Posted by Nikolaus Gradwohl
Sun, 22 Aug 2010 12:02:35 GMT
I made another animation with Context Free Art and a small ruby script. The scroll down to see the sourcecode I
have used for this file. This animation uses the same technique i used for my first one
Posted by Nikolaus Gradwohl
Sat, 05 Jun 2010 16:17:00 GMT
I always wanted to see where the readers of my blog are comming from, so I took a picture frame and inserted a world map, a handfull of leds and an arduino. Some soldering and some rubyscripts later I had my hardware geo-aware logfile visualization.
I have a script running at the server that parses new ip adresses from the log file and geocodes them. Than the continent code is
sent to my mac where i have a little script that forwards the continent code to the serial port. And finally the arduino in the
picture frame is making the leds blink. The whole project was hacked together as a weekend project so the scripts might need some
"fine-tuning" :-)
Posted by Nikolaus Gradwohl
Sun, 06 Sep 2009 02:48:00 GMT
In linux every input device registers under /dev/input/eventX and sends events in 16 byte blocks.
these data chunks contain a timestamp the event type, the event code and a value
depending on the event type the semantic of value changes. for a event type 1 (key event) value 1 means pressed
and value 0 mean released.
here is a little ruby program that reacts to key press events and sends osc messages. which could trigger drum sounds,
start play back, ...
key press events are not only sent by keyboards but also by mice, joystics, gamepads, a DDR mat, a buzz buzzer, ...
the code example is used to map keys of my PS3 Controller to drum sounds.
require 'osc';
c = OSC::UDPSocket.new
hh = OSC::Message.new('/drum', 's', "hh" )
bd = OSC::Message.new('/drum', 's', "bd" )
sn = OSC::Message.new('/drum', 's', "sn" )
File.open("/dev/input/event7") do |f|
while true
event = f.read(16).unpack("llSSl")
time = event[0] + event[1] / 1000000.0
type = event[2]
code = event[3]
value = event[4]
puts "Ti: #{time} T: #{type} C: #{code} V: #{value} " if type == 1
c.send( bd, 0, 'localhost', 3334 ) if type == 1 && code == 298 && value == 1
c.send( sn, 0, 'localhost', 3334 ) if type == 1 && code == 293 && value == 1
c.send( hh, 0, 'localhost', 3334 ) if type == 1 && code == 303 && value == 1
end
end
Posted by Nikolaus Gradwohl
Mon, 13 Apr 2009 12:57:00 GMT
i updated my osc sequencer in ruby. now it doesn't just send osc events but also react to it. i made a small
processing sketch that sends osc play,pause,stop events for each track in the sequencer.
i also refactored the ruby code a bit, to use classes. next steps i plan are to separate the sequencer code
from the sequences and allow sequences to be added or deleted at runtime via osc messages.
the code isn't very reusable now, so i still considere this more as a prove of concept, but i like the idea
of separating the frontend and the backend via osc events and having sequences that can run independently.
that should enable some nice osc controlled audio/video installations.
write me a comment or mail if you have some ideas for improvement or if you use the code in one of your
projects
Posted by Nikolaus Gradwohl
Sun, 15 Feb 2009 07:15:00 GMT
I made a new version of the ical flowers sketch
i wrote in dezember. This time it doesn't only show a flower for every event in my calender, it also shows
the current weather (using the rubyweather library)
the sky color changes depending on the current time
the system consists of a ruby-proxy, an arduino sketch and a processing sketch.
the ruby proxy starts a web-server on port 2000. It fetches the current weather using the
rubyweather gem, fetches the events from the configured caldav calenders, and
fetches the current temperature from the arduino using ruby-serial
the arduino sketch is basicaly the same as in this blog post. the only change is
that the arduino only sends the temperature when the host sends a 'C' over the serial line
the processing sketch finally fetches the data via http from the proxy and displays it ( using my icap4p library.
the screen is updated every 1/2 hour using the method described here
Posted by Nikolaus Gradwohl
Tue, 10 Feb 2009 02:13:00 GMT
on saturday i was asked by a ruby-newbie (sorry - i had to write it :-) ) whats the difference between
a symbol, a string and a constant in ruby. even tough there are realy, realy many articles about ruby symbols
( a google search for "ruby symbols" results in 1,340,000 hits - so this is the 1,340,001 aricle covering the
topic) there is obviously still some confusion out there. So i try my own definition here.