![]() This module is similar to or the same as the KY-012.Sample inspected and tested per incoming shipment.BEFORE THEY ARE SHIPPED, THESE MODULES ARE: If the buzzer still has the protective paper on it, be sure to remove it for the buzzer to operate correctly. The buzzers are polarized, so check which terminal is positive and which terminal is negative before connecting it to a battery. An easy way to tell active and passive buzzers apart is by connecting them to a DC voltage source like a 9 volt battery. These modules are useful for adding basic audible signaling to a project. Passive buzzers need an AC voltage to produce sound. S = Signal input, connects to digital output pin on MCU.Note that one some modules, the pins may be in reverse order from the picture shown, so go by the markings on the module. Here is a sound clip where it is being toggled on/off every second. It is moderately loud at about 85dB with a 2.3 kHz frequency, so it is best suited for use as an attention getting alarm or beeper. If a lower volume is desired, a small value resistor can be put in series. If driving it using a MCU output pin, it can be driven directly from the pin, though it is recommended to not draw more than 20mA for extended periods of time. The buzzer will draw about 25mA from the S pin. The advantage of a passive buzzer is that the tone and loudness of the buzzer can be controlled by the frequency and drive power of the waveform that is used to drive it but it is more difficult to use. Passive buzzers are more similar in function to a small speaker and need to be driven by a waveform with enough drive current capability to create the desired sound. ![]() These are mainly useful for signaling or an alarm. ![]() Though simple to use, the downside of the active buzzer is that the tone of the buzzer is fixed at a particular frequency and the loudness is more or less fixed. There are two types of buzzers, Active buzzers such as this one and passive buzzers.Īctive buzzers have the drive circuitry built into them, so a simple active HIGH logic level signal will activate the buzzer. The Buzzer Active 5V Module is an active piezo buzzer module useful for creating sound in a project. ![]()
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