Buzzer
This piezo buzzer has built in circuitry that produces audible buzzer tone. It has just two wires, a line in and Ground.
Even melody can be achieved with proper notes.
Circuit
| Arduino | Sensor |
| Pin 6 | RED Wire |
| GND | BLACK Wire |
Code
void setup() {
}
void loop() {
// play a note on pin 6 for 200 ms:
tone(6, 440, 200);
delay(200);
// turn off tone function for pin 6:
noTone(6);
delay(300);
}