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?