AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Graham Davies" <YahooGroups@e...> 
wrote:

> I think we should start this thread again.  I don't have much to 
> suggest except to say that the piezo buzzers I bought from All 
> Electronics are too loud and I leave the tape over the hole!
> 
> Is the OP sure that both systems are running from the same supply 
> voltage? Does he have a voltmeter to measure the voltage across 
the 
> buzzer when it is on?
> 
> Graham.

Hi, I am the OP.  As you may have seen, I figured out what the 
problem was.  It was ME.  I wrote the initialization function (to 
make the pin for OUTPUT).  But, I forgot to call the init.

Stupid error.

But, yes, the systems both are running off 5v.  I did check the 
buzzer on the raw 5v and it was normally loud.  I got it to work on 
properly once I turned the pin from "input-pullup" to "output".

Yes those things are LOUD!  Just the thing I want since the buzzer 
will be buried down in the guts of the box, and there may be some 
significant ambient external noise.

-Tony