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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Raik
@Gordon
There are so many different types of piezos ( https://www.reichelt.de/signalakustik-c6560.html?GROUPID=6560&GROUPID=6560&&nbc=1;SID=94XoiXrqwQATQAAHctp0w31e14953fa14751d233b694115518b39 )
Another one has an impedance of 1500 Ohm: https://cdn-reichelt.de/documents/datenblatt/B400/EKULIT-190023.pdf Would that be even better?