Active and Passive Buzzer for Arduino, ESP8266 and ESP32 In this tutorial you learn how active and passive buzzer work and the differences between both buzzers. After we create a full circuit along with a NPN MOSFET and flyback diode and Arduino, ESP8266 or ESP32 microcontroller, we program a sound example for the active buzzer … Continue reading Active and Passive Buzzer for Arduino, ESP8266 and ESP32