32 lines
696 B
Arduino
32 lines
696 B
Arduino
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#define PIN_BUZZER_SWITCH 14
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#define PIN_BUTTON 21
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#define PWM_CHANNEL 0
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void setup() {
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pinMode(PIN_BUZZER_SWITCH, OUTPUT);
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pinMode(PIN_BUTTON, INPUT);
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// Tutorial had a bug here. Needs to be freq=1000, not freq=1.
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ledcAttachChannel(PIN_BUZZER_SWITCH, 1000, 10, PWM_CHANNEL);
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ledcWriteTone(PIN_BUZZER_SWITCH, 2000);
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delay(300);
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}
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void alarm() {
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float sine;
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int tone;
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for ( int i = 0; i < 360 ; i += 10 ) {
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sine = sin(i * (PI / 180));
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tone = 2000 + sine * 500;
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ledcWriteTone(PIN_BUZZER_SWITCH, tone);
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delay(50);
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}
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}
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void loop() {
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if ( digitalRead(PIN_BUTTON) == LOW ) {
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alarm();
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} else {
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ledcWriteTone(PIN_BUZZER_SWITCH, 0);
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}
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}
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