Jitter and ILDA laser format


    Aug 18 2012 | 11:05 pm
    Hi all
    is there anyone knows about how use serial object to talk to the laser projector via USB in ILDA laser format? http://www.laserist.org/StandardsDocs/IDTF05-finaldraft.pdf
    I want to generate jitter matrix in order to control the projector on the fly.
    if it is too hard, then is there anyone know how to control galvometer by arduino?
    Many thanks

    • marnixgeerkens's icon
      Dec 10 2013 | 5:20 pm
      hello ! I don't now how to do this but i was looking for something simular !
      I would like to make the laser beams from a ilda laser moves imultaneously with lasersound produced in ableton live . lfo / ratio etc ..
      this must be possible i guess !!
      can't find anything about it on the internet. hopefully write the code myself someday :)
    • dtr's icon
      dtr's icon
      Dec 11 2013 | 3:43 pm
      Analog control signals are relatively easily generated in Max/MSP and sent out through a suitable audio interface (eg. MOTU) or a dedicated DC interface.
      Next thing I'd like to figure out is how to convert vector/opengl graphics to ILDA.
      Think about safety when working with lasers.
    • wei's icon
      wei's icon
      Dec 11 2013 | 5:38 pm
      yes i saw this project! it's DREAMY. https://cycling74.com/project/fragile-territories/
      it is sound based? but it is already very "graphically", so it only sent the sound to multiple channels to 4 laser projectors? i use to tried sound card method but my m-audio410 only gives 0~24v, laser projectors requires -24~24V, that's the problem. anyway, do i need to modify the circuit in MOTU? if not then it is very good news! i hope Robert Henke can share some patch, just for the sound control...
    • dtr's icon
      dtr's icon
      Dec 11 2013 | 8:01 pm
      It's highly unlikely that your m-audio outputs 0-24V. A standard audio signal oscillates from + to - (AC) and 24V would crazy loud for a line output. Around 5V would be more logical. My MOTU 828mk2 outputs +/-4.5V and my UltraLite mk3 +/-4.1V.
      If your laser needs +/-24V then you will need an opamp to get the signal into that range. I recently worked with +/-5V lasers so it didn't need amplification.
      Important is that the audio interface has to be able to output DC signals. Most filter out DC as a protection. MOTU is one of the exceptions that allow DC and thus can be used for analog control signals.
      About 'sound control', the point that you seem to be missing is that you use audio DSP processes to generate control signals. Is it 'sound'? In a way, but any DSP signal only becomes sound when transduced by a speaker. Before that it's just digital numbers or analog voltages that can just as well be used to control the motion of a laser scanner or the intensity of a beam. That's what's happening here. It's perhaps more helpful to see it as LFO's. If you can draw shapes in an X/Y oscilloscope you can draw them with a laser.
    • geoscle's icon
      geoscle's icon
      Jul 08 2014 | 12:57 pm
      I’ve found out this project but the author won’t reply to messages. It is basically a porting of OpenLase and requires jack for the routing.
      I’ve tried to compile without great success.
      Anyway, I'm having very good results with lasers driven by Max, here's just two basic experiments.
    • JesterN's icon
      JesterN's icon
      Jun 01 2023 | 3:50 pm
      Sorry to self promote but I've been doing this for quite some time, and I give workshops and performances around using Max and Lasers.... you can check here: www.jestern.com. It's a rather large topic to discuss in a post, the best would be to organize a workshop where one can build a DIY connector and learn the first steps.