I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used ...

It’s an electronic device commonly used to produce and signaling a procces that is happening through a sound, beep or etc. The Piezo buzzer produces sound through electricity. Some uses of Piezo ...

Figure an Arduino most matches the "Other" category. 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 ...