![]() ![]() Instead we use the Arduino tone function to generate a square wave of the specified frequency (and 50% duty cycle). Therefore we can not use the analog write function, because this function has a fixed frequency of 500Hz. To create a melody the passive buzzer needs an AC signal where we can define the frequency. Let me know in the comment section if you know the melody that we create in this example. The passive buzzer has the advantage that we can not only create a tone, but also a melody with different frequencies. The digital I/O pin of the Arduino, EPS8266 or ESP32 microcontroller is therefore connected to the gate of the MOSFET with a resistor of 220Ω in series, because the Arduino operation voltage of 5V or even the 3.3V operation voltage of the ESP8266 or ESP32 would damage the transistor. Otherwise we were not able to switch off a load that has a higher voltage than the control voltage. Low-side switch: The transistor is on the low (ground) side of the circuit and the buzzer is connected on the high (5V or 3.3V) side.NPN transistor: Because we want to turn the active or passive buzzer on by setting the digital pin of the microcontroller HIGH.In my case I use the IRLZ44 NPN MOSFET as low-side transistor to control the buzzer. The solution is to use a transistor and divide between the control signal and the power consumption. But if we want to use magnetic buzzers with a current consumption higher than 20mA we have to find a different power supply than the digital I/O pin of the microcontroller. Piezo buzzer have a current consumption lower than 20mA and could therefore be powered by Arduino microcontroller as well as the ESP32. ![]()
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