[PD] Sensors

[Olaf Matthes]

Hi, Christan Klippel has made the CVBOX interface: 88 channel AD
converter with 8, 10 or 12 bits of resolution. Connects to the parport.
Schematic, circuit boards and externals for Pd (Linux/Win), jMax and Max
(Win) available online. Try:
http://www.nullmedium.de/dev/hardware/cvbox.html

Christian also is working on a USB version but I don't know when this
will be finished.

Olaf

"B. Bogart" schrieb:
> 
> Hey Johannes,
> 
> Have you heard of the AID project? (www.interaccess.org)
> 
> We're making a GPL PIC16F877 based general sensor platform for artists in
> particular. We already have 8 channels AtoD, 2 PWM ports, I2C and a 8bit bus
> to communicate with up to 16 digital "peripheral" cards. Its got only Serial
> interface for now, but we're working on USB as well.
> 
> I've also started a suite of control abstractions for PD, based on the
> comport and ascii externals.
> 
> We're always looking for help (especially in programming- we're using hitech
> C) Please jong the mailist or drop me a line if your interested in
> contributing.
> 
> Ben
> 
> ----- Original Message -----
> From: "Johannes Taelman" <Johannes.Taelman at UGent.be>
> To: "Chris McCormick" <chris at mccormick.cx>
> Cc: <pd-list at iem.at>
> Sent: Saturday, November 01, 2003 5:59 PM
> Subject: Re: [PD] Sensors
> 
> > On Fri, 31 Oct 2003, Chris McCormick wrote:
> >
> > > Hi,
> > >
> > > An idea I had recently (though I'm sure it's not original) is to hook up
> > > 8 555-timer circuits with variable resistors to the parallel port and
> > > poll it periodically to figure out the frequency of the 8 squarewaves on
> > > individual parallel port pins.
> > > These frequencies could be used as control values in a Pd patch. The
> > > advantages are that 555 timer circuits with a variable resistor are
> > > very cheap, and simple. Your range would be from where frequency updates
> > > are too far between (let's say 100Hz) to the upper-range of the parallel
> > > port polling frequency. So if you can poll it at 8000Hz you would
> > > probably want to stop at nyquist to get meaningful updates let's say at
> > > 4000Hz (not quite certain that nyquist is relevant here though).
> >
> > How about timing the pulse width (from the capacitor discharges) directly,
> > instead of counting the frequency? The legacy joystick port works this way
> > (also using polling).
> >
> > Still, if you want to build your own sensor-to-pc interface, I think using
> > a microchip PIC microcontroller (on serial port, on a MIDI port, or the
> > USB-series) for analog inputs is a more elegant solution. It requires the
> > use of a programmer once though, but those are not expensive either. It is
> > less components, less handwork, less CPU cycles wasted on polling, and
> > more resolution. Have a look at www.ucapps.de for a well-documented and
> > free design.
> >
> > I started messing with those chips a couple of months ago, and I'm pleased
> > with them. I've programmed them for analog-to-midi, as a 12-channel
> > infrared-light-barrier-controller and as multichannel pulse generator.
> >
> > regards,
> >  j#|@
> >
> > _______________________________________________
> > PD-list mailing list
> > PD-list at iem.at
> > http://iem.at/cgi-bin/mailman/listinfo/pd-list
> 
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