Freenove ESP32 User Manual

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97
Chapter 8 Buzzer
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playMelody(tuneCamDis, beatCamDis, 100);
break;
case MELODY_CAM_FAILURE:
playMelody(tuneCamFailure, beatCamFailure, 500);
break;
case MELODY_BEEP_1:
playMelody(tuneBeep1, beatBeep1, 300);
break;
case MELODY_BEEP_2:
playMelody(tuneBeep2, beatBeep2, 100);
break;
case MELODY_DHTG:
playMelody(tuneDhtg, beatDhtg, 500);
case MELODY_BB_CLEAR_1:
playMelody(tuneBb1, beatBb1, 100);
break;
case MELODY_BB_CLEAR_2:
playMelody(tuneBb2, beatBb2, 100);
break;
default:
break;
}
}
vTaskDelete(xTaskGetCurrentTaskHandle());
}
Define the pin for the buzzer. ESP32's PWM channel, number of bits, and frequency.
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#define BUZZER_PIN (33)
#define BUZZER_CHN (0)
#define BUZZER_BIT (10)
#define BUZZER_FREQ (5000)
Configure the pin to control the buzzer:
1. Configure the PWM channel, frequency, and number of digits.
2. Associate the PWM signal output channel with the pin that controls the buzzer.
3. Control the duty cycle of the PWM channel to 0.
4. Control the buzzer to make no sound.
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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);
}
Call setBuzzer() to control the buzzer to emit sounds with different frequencies.
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void setBuzzer(uint16_t freq) {
if (freq != 0) {

Freenove ESP32 Specifications

General

Brand	Freenove
Model	ESP32
Category	Computer Hardware
Language	English