiny-display-for-the-latest-news

Please do check it out and let me know what you'all think!
2  Topics / Home Automation and Networked Objects / I built a fully wireless Twitter display for my table top. on: July 30, 2012, 06:43:07 am
I just completed a tiny matrix display that scrolls tweets from The Verge's account for the latest tech news on my table top.

It is battery operated and it fetches tweets using a WiFi device. Hence it is completely wireless.

Check it out here with video: http://www.paramaggarwal.com/post/28330849923/scrolling-tweets-a-tiny-display-for-the-latest-news

Thanks!
3  Forum 2005-2010 (read only) / Development / Buying an Arduino in India on: October 08, 2008, 02:05:13 am
Is there an Arduino supplier in India? Awesome stuff.
4  Forum 2005-2010 (read only) / Exhibition / Re: MiniPOV with Accelerometer !! on: October 09, 2008, 11:55:33 pm
@mem

okie... i'll try that!
5  Forum 2005-2010 (read only) / Exhibition / Re: MiniPOV with Accelerometer !! on: October 09, 2008, 12:25:38 pm
@mem,

In the code above instead of

int text_array[475]

I used

int PROGMEM text_array[475]

and included the header file too...
6  Forum 2005-2010 (read only) / Exhibition / Re: MiniPOV with Accelerometer !! on: October 09, 2008, 11:42:19 am
Hey guys, I love the reponse!!!
I have even been blogged on MAKE!
Considering the fact that I am just 18yrs old, I definitely feel proud!
Thanks everyone!

@myozone & @Grumpy_Mike
Ya, even I read about an idea to put some solder blob on a piece of guitar string and have it sense the jerk. But why not do it the high tech way!!

@Syvwlch
Thanks...

@mem
I was using progmem but it was causing problems, I mean to the extent of displaying rubbish... I never found out the reason...

Blog on MAKE: http://blog.makezine.com/archive/2008/10/arduino_minipov_with_acce.html

My Site: http://www.feemoelectronics.com
7  Forum 2005-2010 (read only) / Exhibition / Re: MiniPOV with Accelerometer !! on: October 08, 2008, 05:10:13 am
Hey mem, thanks!

Thats an interesting suggestion from you! Never thought of it. Just copy pasted that library....
8  Forum 2005-2010 (read only) / Exhibition / Persistence of Vision Display with Accelerometer on: October 08, 2008, 02:05:59 am


In this project I have fixed an accelerometer to a 10-segment display (it has 10 green LEDs put into a single component) and used an Arduino to control it.



So there you have it. As you wave it, it senses this motion and switches ON the display. And one another benefit that I was really looking for is that it writes only from left to right. I mean when you wave your hand it goes left to right to left. Right? My old AccPOV was amateur enough to keep displaying text all the time left to right and back too. So that has been eliminated. And its so cool now!

I am calling it the AccPOV that is a accelerometer based Persistence of Vision Display. I really liked this idea  of an Accelerometer that I got though it is commonly available on the net. Code attached. You need Arduino software to compile it.



The Blue Board is the Arduino Decimelia. It programs and takes power from the USB(the grey wire).





The General Purpose PCB is a shield; which is the word used for attachment boards created for the Arduino.

I have mounted the display on that.





Then the tiny green PCB on the side is the Accelerometer Board. So thats it. Took one and half day to materialize.

Next I plan to use RGB LEDs to be able to see 6 colors!! So that should be fun!

Thanks for Reading!! I know it all sounds too formal, as if I am selling something. But it is just a discussion. A concept.

In case you don't get the heck what I am talking about read this: This project uses Persistence of Vision. So I can use just 8 LEDs (Yes, I am just using 8 of them. ) to display text. Now as you wave it in the air, the 8 LEDs quickly change states to appear as if something is written in the air. It gives superb effect in the dark. For effect in the daylight I need very bright LEDs. So as simple as that. Just wave and read.





You can mail me at paramaggarwal@gmail.com for criticism and comments.

Accelerometer:

Three axis accelerometer from Freescale that gives analog voltage proportional to acceleration. You measure that voltage using a micro controller and you get acceleration!

Controller Board:

Arduinos are so easy!! More info about them at arduino.cc. It is based on the ATMEGA168 with bootloader.

Have a look at sparkfun.com for some great electronics tutorials.







Arduino Code: http://dl.dropbox.com/u/3134506/POV-display-accelecrometer-code.c
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