Re: [Discuss-gnuradio] Timer & Button in GRC

[Josh Blum]

On 05/01/2010 06:48 PM, William Pretty Security Inc wrote:
> Two Questions:
>
>
>
> 1)      GRC comes with a slider but no command button (like the one with
> usrp_probe). Is there an easy way to add one to GRC ?

The variable chooser implements a button.

> Do I have to add one afterward using a python editor ??

As a general rule, do not edit a generated file. You can always create 
custom python modules or blocks and import them into grc.

>         2)     Is there any way to implement a timer event with GRC ?  I want
> to step the "frequency" variable in USRP Source and the "baseband frequency"
> variable in
>
>                  FFT Sink at say two second intervals to simulate a scanner .
>
>
>
>    Or is there a better way to d number 2 ???

I would use the signal source to generate a triangle wave, and connect 
that to a variable sink. Where the variable controls the frequency of 
the usrp source.

-Josh