Buzzer Sound with Low-Power PWM Library

[Joseph Ayuk]

Hello,  I would like know if it is possible to play a buzzer using the Low-power PWM Library ? I am using the nrf51 DK and Softdevice130. The SDK I use is version SDK V 12.3

Joseph Ayuk

[awneil]

What do you mean, "play a buzzer" ?

If you just want a tone, you don't need PWM at all - just a timer.

[Joseph Ayuk]

I want to play a suitable melody on a speaker connected to my nrf51 dk. I am doubting if the PWM library will satisfy my needs. Is it possible to use a .wav file to play a melody on my speaker connected to the board ? Besides usng Low-power pwm library.

[awneil]

IIRC, the "Low-power PWM Library" does all its cycle-to-cycle updates in software - so is not suitable for constantly varying duty cycles like this.

I suggest looking at the 'PWM Driver' or 'PWM Library' examples instead

"The PWM Library Example demonstrates the use of the pulse-width modulation library by generating waveforms over a GPIO. The GPIO pin could drive a small speaker, for example"

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/pwm_example.html

[awneil]

Note that "buzzer" is usually taken to mean a device which internally generates its own tone - so you just apply power to it, and goes Buzzzzzzzzzz or Beeeeeeeeeeeep or whatever.

You don't want one of those!

What you need is usually called "speaker" (or, sometimes,  a "sounder")

[Joseph Ayuk]

Thanks for your reply awneil but can the PWM Driver or PWM Library play a suitable melody like maybe the Pirate of Carribean theme on my buzzer ? I really doubt that.