[PD] Sensors

Chris McCormick chris at mccormick.cx
Fri Oct 31 14:25:34 CET 2003


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).



On Thu, Oct 30, 2003 at 07:22:07PM -0700, 0 wrote:
> I was wondering if any of you could recommend sources for sensor fabrication. I'm interested in building my own sensors for use in performances w/ computer interface. I'd love advice about books to read, websites, or even where to start (i.e. do I need to be an electrician first). Thanks,
> -i
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chris at mccormick.cx

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