When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...

Finger-powered wireless piezo switch Swiss company Algra is developing a finger-powered piezo wireless push button, aiming it at stick-on light switches and other building control applications. The ...

While we normally see piezo elements being used to output audio, [Veedo] thought that they could be used in a more useful manner. He bought way too many piezo film tabs and decided to use them to b… ...