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I want to use the buzzer KPEG2000 in my Arduino application. I would like to know if a GPIO can directly drive this buzzer, without destroy the uC (a GPIO can deliver 40 mA max). In the datasheet, we can find the current consumption under 12 volts (40 mA), but if I decrease the driving voltage to 5V, will this buzzer use more or less then 40 mA ?

https://docs-emea.rs-online.com/webdocs/07a8/0900766b807a8e16.pdf

I already tried to make this buzzer work on an Arduino, and it works. But I would like to know if plugging this buzzer directly to the Arduino will not destroy it.

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In the datasheet I read 14 mA @ 12V, which is below the recommended current of a GPIO pin of 20 mA.

Note that 40 mA for a GPIO pin is the max current, recommended is 20 mA. But 14 mA is way less.

To see if it changes for 5V, try connect it without an MCU (directly to a 5 V adapter/USB/breadboard power) and measure the current using a multimeter.

In case it uses more than 20 mA @ 5V, than use a transistor/mosfet to drive the buzzer.

In case you want to have the buzzer at full power, connect a VCC 5V power rail pin to a boost converter, which is controlled by a transistor/mosfet controlled by a GPIO pin.

Thus

Arduino VCC 5V -> Boos converter to 12 V -> Transistor/Mosfet -> Buzzer -> GND
                                                 ^
                                           Arduino GPIO pin
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    Point of clarification: You shouldn’t use a boost converter on a GPIO pin, only on a 5V supply rail. Boosting voltage takes a lot of current. >2.4x more. – Duncan C Jul 2 at 11:05
  • @Duncan Yes I meant that (after a transistor), I will make it more clear. – Michel Keijzers Jul 2 at 11:55
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    Yeah, I assumed that's what you meant, but remember that lots of newbies read these boards. – Duncan C Jul 2 at 12:11
  • @DuncanC True indeed, thanks for the notification. – Michel Keijzers Jul 2 at 12:16
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If this is a piezo buzzer they typically work over a wide range of voltages and use very little current. I've seen them with specs for an input voltage ranging from 3 to 18v.

You could likely drive a piezo buzzer directly from a GPIO line without problems.

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