BoardPilotPiezo disc 27 mm with ESP32
Supply 3.3-5 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| + | Input (the ESP32 drives it) | D25 | Red wire. To a PWM-capable GPIO (ledc / tone). Quiet: a piezo needs a high voltage to be loud |
| - | Ground | GND | Black wire |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Starter code (Arduino)
void setup() { pinMode(25, OUTPUT); } // +
void loop() {
digitalWrite(25, HIGH);
delay(500);
digitalWrite(25, LOW);
delay(500);
}Sources
- Murata piezoelectric sounder (7BB-27-4) datasheet, Resonant frequency about 4.6 kHz
- Espressif ESP-IDF Programming Guide, LEDC (LED PWM controller)
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.