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Picedem2 plus and buzzer

 
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Agios



Joined: 28 Jan 2006
Posts: 8
Location: Brighton

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Picedem2 plus and buzzer
PostPosted: Mon Feb 27, 2006 5:24 am     Reply with quote
Hi everyone,

A question which some of you might find it very simple to answer. I am currently playing with my picdem2 peripherals and what I want is to operate the buzzer for 2seconds and then turn it off. I HAVE jumper 9 connected and all I can hear when RC2 goes high is a !click! and after 2 seconds another !click!. Am I doing something wrong?? Given the circuitry in picdem2 all it is required is just a logic1(5V) of logic0(0V) to operate the buzzer. Any suggestions will be really helpfull!!
OOOOHH and something else... I know that some of you get really ungry when they see dealy_ms() function, can someone suggest an easy way of using PIC timers for simple delays; (From μsecs to secs).

Awaiting suggestions

Agios

Code:

void main (void){

   lcd_init();
   printf(lcd_putc,"Hi  ");
      lcd_gotoxy(1,2);
      printf(lcd_putc,"There");
   output_bit( PIN_C2, 1);
   delay_ms(2000);
   output_bit( PIN_C2, 0);

while(1);


}

Paolino



Joined: 19 Jan 2004
Posts: 42

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PostPosted: Mon Feb 27, 2006 7:09 am     Reply with quote
It seems that the buzzer must be driven with a PWM signal, since it has not an internal oscillator itself. I do not have right now the schematich of PICEDEM 2 PLUS, but I seem to remeber that the buzzer is connected (via J9) to CCP/PWM ports of the sockets.
I suggest you to setup the desired PWM and drive it to the buzzer.

Best regards.

Paolo.
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Mon Feb 27, 2006 9:22 am     Reply with quote
In the code library is some picdem2 buzzer code that plays chrismas tunes.

It could get you started.
http://www.ccsinfo.com/forum/viewtopic.php?t=22010&highlight=music
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