[sugar] TurtleArt, Logo, and XOs

Edward Cherlin echerlin
Fri Jun 27 15:16:39 EDT 2008

This is wonderful. Thank you. I have been wishing for some of these
features, particularly multiple sensor input and lower frequencies.
Many bass and contrabass wind instruments and standard keyboard
instruments go below 100 Hz.

The note A above middle C (A4, MIDI 69) is 440 Hz, so four octaves
below, the lowest note on a piano, is A0, 27.5 Hz, MIDI 21. (MIDI runs
about five octaves above and below, beyond the limits of human hearing
on the low end). It would be awesome to be able to demonstrate 32 ft
and 64 ft organ pipes, which go down to five octaves below middle C,
with a frequency of 8.2 Hz. You can't hear it, but you can feel it in
your bones. I have seen such pipes on an organ in England, where
legend has it that naughty choirboys were stuck in the very biggest to
be shot up to the top and let down again on the air blowing through.

On Fri, Jun 27, 2008 at 11:33 AM, Arjun Sarwal <arjun at laptop.org> wrote:
> On Fri, Jun 27, 2008 at 7:14 PM, Brian Silverman <bss at media.mit.edu> wrote:
>> hi
>> sorry for the delay in responding... been busy.
>>> I hear you don't have a recent XO!   Please add yourself to our
>>> contributors database and we will send you a laptop asap : projectdb.olpc.at
>>> <http://projectdb.olpc.at>
>> thank you for this. I haven't added myself yet but plan on doing so in the
>> coming weeks.
>>> There's also the TurtleArt with Sensors project, which should probably be
>>> merged back into the TurtleArt trunk -- you should talk to arjun sarwal
>>> about this.
>>> http://wiki.laptop.org/go/Measure#Sensor_Input_into_Turtle_Art
>>> http://wiki.laptop.org/go/Activities#Programming
>>> http://wiki.laptop.org/go/Turtle_Art
>> Yes, we should talk about this. My preference, if possible, is to somehow
>> keep the versions separate. As I'm sure you've noticed, the design aesthetic
>> of TurtleArt is quite minimalist. There are a lot of possible additions that
>> were "obvious" that I ignored anyway. Sensors are a really good idea.
>> However, rather than viewing them as an extension  I'd prefer to view them
>> as part of an alternative version.
> Dear SJ, Brian :
> Perhaps Turtle Art could then be the 'upstream version'  and I could
> maintain the 'Turtle Art with Sensors' fork ..?
> Thoughts ?
> ---
> Dear Community:
> I have been working on a modification of Turtle Art with sensors that
> works better than the version that has gone in Peru Activity pack. The
> earlier one needed me to do gstreamer Kungfu to get the samples of
> sensors/sound. The new version uses python-alsaaudio. When
> python-alsaaudio (#6535) is included in builds getting samples(AC/DC)
> from ADC becomes much easier and straightforward.
> Also, I have been working upon re organizing the pages associated with
> Measure Activity and Sensors with the aim that there should be easily
> accessible information for people who visit the page. For example
> educators click straight away on the educators section, people who
> want to 'hack around' have access to the appropriate links..etc.
> A very rough outline here http://wiki.laptop.org/go/Measure/New_temp
> We can replace the main Measure page
> (http://wiki.laptop.org/go/Measure) once perhaps we can sufficiently
> In particular it'd be great if someone could help in --
> * pulling off all the content on Measure page or linked off the
> Measure wiki page and re-organizing it in the new format
> * giving feedback or helping in the  proposed topics/sections of the
> re-organized page
> * help add more activities / projects around Measure sensors or Turtle
> Art with (though if one sees links off the Measure page, there are
> already
> * exporting a relevant page set to sugarlabs wiki
> I hope to be doing a release soon of Measure Activity in a week or so.
> It has been almost a few months late than I had planned it to be out.
> I have been working on changes in the codebase that make it more
> easily extensible (for example displaying more than one graphs, say
> upto 5 while not letting update rate/frame rate drop too low). Other
> changes that I have been working on are making it easier to read
> values (in the previous version the calibrated values in terms of
> voltage are not fully correct), adding support for more lower range
> frequency signals to be displayed well (For example certain Health
> peripheral projects are requiring to show as low as 10Hz signals)
> In the future, I hope to release soon and more regularly with
> incremental changes rather than a lot of changes and a long gap in
> releases.
> many thanks,
> Arjun
> ps -- Sorry for this 'mashed up' email consisting of a lot of topics,
> I hope to follow up on separate specific topics in separate threads
> soon...
>> Brian
>> p.s. - is the XO-2 real enough yet to start thinking about?
> --
> Arjun Sarwal
> http://dev.laptop.org/~arjs
> http://youtube.com/watch?v=SwcSEcfR464
> _______________________________________________
> Sugar mailing list
> Sugar at lists.laptop.org
> http://lists.laptop.org/listinfo/sugar

Edward Cherlin
End Poverty at a Profit by teaching children business
"The best way to predict the future is to invent it."--Alan Kay

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