Post by thread:Piezo Transducer

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......!

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 --------------------------------------------------------------------- Andrew M Errington Tel: +44 1524 593678 Microcomputer Consultant Fax: +44 1524 844011 Lancaster University spam_OUTa.erringtonTakeThisOuTlancaster.ac.uk Lancaster LA1 4YW www.lancs.ac.uk/people/cpaame/cpaame.htm --------------------------------------------------------------------- >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.

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. -()---()---()---()---()---()---()---()---()---()---()---()---()---()---()- Rolan Yang http://hertz.njit.edu/~rxy5310 Electrical Engineer .....rxy5310KILLspam@spam@hertz.njit.edu kyuriusKILLspamtsb.weschke.com VR,ROBOTICS,FENCING,HACKING,INDUSTRIAL MUSIC,ART,EXPLOSIVES,INLINE SKATING THESE ARE A FEW OF MY FAVORITE THINGS. -()---()---()---()---()---()-----()-()---()---()---()---()---()---()---()- 4 out of 10 people are annoyed by ^ this.