I have connected an active piezo buzzer to my arduino: KY-012 Active buzzer module.

I was a bit surprised that it drew like ~10mA on the signal pin from my nodemcu, which I find a bit weird, since the signal generator itself is powered separately. Even if 10mA is in spec of the GPIO pins I wonder if that much current is considered a normal amount to expect.

The module draws an additional ~10mA from the power supply line.

Has probably someone the possibility to provide comparable measurements?

  • For what it's worth: arduinomodules.info/ky-012-active-buzzer-module ... it has 3 pins, but the middle pin is not even connected and the max current is 30 mA (which is within absolute max current limits of an Arduino GPIO but not 'recommended'. May 4 '19 at 18:07
  • The middle pin must be connected somehow. It draws a current, when the S pin is connected to VCC. But it is correct, that even when unconnected, the module produces a sound.... weird. May 4 '19 at 21:23

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