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Wireless Doorbell

Press a button, play a tune on a buzzer.

beginner20 min

Components Needed

Arduino UNO

Push button

Passive buzzer

10kΩ resistor

Circuit Diagram & Wiring

Add your circuit diagram image here.

Button between pin 2 and GND (use INPUT_PULLUP).
Buzzer + → pin 8, − → GND.

Arduino Sketch (.ino)

doorbell.ino

int notes[] = {<span style="color:#79b8ff">523span>, <span style="color:#79b8ff">659span>, <span style="color:#79b8ff">784span>, <span style="color:#79b8ff">1047span>};

void setup() {
  pinMode(<span style="color:#79b8ff">2span>, INPUT_PULLUP);
  pinMode(<span style="color:#79b8ff">8span>, OUTPUT);
}

void loop() {
  if (digitalRead(<span style="color:#79b8ff">2span>) == LOW) {
    for (int i = <span style="color:#79b8ff">0span>; i &lt; <span style="color:#79b8ff">4span>; i++) {
      tone(<span style="color:#79b8ff">8span>, notes[i], <span style="color:#79b8ff">200span>);
      delay(<span style="color:#79b8ff">220span>);
    }
    noTone(<span style="color:#79b8ff">8span>);
    delay(<span style="color:#79b8ff">300span>);
  }
}