Acrob005
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Make Music
Speaker is a small electronic device which can make sounds if appropriate driven. Lets connect the speaker to the Arduino pin D4 (see schematic diagram and connection diagram below) and program it to make few tones.
![](/sensorwiki/images/6/6d/ArduinoSpeaker.png)
#define SPEAKER 4 // Piezospeaker connected to pin 4
void setup()
{
// Example 1: tone of specified frequency and duration
tone(SPEAKER, 4000, 1000); // 4kHz, 1 sec.
delay(500); //small pause
tone(SPEAKER, 3000); // 2kHz, forever
delay(1000);
noTone(SPEAKER); // turn off sound.
}
void loop()
{
/* do nothing */
}
For more details about the tone command see the Reference
How it works
Why robot needs to play music?
Advanced example
Following example shows more sound effects. It comes from the http://www.arduino.cc/en/Tutorial/Melody with just one minor (but important) change: the pinnumber is 4, not 9.
#define SPEAKER_Pin 4
int length = 15; // the number of notes
char notes[] = "ccggaagffeeddc "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 300;
void playTone(int tone, int duration)
{
for (long i = 0; i < duration * 1000L; i += tone * 2)
{
digitalWrite(SPEAKER_Pin, HIGH);
delayMicroseconds(tone);
digitalWrite(SPEAKER_Pin, LOW);
delayMicroseconds(tone);
}
}
void playNote(char note, int duration)
{
char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
// play the tone corresponding to the note name
for (int i = 0; i < 8; i++) {
if (names[i] == note) {
playTone(tones[i], duration);
}
}
}
void setup()
{
pinMode(SPEAKER_Pin, OUTPUT);
}
void loop()
{
for (int i = 0; i < length; i++) {
if (notes[i] == ' ') {
delay(beats[i] * tempo); // rest
} else {
playNote(notes[i], beats[i] * tempo);
}
// pause between notes
delay(tempo / 2);
}
}
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