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PICList Thread
'Piezo Transducer'
1995\11\06@084554 by Kenny Baby

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I want to connect a Piezo-disk across two output pins of either a
pic84/pic71 and drive it directly by toggling the pins, ie pa0=1,pa1=0
pa0=0,pa1=1,,,pa0=1,pa1=0. can anbody see a problem with capacitance.
Would it be necessary to put a load resistor across the transducer..?
The 84/71 will be driven from a 2.5-3v psu.
Its function is to beep on a key press and use minimum power.
comercial dc units use more power than I have to spare.
,
,
,
,
,
,I've seen things you people wouldn't believe.
Attack ships on fire off the sholder of Orion.
I watched C-beams glitter in the darkness at Tan Hauser Gate.
All those moments will be lost in time,
like tears in rain.
Time to die.

Remember now, watch out for the Fairies......!

1995\11\06@134259 by Errington A

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I used a piezo tranducer between PA0 and GND on a PIC84 with no apparent
ill-effects.  I don't think you should have any problems with the transducer
between two pins.

Andy
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>I want to connect a Piezo-disk across two output pins of either a
>pic84/pic71 and drive it directly by toggling the pins, ie pa0=1,pa1=0
>pa0=0,pa1=1,,,pa0=1,pa1=0. can anbody see a problem with capacitance.
>Would it be necessary to put a load resistor across the transducer..?
>The 84/71 will be driven from a 2.5-3v psu.
>Its function is to beep on a key press and use minimum power.
>comercial dc units use more power than I have to spare.

1995\11\06@152121 by Rolan

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On Mon, 6 Nov 1995, Errington A wrote:

> I used a piezo tranducer between PA0 and GND on a PIC84 with no apparent
> ill-effects.  I don't think you should have any problems with the transducer
> between two pins.
>
> Andy

I'm working on a small project that uses the PIC as an ultrasonic
distance detector.  Instead of using a separate chip, I generated the
40kHz directly from the chip to the transducer (I also tried one with
a transistor amplifier).  The receiving end (using a 567 tone decoder) did
not seem to work very well. Has anyone attempted similar projects?
I need some hints on getting the receiver to work better.

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Rolan Yang            http://hertz.njit.edu/~rxy5310   Electrical Engineer
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