Subject: MAX Digest - 13 Nov 1998 to 14 Nov 1998 (#1998-70)
Date: Sun, 15 Nov 1998 00:00:03 -0500
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Reply-To: MAX - Interactive Music/Multimedia Standard Environments
     
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There are 4 messages totalling 195 lines in this issue.

Topics of the day:

  1. Anatek wind machine
  2. piezo cable sensor (2)
  3. Basic Stamp

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Date:    Sat, 14 Nov 1998 15:20:02 +0100
From:    tony brooks 
Subject: Anatek wind machine

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Hi
Can anyone help - I am trying to get hold of a wind machine interface =
made by anatek which is no longer available through my music stores etc. =
I use with MAX and really need this unit - please contact if you can =
help.
Tony Brooks

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Hi
Can anyone help - I am trying to get = hold of a=20 wind machine interface made by anatek which is no longer available = through my=20 music stores etc. I use with MAX and really need this unit - please = contact if=20 you can help.
Tony = Brooks

------=_NextPart_000_0010_01BE0FE2.40107B00-- ------------------------------ Date: Sat, 14 Nov 1998 18:45:10 +0000 From: Eamonn Doyle Subject: piezo cable sensor Hi all does anybody have experience of using piezo cable as a bend sensor? I want to start hacking them for use with the I-Cube and/or other input devices. Eamonn Doyle ------------------------------ Date: Sat, 14 Nov 1998 14:54:38 -0500 From: Dan Trueman Subject: Re: piezo cable sensor Are you familiar with the "flex" sensor from Jameco? Might do the trick: http://www.jameco.com/cfm/viewdesc.cfm?part_num=150551 Dan On Sat, 14 Nov 1998, Eamonn Doyle wrote: > Hi all > > does anybody have experience of using piezo cable as a bend sensor? I > want to start hacking them for use with the I-Cube and/or other input > devices. > > Eamonn Doyle > > McGill is running a new version of LISTSERV (1.8d on Windows NT). > Information is available on the WEB at http://www.mcgill.ca/cc/listserv > ------------------------------ Date: Sat, 14 Nov 1998 20:11:31 -0500 From: Jeff Mann Subject: Re: Basic Stamp Eamonn Doyle wrote: > > Hi Jeff > > I read your posting to the max list about the Basic Stamp II last > month. I am involved in a theatre project which will use max, > somehow interfaced to the movements of an actress. You might be interested in Mark Coniglio's work with dancers wearing resistive bend-sensors: http://www.art.net/~troika - he uses a custom-made 6811 system and software though, not the Stamp or Max. I've done a lot of searching for bend sensors without much luck. The last time I talked to Mark, he had run out of the sensors and couldn't find a source for new ones. I found a place http://www.imagesco.com that that has one. They're a little pricey at $10 US, although not as pricey as I-Cube's $25 US for exactly the same thing! I didn't order any, and I can't find anyone else who sells them. Maybe you can find the manufacturer; I might be interested in going in on a bulk purchase. I found a few places where you can get FSR's (TM), but they only work with pressure, not bend. If you can find any old PowerGloves, you can rip the sensors out of them - unfortunately that's the cheapest solution I've been able to find so far. You have to keep in mind that the output is very non-linear, so you'll need to make some kind of conversion equation or table in software - see the Stamp application note on reading temperature sensors. Personally, I'm still using potentiometers with sticks on them...not pretty, but cheap and linear. > > On another note, do you have any experience using piezo cable as bend > sensors? Axel Mulder, of I-Cube, has done some research but I think he gave up on it and is now using the resistive ones I mentioned. You could ask him. I vaguely recall some problem with them being very high impedance. If you're going to try it, and have difficulty, you might want to try putting a JFET source-follower circuit right at the strip, before sending the signal to the A/D. Let me know how it works as I may be interested in using it myself at some point. A third option might be to use fibre-optic cables, like in the "real" data gloves. Theoretically you just stick an LED on one end and sense the change in brightness with a phototransistor on the other. I've never tried it. > I want to get somewhere between 4 and 10 continuous inputs (probably > FSR's, maybe accelerometers etc), so I presume I have to add an A/D > converter chip somewhere. Is this tricky? The Stamp has a command for reading resistive sensors via a simple R/C timing circuit, so you could read 10 FSR's or the above bend-strips easily. You'd need to test it out to see if the resolution and response time was acceptable. If it's not fast enough or you need to read a voltage-output sensor, then you'll have to add an A/D chip, but that's quite easy. I've used the ADC0838(?) which is an Analog Devices 8-channel, 8-bit converter with serial I/O. There's example code, I think on the Parallax website - let me know if you can't find it. I got the chip from DigiKey for about $10 or so. > Also, what about programming the device? Can this be done (without > too much heartache/headache) from within max, or is it better to do it > from the PC app? (with softPC or similiar). You can't do it with Max, you need to use the PC app. Don't bother buying their "developer's kit" - you can download everything from their website and make your own serial cable. I've found the best thing to do is find an old DOS '286, with a mono monitor, lying on the road (really!) and use that. A couple of other people tried it with softPC and got it to work, but it's a bit fiddly with the serial ports, especially trying to switch back and forth from Max to soft PC. It's much nicer to have a dedicated PC for it. I managed to get the Stamp to send MIDI to Max. It's very easy once you know how. Unfortunately, it's impossible to get the Stamp to receive MIDI, so you need to use the serial object if you want to send anything from Max to the Stamp. I can send you the circuit and the "magic number" you need to set up the serial port for MIDI; I don't have it with me at the moment. If I don't send it by Wednesday, remind me again... > > Maybe I've overloaded this message with question marks, (???!!!) but I > really appreciate any advice! No problem. I'm interested to hear your results - particularly if you find a cheaper source for bend sensors - which should probably save me more work than it took to write this! mailto:jefman@utcc.utoronto.ca || http://www.interlog.com/~jefman Visit the Art & Robotics Group site: http://www.interaccess.org/arg ------------------------------ End of MAX Digest - 13 Nov 1998 to 14 Nov 1998 (#1998-70) *********************************************************