drumwide Posted January 2, 2004 Report Share Posted January 2, 2004 Hello All, It's been a while since my last post. I am in the process of making an application to interface piezo triggers to MIOS. The triggers will be connected to a modified version of the analog side of admir's circuit.This circuit is complete and in the testing phase,and I am now working on the code.The application will be released as a stand alone application first and then I will attempt to implement it into the MB64 code,so the triggers can replace some of the pots.If anyone has interests or ideas please let me know. Quote Link to comment Share on other sites More sharing options...
pay_c Posted January 2, 2004 Report Share Posted January 2, 2004 Question: Where do you get those Piezos for a reasonable price? Would be absolutely interested, too, but cant find them. Quote Link to comment Share on other sites More sharing options...
d2k Posted January 2, 2004 Report Share Posted January 2, 2004 any of these suitable:http://www.allelectronics.com/cgi-bin/category.cgi?category=466&type=store? Quote Link to comment Share on other sites More sharing options...
drumwide Posted January 3, 2004 Author Report Share Posted January 3, 2004 I bought mine from http://www.mouser.com/, because it is close to where I live.They cost about 3/$1.00 American dollars. Quote Link to comment Share on other sites More sharing options...
Steven_C Posted January 3, 2004 Report Share Posted January 3, 2004 In Australia, NZ, they are available from Jaycar, you just buy a piezo transducer (buzzer) and pull it out of the plastic casing (acoustic resonator, like a guitar) and then it works ok as a trigger. around $3 aus each Quote Link to comment Share on other sites More sharing options...
pay_c Posted January 4, 2004 Report Share Posted January 4, 2004 OK, cool. I had those naked ones in my mind.If you use those buzzers, pulling out the piezo, it's also available @ Reichelt (here in Germany). ;DTHNX!!Looking forward...Ideas: Aftertouch implementing (sending the velocity with the note on and after that aftertouch)? Would be cool... Quote Link to comment Share on other sites More sharing options...
Steven_C Posted January 4, 2004 Report Share Posted January 4, 2004 I don't think those piezo's can send aftertouch, as they need a percussive hit, to generate a voltage spike. Unless the aftertouch was 'fake' i.e. added by the microcontroller after each hit. Quote Link to comment Share on other sites More sharing options...
admir Posted January 4, 2004 Report Share Posted January 4, 2004 Hi Drumwide,Thorsten invited me to participate on this topic, and I'm glad if I can help.Regards,Admir. Quote Link to comment Share on other sites More sharing options...
Nomical Posted January 4, 2004 Report Share Posted January 4, 2004 Hi Drumwide,Thorsten invited me to participate on this topic, and I'm glad if I can help.Regards,Admir.The E-drum man.... Quote Link to comment Share on other sites More sharing options...
pay_c Posted January 5, 2004 Report Share Posted January 5, 2004 I don't think those piezo's can send aftertouch, as they need a percussive hit, to generate a voltage spike. Unless the aftertouch was 'fake' i.e. added by the microcontroller after each hit.Nope. They just need that for high voltages (so for the velocity). If you have a changing pressure, the voltage changes, too, but in a veeery small amount (and only changes linear to the *variation* of that pressure - not directly linear to the pressure itself) .Really don't know if you can use that or even if its worth it... was just an idea ... :) Quote Link to comment Share on other sites More sharing options...
drumwide Posted January 6, 2004 Author Report Share Posted January 6, 2004 I am humbled by the presence of such character. Thanks, to all of you.I will keep you all updated, as I presume there will be many questions that require your expertise.thanks again, David. Quote Link to comment Share on other sites More sharing options...
drumwide Posted January 9, 2004 Author Report Share Posted January 9, 2004 Midibox Drum Triggers working now. Still need some tweaks on the software and hardware sides but it is coming along nicely(thanks to TK's drum trigger driver).I wan't to tweak it a little more before the first release.I haven't started the implementation for MB64 yet but, Thorsten has made his code very easy to understand. So maybe it won't take me to long to get a working version up and running.;D Â drumwide all smiles about MB drums!!!!!!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
d2k Posted January 9, 2004 Report Share Posted January 9, 2004 Well done fella! ;DTime to get some piezos in :PBestDan Quote Link to comment Share on other sites More sharing options...
basta73 Posted January 10, 2004 Report Share Posted January 10, 2004 Admir,What happened with your original go.to site? Quote Link to comment Share on other sites More sharing options...
basta73 Posted January 10, 2004 Report Share Posted January 10, 2004 Will each module employ a scalable, slave-core model, like the MF module?8 triggers per slave core?I am very excited about this one. ;) Quote Link to comment Share on other sites More sharing options...
