hi all,
is there a way to read control voltage output in pd using a soundcard? what object should i use with adc~? can i simply plug the CV (maximum of 6 volts) to my soundcard or i need to buy an analog to digital converter?
patrick
patrick wrote:
hi all,
is there a way to read control voltage output in pd using a soundcard? what object should i use with adc~? can i simply plug the CV (maximum of 6 volts) to my soundcard or i need to buy an analog to digital converter?
Soundcards usually are capacitively coupled to their inputs, so the response drops off as the frequency drops below a few cycles per second, leaving no response at all for DC, which control voltage mostly is. One way around would be to pass the CV through an analog multiplexer that was rapidly switching between your CV and ground. If you know how to do electronics a bit you could use a 4052 analox mux and a 555 oscillator running about 1kHz to switch it. I would go for a PIC16F88 microcontroller, which has 7 10-bit ADC channels, outputting MIDI.
Martin
patrick
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On Thu, 9 Dec 2004, Martin Peach wrote:
patrick wrote:
is there a way to read control voltage output in pd using a soundcard? what object should i use with adc~? can i simply plug the CV (maximum of 6 volts) to my soundcard or i need to buy an analog to digital converter?
Soundcards usually are capacitively coupled to their inputs, so the response drops off as the frequency drops below a few cycles per second, leaving no response at all for DC, which control voltage mostly is. One way around would be to pass the CV through an analog multiplexer that was rapidly switching between your CV and ground. If you know how to do electronics a bit you could use a 4052 analox mux and a 555 oscillator running about 1kHz to switch it. I would go for a PIC16F88 microcontroller, which has 7 10-bit ADC channels, outputting MIDI.
I second that. I have done that with a NS555 oscillator a few years ago and it works.
Another solution might be to reuse the STROBE pin of the parallel port. That's pin #1. By default it outputs a 9600 Hz square wave used to sync the data sent on pins #2-9. That one can be used to control a (pair of) transistor(s). The second transistor would be used to connect to ground if necessary. That's just an idea. I say that because it's the one idea that requires the least special hardware.
The Pd part required after that is to find the peaks or average. Many ways to do it; I might try [lop~] first.
Mathieu Bouchard -=- Montréal QC Canada -=- http://artengine.ca/matju
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If you use the PIC 18F452 (or any 18F) you can use my tutorials at http://www.0x09.com/Marlboro/physcomp/ on getting analog info from a PIC to PD. It's not complete yet, but there's enough there for you to chew on until I finish it up in the next few weeks. The tutorials are probably useful for the PIC 16 series too, but I wrote it with 18F in mind.
The tutorials are meant to be pretty layman-ish, so if you don't understand anything, I'd love feedback so I can improve it.
Cheers, Ian
Mathieu Bouchard wrote: | On Thu, 9 Dec 2004, Martin Peach wrote: | |>patrick wrote: |> |>>is there a way to read control voltage output in pd using a soundcard? what |>>object should i use with adc~? can i simply plug the CV (maximum of 6 volts) |>>to my soundcard or i need to buy an analog to digital converter? |> |>Soundcards usually are capacitively coupled to their inputs, so the |>response drops off as the frequency drops below a few cycles per second, |>leaving no response at all for DC, which control voltage mostly is. One |>way around would be to pass the CV through an analog multiplexer that |>was rapidly switching between your CV and ground. If you know how to do |>electronics a bit you could use a 4052 analox mux and a 555 oscillator |>running about 1kHz to switch it. |>I would go for a PIC16F88 microcontroller, which has 7 10-bit ADC |>channels, outputting MIDI. | | | I second that. I have done that with a NS555 oscillator a few years ago | and it works. | | Another solution might be to reuse the STROBE pin of the parallel port. | That's pin #1. By default it outputs a 9600 Hz square wave used to sync | the data sent on pins #2-9. That one can be used to control a (pair of) | transistor(s). The second transistor would be used to connect to ground if | necessary. That's just an idea. I say that because it's the one idea that | requires the least special hardware. | | The Pd part required after that is to find the peaks or average. Many ways | to do it; I might try [lop~] first. | | _____________________________________________________________________ | Mathieu Bouchard -=- Montréal QC Canada -=- http://artengine.ca/matju | | | _______________________________________________ | PD-list@iem.at mailing list | UNSUBSCRIBE and account-management -> http://iem.at/cgi-bin/mailman/listinfo/pd-list
My pick for this kind of job would be this box by Angelo Fraietta : http://www.users.bigpond.com/angelo_f/instruments.html
it has a lot of analog and digital ins and outs and the connectors are compatible with the i-cube sensors etc. The "Dumb Controller" can be set up via MIDI from your computer using a Max-like "boxes and wires" language. The "Smart Controller" has its own CPU and can be used at gigs and in installations without a PC.
The price is cheaper than most other boxes, I've seen.
Rod
Rodney Berry ATR Media Information Science Laboratories Kyoto Japan
http://www.mis.atr.jp/~rodney Ph: +81-774-95-1449 Fax: +81-774-95-1408
-----Original Message----- From: pd-list-admin@iem.at [mailto:pd-list-admin@iem.at] On Behalf Of Martin Peach Sent: Friday, December 10, 2004 2:20 AM To: pd-list@iem.at Subject: Re: [PD] control voltage
patrick wrote:
hi all,
is there a way to read control voltage output in pd using a soundcard? what object should i use with adc~? can i simply plug the CV (maximum of 6 volts) to my soundcard or i need to buy an analog to digital
converter? Soundcards usually are capacitively coupled to their inputs, so the response drops off as the frequency drops below a few cycles per second, leaving no response at all for DC, which control voltage mostly is. One way around would be to pass the CV through an analog multiplexer that was rapidly switching between your CV and ground. If you know how to do electronics a bit you could use a 4052 analox mux and a 555 oscillator running about 1kHz to switch it. I would go for a PIC16F88 microcontroller, which has 7 10-bit ADC channels, outputting MIDI.
Martin
patrick
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Ian Smith-Heisters -
Martin Peach -
Mathieu Bouchard -
patrick -
rodney