I’m a graphic design student, and my final project is to visualize the sound in Thai poetry using LED light as a medium.
The result is going to be like when you listen to the verse but you will see the sound(light) rather than hear it.
There is 66 of LEDs appears one by one (each one represents one sound) until the end of the verse. Therefore, in my case, if I want to control the lighting circuit from the computer, do you think max/msp is the right software for me?
And, if yes, do I need any hardware to connect computer and the circuit?

Thank you very much.

The status bar grows/shrinks with horizontal window size, so making
the window wider may help.

However, externals written in C have a maximum string length of 64
chars and I think that limit applies also to mxj, javascript, and
abstractions.

Hope this helps — P.

————– http://www.bek.no/~pcastine/Litter/ ————-
Peter Castine +–> Litter Power & Litter Bundle for Jitter

iCE: Sequencing, Recording & |home | chez nous|
Interface Building for |bei uns | i nostri|
Max/MSP Extremely cool http://www.castine.de

http://www.dspaudio.com/

It’s not like a musical melody. it’s combined with intonation and relative pitch related to former phonemes, add some timbral changes and a big bunch of randomness.
been reading a book about it and well, it seems like hell to me to get anything non-random out of it by analysis.
anything more appropriate than pitch analysis of a non-tonal language at least.

ok, maybe you weren’t witing for that, but im posting anyway : )

TELEO http://makingthings.com/
Phidgets http://www.phidgets.com/ , and
Arduino http://www.arduino.cc/

But i still don’t quite understand how does it work about the digital output, they all have not enough digital output for my 66 separate LEDs, my question is, do I need 1 digital output per 1 LED, or do I need just 1 digital output to connect the whole LEDs circuit?

Thank you

Kool, depending on how quickly you pick up breadboarding/soldering and
programming microcontrollers, you could be switching on and off 66 separate
LEDs from Max, by the end of next week (about 40-50 hours of research, and
production).

You would need 18 digital pins to control 66 separate LEDs.
16 of them could cover 64 LEDs when configured in a row collumn scan:
8 digital pins emit voltage or not, and 8 digital pins would sink voltage or
not. The remaining two pins would be used for the two LEDs that did not get
addressed in the array.

This assumes you are building the LED circuit. If you have a serial
controlled LED display than you may not need all those digital i/o

Essentially what you do is drive each row low in rapid sequence,
while driving high the columns that need to be on in that row – the
output just keeps cycling round continually. One approach to this
might be to use a coll. If you use line index as the row reference
and store the column data in the coll for each row, you can devise an
output routine that simply reads the coll row-by-row continuously.
When you want to change the state of one LED you simply write new
data into the appropriate row index of the coll.

A lot of interfaces have a mix of analogue and digital inputs and
outputs – look for one that has enough digital outputs and not much
stuff that you won’t need. Teleo have a 12 digital output module, so
you would need two of those at USD149 each. Phidgets only do a mixed
module. I can’t get the Arduino site to respond and I can’t remember
the exact spec of their unit – but they are very cheap, so that is
worth looking at.

Best

L
Lawrence Casserley – lawrence@lcasserley.co.uk
Lawrence Electronic Operations – http://www.lcasserley.co.uk
Colourscape Music Festivals – http://www.colourscape.org.uk

But I can help you:

You need to multiplex your outputs!
http://www.seattlerobotics.org/encoder/200311/dickens/Multip lexing%20Atricle.html

Another way is using a LED driver like the MAX6955. Needs only two outputs
of your microcontroler to manage it (serial i2c communication):

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3540

You can make a LED matrix too! THis way, with 16 output pins, you can
drive 64 LEDs. 17 outputs give you 72 LEDs. It’s difficult to explain by
text without picture… I’ll try:

-8 pins are columns, 8 pins are rows.
-8 columns X 8 rows = 64 intersections.
-I plug a LED at each intersections, negative pin pluged to the row,
positive pin pluged to column.

-SO, if my column#2 pin is positive and my row#3 is negative, it lights
LED#18 (intersection of column2 and row3).
-If you want to light several LEDs at the same time: Just open and close
each LED in sequence very very fast (less than 5milliseconds). Similar to
the “cinema illusion”, your retina won’t see the sequence. You will see
the LED lightened simultaneously.

If this seems too complex for you, well it is normal if you never made any
electronic circuits and microcontroler programming! You won’t be able to
learn and make your project in 1 month I guess. Unless you’re a good
autodidact and already know a programming langage! Meaby you’ll need to
hire a guy like me… :-) But if you try by yourself, you’ll see when all
info is collected, it’s a really easy task. Look for tutorials abut LED
matrix. There’s alot of BAsic Stamp related tutorials on the internet.
Basic stamp is perfect for the beginner and they have a mac compiler. Easy
Basic langage for programming and a lot of ressources for newbies and
autodidacts. If you continue to play with microcontrolers in the future,
meaby you’ll need a better and “professionnal” microcontroler…. But for
beginning, i highly recommend Basic Stamps (look to Stamp Stacks at
Hvwtech.com).

TELEO and PHIDGET are not microcontrolers. You cannot download a program
into them. But they are really MAX-friendly! If it’s possible to make a
8×9 LED matrix with it, well I definitively suggest you to use TELEO! It’s
the simplest way. But I don’t think you can make the “matrix tactic” with
a TELEO… Anybody can answer that? But I know you cannot manage a LED
driver such as the MAX6955 with TELEO or Phidget.

I know TELEO is modular, wich means you can plug several output switch
modules until you got 66 switches. I never used TELEO, my advice could be
wrong.

Never forget to put a resistor in series with each LED, unless it’ll burn!

Good luck!
pc

there are student licenses and a superb user forum, too.

-110

Cheers,