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| − | == Specification ==
| + | #redirect [[category: Buzzer]] |
| − | <gallery>
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| − | File:Mini_Buzzer_9042_02.jpg | 9042 specification
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| − | File:Mini_Buzzer_9042_04.jpg | 9042 pins
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| − | </gallery>
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| − | == Passive buzzer ==
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| − | | |
| − | Passive buzzers don’t do anything themselves – the software needs to generate a waveform for any sound it wants to make. This example code uses PWM timings to play different notes – your buzzer should be connected to pin 9. Alternatively, take a look at the tone() function.
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| − | | |
| − | <syntaxhighlight lang="arduino">
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| − | | |
| − | /* Play Melody
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| − | * -----------
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| − | *
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| − | * Program to play melodies stored in an array, it requires to know
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| − | * about timing issues and about how to play tones.
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| − | *
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| − | * The calculation of the tones is made following the mathematical
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| − | * operation:
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| − | *
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| − | * timeHigh = 1/(2 * toneFrequency) = period / 2
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| − | *
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| − | * where the different tones are described as in the table:
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| − | *
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| − | * note frequency period PW (timeHigh)
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| − | * c 261 Hz 3830 1915
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| − | * d 294 Hz 3400 1700
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| − | * e 329 Hz 3038 1519
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| − | * f 349 Hz 2864 1432
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| − | * g 392 Hz 2550 1275
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| − | * a 440 Hz 2272 1136
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| − | * b 493 Hz 2028 1014
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| − | * C 523 Hz 1912 956
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| − | *
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| − | * (cleft) 2005 D. Cuartielles for K3
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| − | */
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| − | | |
| − | int ledPin = 13;
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| − | int speakerOut = 9;
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| − | byte names[] = {'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'};
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| − | int tones[] = {1915, 1700, 1519, 1432, 1275, 1136, 1014, 956};
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| − | byte melody[] = "2d2a1f2c2d2a2d2c2f2d2a2c2d2a1f2c2d2a2a2g2p8p8p8p";
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| − | // count length: 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
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| − | // 10 20 30
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| − | int count = 0;
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| − | int count2 = 0;
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| − | int count3 = 0;
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| − | int MAX_COUNT = 24;
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| − | int statePin = LOW;
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| − | | |
| − | void setup() {
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| − | pinMode(ledPin, OUTPUT);
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| − | }
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| − | | |
| − | void loop() {
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| − | analogWrite(speakerOut, 0);
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| − | for (count = 0; count < MAX_COUNT; count++) {
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| − | statePin = !statePin;
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| − | digitalWrite(ledPin, statePin);
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| − | for (count3 = 0; count3 <= (melody[count*2] - 48) * 30; count3++) {
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| − | for (count2=0;count2<8;count2++) {
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| − | if (names[count2] == melody[count*2 + 1]) {
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| − | analogWrite(speakerOut,500);
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| − | delayMicroseconds(tones[count2]);
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| − | analogWrite(speakerOut, 0);
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| − | delayMicroseconds(tones[count2]);
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| − | }
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| − | if (melody[count*2 + 1] == 'p') {
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| − | // make a pause of a certain size
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| − | analogWrite(speakerOut, 0);
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| − | delayMicroseconds(500);
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| − | }
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| − | }
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| − | }
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| − | }
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| − | }
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| − | </syntaxhighlight>
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| − | [[category:Sound, light, etc]] | |
