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#1 2010-06-30 04:03:49

Zard
New member

HELP : setting an analog signal

I guess pin 9 - 12 are for analog output.
How do I go about setting an output?
say if I want a 1Volt output on pin 10... how do I do that?

Thanks
Zard

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#2 2010-07-01 02:26:21

Zard
New member

Re: HELP : setting an analog signal

I guess there is no way of doing this...  So please ignore the previous message.

On the 2nd note...   It would be nice if we have a bit more examples and applications.

One good application to have is to make my uCham into an oscilloscope / spectrum analyzer.

For the variable voltage -- I guess I could use pin 9 to output a frequency dependent output then use a frequency->voltage converter to get the voltage I want.  Have anyone tried that?

Thanks...

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#3 2010-07-09 11:50:53

gremlinc5
Member

Re: HELP : setting an analog signal

Hi Zard...

I had explained that in another post.

You must generate at those port a PWM signal and put it into an RC circuit.

Use a 30 Hz RC filter and a 30 KHz PWM signal. You will have an analog output related to the PWM duty cycle.

Look at this:
http://www.ontrak.net/pwm.htm

Or search in google for "pwm to analog" for more outcome.

Seeya


ST7FLite39 daughter board
REva 2.10
RLink 3.4
"uChameleon" as: SPI Master for debug, Analog output for sensing emulation

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