pwm response

steprog

Hi Guys,
I was wondering do any of you guys know how fast I can pump a sine wave out of the prop.· Im building a system that needs a frequency response on the order of 1 khz.· Im hoping to use the pwm and smoothing filters in order to do this. A penny for your thoughts.
·

Christof Eb.

Hi,

yes 1kHz sine wave can be done.

But the methods to do it depend for example from the needed resolution/quality of the sinwave.

I personally would tend to use PropBasic. In my "ProprSound" Project there is a sine generator task hidden, that I used for tests.

http://forums.parallax.com/showthread.php?p=893799

I·used it with 1kHz for example. Only a simple RC- filter is used.

You could use a resistor ladder as·DAC too. Then you need not much software.

Good luck,

Christof

steprog

Thanks for the reply.

I really don't want to switch gears and learn new software, but I think your right.· I have been struggling through the counter docs.· I'll see how it goes.

Thanks,

Greg

CoronaKid

Greg,

Check out Drones excellent Sinewave code here:
http://forums.parallax.com/forums/default.aspx?f=25&m=442433

I too need sinewaves, and others have been helping me here:
http://forums.parallax.com/forums/default.aspx?f=25&m=441610

Fred

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