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(Blinkenwall v1.5)
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== Blinkenwall v1.5 ==
 
== Blinkenwall v1.5 ==
  
Now with up to 70 fps and network mode! Go to [http://10.20.30.26/] to activate network mode and send your [https://secure.wikimedia.org/wikipedia/en/wiki/Netpbm_format P6 PPM] frames to port 1337/tcp. Be sure that all your frames are exactly 146 bytes in size!
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Now with ~30 fps and network mode! Go to [http://10.20.30.26/] to activate network mode and send your [https://secure.wikimedia.org/wikipedia/en/wiki/Netpbm_format P6 PPM] frames to port 1337/tcp. Be sure that all your frames are exactly 146 bytes in size.
  
 
=== Who ===
 
=== Who ===

Version vom 29. Januar 2011, 19:29 Uhr

Blinkenwall..

  • is the wall between our mainroom and the library
  • in this wall are 9x5=45 glassbricks installed
  • next to every glassbrick there is one RGB-led with a pretty neat chip attached
  • these presoldered boards are called Shiftbrite
  • they are currently controlled from an arduino this may change soon for something with more computational power :)
  • Click here to draw something nice on the wall!!


How

SVN with current software https://whatever.metalab.at/projects/blinkenwall

We just connected the Arduino to a fonera 2202 over serial.

Now its possible to stream data for display to the blinkenwall using your favourite webbrowser.


Lessons learned:

  • one can simply connect RX/TX from fonera to arduino
  • no stty in default openwrt busybox build
  • openwrt building is an fairly easy task
  • replacing the busybox binary on a live system during operation is insane and possible! :)

Reference

Who

  • Overflo - electronics, soldering, webinterface, fonera setup
  • Wizard23 - help with electronics, basic software setup
  • Metaz - arduino library software for shiftbrites
  • Nex arduino software for webinterface streaming
  • Mactux CSS + iphone webinterface
  • Natano .C program to decode webinterface streaming files


Blinkenwall v1.5

Now with ~30 fps and network mode! Go to [1] to activate network mode and send your P6 PPM frames to port 1337/tcp. Be sure that all your frames are exactly 146 bytes in size.

Who

  • sqrt2 - Making it work
  • Amir - Netpbm library for Arduino

Lessons learned

  • netcat has fixed-length 8K RX/TX buffers.
  • The Arduino Duemilanove resets on DTS low (the IDE uses that to reset before programming).
  • The Arduino Serial class implements an RX ringbuffer of 128 bytes. Patch the Arduino SDK to adjust this to your needs; RX_BUFFER_SIZE in hardware/arduino/cores/arduino/HardwareSerial.cpp.
  • mkfifo(1) is neat when opening ttyUSB* devices leads to an Arduino reset.

Videos


Photos

Another Backside close-up
Backside close-up
Backside close-up with flashlight
Webinterface Screenshot


Various Links