This module is easy to use, just need to send high or low signal from the controller GPIO, whenever the IN pin is low, the buzzer will turn on and the onboard led will turn on as well. Its application includes audible and visual alarm.
It can be used in following ways:
Active buzzer: when the power is on, the input triggering signal is low, the buzzer can sound (continuous sound)
Passive buzzer: The triggering signal must be of certain frequency to play the sound in different tones.
||Operating < 20ma; output <30ma
||+ - DO(Digital quantity) AO(Analog quantity)