Driving Piezo speaker (Buzzer)

sagacr2018 over 5 years ago

Can I drive a Piezo Speaker using Avnet Sphere Kit ? I tried to connect to PWM_0 of Kit and tried to convert Arduino Code to Avnet but failed. Arduino use internal timer to send Analog Signals but I am not able to figure out how to use Timer on Avnet Kit.

Have anyone done it ?

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bwilless over 5 years ago +1

Hi Rohit, There is an example here: https://github.com/Azure/azure-sphere-samples/tree/master/Samples/PWM/PWM_HighLevelApp that shows hw to drive a PWM signal. It looks like the example varies the intensity…
Sean_Miller over 5 years ago +1

The PWM example Brian mentioned should get you going. Before the hardware had PWM going a few months ago, I did a software based PWM for my piezo leveraging some Arduino code. With the piezo buzzer I was…

danzima over 5 years ago

peterfenn
bwilless

Any insights about the above?
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bwilless over 5 years ago

Hi Rohit,

There is an example here: https://github.com/Azure/azure-sphere-samples/tree/master/Samples/PWM/PWM_HighLevelApp that shows hw to drive a PWM signal. It looks like the example varies the intensity of an LED. This example should have all the details you need to get your piezo speaker working.

Brian
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Sean_Miller over 5 years ago

The PWM example Brian mentioned should get you going.

Before the hardware had PWM going a few months ago, I did a software based PWM for my piezo leveraging some Arduino code. With the piezo buzzer I was using, I found that setting the period and duty parameters took trial and error to first get a tone and then to get what I considered a good tone.

So, if it doesn't give you want you want, you may want to do a For...Loop that increments through the period values and outputs a number to the console. Then listen for what you like.

For example, for my piezo, to get a chirp , I had 400000 (period), 40000 (active).

See ya',
Sean
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sagacr2018 over 5 years ago in reply to bwilless

Thanks Brian. It'll help.
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sagacr2018 over 5 years ago in reply to Sean_Miller

Hey Sean,

I got your point. I'll run a for loop for different combinations to see outcome. It'll need earbuds though
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