Lesson 8 of 16

Play a tune

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const int BUZZER = 8; int melody[] = { 262, 262, 392, 392, 440, 440, 392, 349, 349, 330, 330, 294, 294, 262 }; const int N = sizeof(melody) / sizeof(int); // how many notes are in the list void setup() {} void loop() { for (int i = 0; i < N; i++) { tone(BUZZER, melody[i], 220); delay(220 + 50); // a short gap so repeated notes sound separate } delay(1000); }

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tone() makes a square wave at any frequency on any pin. Put a piezo buzzer on D8, give it a list of notes, and it plays a tune.

Pick a tune and hear it
Why every note in an octave doubles
Write your own melody

Pin	Connects to	What it does
`D8`	The buzzer's + leg	tone() drives it with a square wave.
`GND`	The buzzer's − leg	Ground.

Wire it in

Sensors and actuators this board drives, with the real connections.

Piezo buzzerSupply 5 V
+ to a pin, − to GND. tone(pin, frequency) plays a note; a piezo draws only a few mA, so no resistor is needed.
Part pin Board pin
POS D8Wire colour orange
NEG GNDWire colour black

Part pin	Board pin
POS	D8Wire colour orange
NEG	GNDWire colour black

All 16 parts on the Arduino Uno R3 page

Play a tune

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in

Play a tune

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in