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anyone got piezo beep beep code snippet 12f629 4 MHz clock?

 
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Alyn P.



Joined: 01 Aug 2011
Posts: 5
Location: U.K.

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anyone got piezo beep beep code snippet 12f629 4 MHz clock?
PostPosted: Fri Aug 05, 2011 5:34 am     Reply with quote
Hi,

Is there anyone who could help with giving me a short beep beep code to drive a little piezo transducer- its driving me mad! I realise it will probably need a transistor amp. Any help would be gratefully received.

I have tried devising one myself, but I concede defeat, mid-tone kind of beep beep would be fantastic. I will use it for diagnostic purposes.
Thank you.
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Al
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Aug 05, 2011 1:06 pm     Reply with quote
This code will produce an approximately 1 KHz tone from the piezo buzzer
on the PicDem2 Plus board. You must have jumper J9 installed (this
connects pin C2 to the piezo buzzer).
Code:

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)

//==========================================
void main()
{

while(1)
  {
   output_high(PIN_C2);
   delay_us(500);
   output_low(PIN_C2);
   delay_us(500);
  }

}


The transistor driver circuit for the piezo buzzer is shown in the middle-
left side of this schematic:
http://ww1.microchip.com/downloads/en/DeviceDoc/PICDEM%202%20Plus%20RoHS.pdf
Alyn P.



Joined: 01 Aug 2011
Posts: 5
Location: U.K.

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PostPosted: Mon Aug 08, 2011 2:26 am     Reply with quote
Super, thank you very much. That's twice now you have helped out- a few beers for you if I could. Anyway, again its much appreciated.
Al Very Happy
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Al
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