AVR-Chat

Hi all,

Im try to read a PWM signal and do something if the PWM signal is 
correct,I have five diferent PWM signals and I wat to do something with 
each signal, Does anyone know How to do this? 

Thanks for help

On Fri, 2005-10-21 at 06:19 +0000, jdelgadillo66 wrote:
> Im try to read a PWM signal and do something if the PWM signal is 
> correct,I have five diferent PWM signals and I wat to do something
> with each signal, Does anyone know How to do this? 

   Please explain a little more about what it is you are actually
attempting to do.

   In so far as "reading" a PWM signal is concerned, all you need to do
is attach an input pin the to PWM line.  An optical isolator for spike
suppression, and a low pass filter for noise rejection would probably be
a good idea.

   Depending on the carrier frequency of the PWM signal, processing all
5 signald may be doable on a single AVR, but that doesn't seem highly
likely, as most useful PWM syustems use carriers of high enough
frequency to limit that.

Tom

--- In AVR-Chat@yahoogroups.com, Thomas Keller <tkeller1@n...> wrote:
>
> On Fri, 2005-10-21 at 06:19 +0000, jdelgadillo66 wrote:
> > Im try to read a PWM signal and do something if the PWM signal is 
> > correct,I have five diferent PWM signals and I wat to do something
> > with each signal, Does anyone know How to do this? 
> 
>    Please explain a little more about what it is you are actually
> attempting to do.
> 
>    In so far as "reading" a PWM signal is concerned, all you need 
to do
> is attach an input pin the to PWM line.  An optical isolator for 
spike
> suppression, and a low pass filter for noise rejection would 
probably be
> a good idea.
> 
>    Depending on the carrier frequency of the PWM signal, processing 
all
> 5 signald may be doable on a single AVR, but that doesn't seem 
highly
> likely, as most useful PWM syustems use carriers of high enough
> frequency to limit that.
> 
> Tom
>

Im try to explain better, I have a rf modules, tx and rx, the tx have 
four diferents signals (same frecuency and 5v), the side rx decode de 
signals and I can see on osciloscope de signal, the diference is the 
duty cyle, so I think that the PWM is the better option. I need the 
microcontroler learn the code, when someone push the rx buton the 
microcontroller recognize the code and do something, like cars alarms 
works.


Any idea?

Thanks to all.

Jaime