[PD] Re: [PD-announce] PWM in Pd
Hans-Christoph Steiner
hans at eds.org
Fri May 26 22:28:33 CEST 2006
On May 26, 2006, at 5:33 PM, Martin Peach wrote:
> Hans-Christoph Steiner wrote:
>> I just realized the answer to my question about getting positive-
>> only voltages from the sound card. The DC filters will probably
>> remove the DC offset, therefore, the output voltage on a PWM
>> signal will also be centered again on 0, and therefore swing from
>> negative to positive. I do remember getting some very low
>> frequencies out of a computer when testing speakers. But I
>> haven't actually tested this [pwm~] object for electronics. But
>> it would be nice to have a very well implemented [pwm~], so its
>> great that this discussion happened.
>> I did use the [pwm] object with a MIDI-controlled relay box,
>> worked quite well at 30-60Hz on a biggish DC motor.
>
> But that sounds like you're sending MIDI messages at a rate
> determined by the [pwm], so bandwidth is limited by MIDI to ~1kHz.
> Better to program your relay box to do pwm with the pulse width
> controlled by MIDI, instead of using MIDI just to turn the motor on
> and off.
Sometimes you make do with what you have in the amount of time you
have. I make no claims that this was a great solution. But it does
work.
.hc
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