Play Tune on Piezo Buzzer Using PWM

RE: Play Tune on Piezo Buzzer Using PWM

JONATHAN LL — Fri, 13 Oct 2023 13:55:04 GMT

Sorry Anil, but this is what we currently have, there will be no new updates for the nRF5 SDK in terms of PWM examples. I would recommend to change to the nRF Connect SDK as this is our current focus.

But the nRF5 SDK should do the job and if you follow the recommendations form hmolesworth as well it would get you quite far.

Regards,
Jonathan

RE: Play Tune on Piezo Buzzer Using PWM

Anil Rathod — Thu, 12 Oct 2023 07:29:14 GMT

I appreciate your guidance, Jonathan.

I mention earlier I have already explored SDK PWM Library example pwm_library. Using that I am able to generate beep sound and i have also try to changing duty cycle but I didn't get expected output, According to PWM principles, it should alter the intensity of the Piezo Buzzer, but the output didn't meet my requirements.

I also examined your microbit piano demo example. It's looking same, but unfortunately, it doesn't align with the nRF52832 Development Board (Devlop code into Segger Embedded Studio). Additionally, it utilizes more than one GPIO pin for generating different frequencies, contrary to my project's specification where I need to achieve this using just one GPIO pin using PWM.

Mention above I have refer Arduino Project : https://github.com/giacomocerquone/arduino-projects/blob/master/arduino-jingle-bells/arduino-jingle-bells.ino

that successfully generate various frequencies using PWM on a single GPIO pin & also it's create specific rhythms or tunes, precisely what I need for my application.

I regret to inform you that, I have found similar queries which raise in this forum dating back 7 to 8 years and 4 to 5 years but still viable solutions not available.

Regards,
Anil Rathod

RE: Play Tune on Piezo Buzzer Using PWM

hmolesworth — Wed, 11 Oct 2023 16:20:44 GMT

Not sure if this code helps, but worth a look nrf52-pwm-wav-sbc-decoder-player

RE: Play Tune on Piezo Buzzer Using PWM

JONATHAN LL — Wed, 11 Oct 2023 11:57:16 GMT

We do have some examples from the SDK that might be helpful but not much else of example for making music with a buzzer.

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/pwm_example.html?cp=9_1_4_6_25

There is a microbit example for a piano demo : https://www.youtube.com/watch?v=ulKq5To9dmA (its voiced in Norwegian, but can have English text) It links to a Git repo with the example. https://github.com/ProsjektMicroBit/08_Piano

They use a speaker in the demo and not a buzzer.

Regards,
Jonathan

RE: Play Tune on Piezo Buzzer Using PWM

Anil Rathod — Wed, 11 Oct 2023 09:30:39 GMT

Thanks for the quick reply Hmolesworth

I have already seen this link before but sorry it was really not helpful for me. I need to simply integrate PWM peripheral task not an over BLE.

Can you please posting any simple example for playing a tune using PWM ? This would be really very helpful to understanding the full setup for changing multiple frequency using PWM and playing tune.

RE: Play Tune on Piezo Buzzer Using PWM

hmolesworth — Tue, 10 Oct 2023 16:00:28 GMT

Try these links, they might be of use:

simple_playback

nrf52-midi-piano

midi-over-bluetooth-le