What is an Arudino buzzer? An arduino buzzer is also called a piezo buzzer. It is basically a tiny speaker that you can connect directly to an Arduino. You can generet sound a tone using frequency you set. Most buzzer produces the same noisy sound from about frenqurency range of 2 to 4 kHz. To not damage our arduino, use a resistor 100Ω and connect to pin 3.