admir Posted January 11, 2004 Report Share Posted January 11, 2004 Admir,What happened with your original go.to site?Don't know, they just shut it down... but it is only a redirector service, my site is (and always was) at:http://www.terra.es/personal4/admir_s/Regards,Admir. Quote Link to comment Share on other sites More sharing options...
drumwide Posted January 12, 2004 Author Report Share Posted January 12, 2004 Will each module employ a scalable, slave-core model, like the MF module?8 triggers per slave core?I am very excited about this one. ;)Yes the trigger to analog interface(buffer circuit) will handle only 8 inputs right now. So if you used 8 slave modules you can get 64 triggers to the core in muxed mode. Using the ainx4 modules.I haven't tested this yet as I am only in the first phases of development.But in theory this is how it works. Quote Link to comment Share on other sites More sharing options...
basta73 Posted January 13, 2004 Report Share Posted January 13, 2004 ;D Quote Link to comment Share on other sites More sharing options...
admir Posted January 15, 2004 Report Share Posted January 15, 2004 Hey, drumwide, Yes the trigger to analog interface(buffer circuit) will handle only 8 inputs right now. So if you used 8 slave modules you can get 64 triggers to the core in muxed mode. Using the ainx4 modules.Why don't you post the schematics, so we can discuss it...PS. My URL changed, bookmark this one:http://personal.telefonica.terra.es/web/admir/Regards,Admir. Quote Link to comment Share on other sites More sharing options...
Sephult Posted January 16, 2004 Report Share Posted January 16, 2004 Has there been any ideas on making the triggers velocity sensitive? I was originally planning to split my output line between 1 AIN and 1 DIN (DIN for trigger, AIN for velocity level). As of now I am not shure if there will be any problems but I am hoping to try it out soon. I Hope this idea will help out. -Sephult Quote Link to comment Share on other sites More sharing options...
Steven_C Posted January 16, 2004 Report Share Posted January 16, 2004 midi drum triggers usually get velocity from the level of the voltage the piezo's make when they are struck, I thought Quote Link to comment Share on other sites More sharing options...
pay_c Posted January 16, 2004 Report Share Posted January 16, 2004 Isn´t just an AIN reqired?The rest could be done by code: A certain voltage must be achieved to send a Note on/off and the max voltage for the velocity.No DIN required... or? ??? Quote Link to comment Share on other sites More sharing options...
drumwide Posted January 16, 2004 Author Report Share Posted January 16, 2004 (edited) Hey, drumwide, Why don't you post the schematics, so we can discuss it... I will post the eagle .brd file and the code as soon as I find a place to put it(what server).I have no website.If any one would like a copy before I get it posted email me: Â Â Â Â Â Â Â Â Â Â Â Â Â dwide.dwide@gmail.com SEPHULT: Â Â Yes the triggers will be velocity sensitive. STEVEN_C: Â Yes the sensitivity is set by the amount of electricity provided by the piezo. PAY_C: Â Â No, din is required, but you need the buffer circuit to amplify the voltage of the piezo and to hold it long enough for the ain to measure it. My testing methods are not the greatest in the world so progress is slow ,but I am in the process of making more triggers so to update you all: I only have two triggers working now. both are working in the midibox drum trigger application and in the addin for the midibox64.As I get more triggers made I will test more. The first version of the midibox drum triggers (v1.5) is running on MIOS 1.5 and has no bells and whistles(menus,encoders,buttons,or anything).the velocity seems to work fine after a little adjustment to the values of risng threshhold. Will post more ASAP :D Edited September 19, 2010 by drumwide Quote Link to comment Share on other sites More sharing options...
admir Posted January 17, 2004 Report Share Posted January 17, 2004 Hi all,Just to clarify:Digital inputs are not needed, everything is done with analog inputs.BUT, because of low sampling rate (~200us per channel), the sample-and-hold circuit is needed.Here you have two choices:1. complicate your life and have a true S&H with reset and those things (2 OP-AMP per channel + 1 analog switch - as minimum), or2. have a low-pass filter (something like in my design) to iron the signal a little.I'm really not sure what will be needed in this particular case, that's why I'll try to help Thorsten to improve ADC speed somehow ;-) It will be important when you start testing fast rolls, belive me.Lastly, but not less important, a BIG THANKS to Thorsten, this time for provding me a server space for eDrum design, this will be my main site from now:http://edrum.midibox.org/Regards,Admir. Quote Link to comment Share on other sites More sharing options...
uclaros Posted January 19, 2004 Report Share Posted January 19, 2004 One little possibly stupid question...what's not good with the original edrum project?You do all this fuss just to integrate into mios the piezo pads?I was considering to build the edrum thing but now I'm into thoughts!Isn't the edrum velocity sensitive? Quote Link to comment Share on other sites More sharing options...
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