[PD] control voltage

[rodney]

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

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-----Original Message-----
From: pd-list-admin at iem.at [mailto:pd-list-admin at iem.at] On Behalf Of Martin
Peach
Sent: Friday, December 10, 2004 2:20 AM
To: pd-list at 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





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