To be specific, it isn't an Arduino brand, it is a DigiSpark, but the trouble isn't with the device itself. The problem is with a buzzer. I got the Velleman svm06. It says it is rated at 3-7VDC ...

The humble piezo disc buzzer is much more than something that ... Using a voltage controlled amplifier working on a noise source. The result is recognizably the drum sound, entirely in electronics.

the detector would trigger off its own LEDs and buzzer, trapping itself in a never-ending loop. [Mirko] solved this by encasing the Arduino inside a closed, grounded metal box with only the ...