![]() Only one tone can be generated at a time. The pin can be connected to a piezo buzzer or another speaker to play tones. A duration can be specified, otherwise, the wave continues until a call to the Generates a square wave of the specified frequency (and 50% duty cycle) on a pin. We’ll be using it to set different output frequencies in the following code example in the next section. In software, we need to generate the AC signal required to drive the passive buzzer using the NoTone ( ) functions to control the passive buzzer device. Or, alternatively, we can use any digital IO pin alongside the We can use a PWM output pin to control the passive buzzer tone output. The Passive Buzzer connection to the Arduino is exactly the same as what we’ve done with the Active Buzzer. But it’s still a thing and I thought you should know about it and try it by yourself. It does indeed control the volume level of the buzzer but it also distorts the buzzer sound which is not meant to be connected to a PWM signal in the first place. Disconnect the voltage source and reconnect it again to hear the clicking sound again.
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