Piezo alarms

[last updated: 2020-10-08]
go to: Sonalerts & screamers
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• Adafruit PID:160
  
  
  

  piezo Buzzer (Adafruit: 160)

  drive with square wave, 2-10 khz
  loudest at 4khz
  3-30v peak-to-peak

  "For extra loudness, you can connect both pins to a microcontroller and swap which pin is high or low ('differential drive') for double the volume."

  my comment: how will this do anything without having +V & -V supplies??
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  powered from arduino nano digital output at 5v, 50% duty cycle, 1ms on 1ms off, could hear it, but very low volume and very high pitch.

  may later try powering it from 12v or higher to get more volume.
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eof