Freenove ESP32 - Page 97

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Chapter 8 Buzzer
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#define MELODY_DHTG 13
#define MELODY_BB_CLEAR_1 14
#define MELODY_BB_CLEAR_2 15
……
void setupBuzzer();
void setBuzzer(uint16_t freq);
void setMelodyToPlay(int m);
void task_Buzzered(void *pvParameters);
#endif
Buzzer.cpp
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#include "Buzzer.h"
#define BUZZER_PIN (33)
#define BUZZER_CHN (0)
#define BUZZER_BIT (10)
#define BUZZER_FREQ (5000)
int melody = -1;
void setupBuzzer() {
ledcSetup(BUZZER_CHN, BUZZER_FREQ, BUZZER_BIT); // setup pwm channel
ledcAttachPin(BUZZER_PIN, BUZZER_CHN);
ledcWrite(BUZZER_CHN, 0);
ledcWriteTone(BUZZER_CHN, 0);
}
void setBuzzer(uint16_t freq) {
if (freq != 0) {
ledcWrite(BUZZER_CHN, 512);
ledcWriteTone(BUZZER_CHN, freq);
} else {
ledcWrite(BUZZER_CHN, 0);
ledcWriteTone(BUZZER_CHN, 0);
}
}
template<int N> //Non-type template parameters
void playMelody(const int (&tune)[N], const float (&beat)[N], float speed) {
for (int i = 0; i < N; i++) {
setBuzzer(tune[i]);
delay(beat[i] * speed);
setBuzzer(0);