How can i connect electret microphone and receive information with nucleo-h743zi

[rubenles]

Hi,

I am not a pro user of using stm32 microcontrollers and i need to know if it is possible to connect an electret microphone with a stm32 nucleo h743zi board and see any information i receive with this component.

For example, i want to connect the condenser mic with nucleo board and see in my screen any data, or something to prove that i am connecting this correctly or know how to treat with these type of components.

This photo shows the type of condenser microphone i am using.

Sorry if i am not explaining it so well because i don't know if it is possible to do things like i am asking here.

Thank you so much for your time.

[LCE]

Yes, you can do that.

BUT...

1) Audio signal quality will be much worse than nowadays audio standard, due to the STM's 12-bit SAR ADC (or 16-bit?).

2) it's a loooong and hard way from having the components to actually getting any usable data to your PC.
Depending on your knowledge / skill level, this can take from 2 weeks (HW & STM pro with USB knowledge) up to several months.

3) Something many people forget: you need some software on the PC side as well.

[rubenles]

Thanks for answering,

> 1) Audio signal quality will be much worse than nowadays audio standard, due to the STM's 12-bit SAR ADC (or 16-bit?).

That's not a problem because in a future i will use other PCM4220PFBG4 (Audio converter) to fix quality. But first i want to know how to do simple things...

> 2) it's a loooong and hard way from having the components to actually getting any usable data to your PC.
Depending on your knowledge / skill level, this can take from 2 weeks (HW & STM pro with USB knowledge) up to several months.

It's okay to work long time, i need to know how to do this type of things so my main difficulty is to find how to start doing this kind of things. So where could i start to understand something about how to convert this data or where to plug the mic, or whatever ?? I'm a bit lost in here.

> 3) Something many people forget: you need some software on the PC side as well.

Apart from using stm32cubemx or stm32cubeIDE? Do you mean just to work with audio data? 

Thank you so much!

[LCE]

2) Okay, you could start by connecting a 3.3 V electret to the STM ADC. Quite simple, the microphone datasheet basically shows how to do that.

3) I mean how to work with "audio data".
If it's your own simple data stream (e.g., USB virtual comport), you need to handle that on the PC side with some self-made software.
If you make your STM32 look like a USB audio device, PC side gets simpler, but STM32 side will be much harder.

[rubenles]

And it is possible to see any data directly from a tera term using usart connections? 

The main problem of doing the things you are telling is where to start..., I need to see any documentation or something to start, what can i read or watch to learn about this?

Thank you

[LCE]

Sure, you can send audio data via UART - and with some experience you can even see the sine in the numbers ... 😉

Starting: get a Nucleo board and do it. 

[rubenles]

I already got the nucleo board but not the knowledge 😂

[LCE]

At least something!

There are so many tutorials out there for STM32, lots of example source code, it just takes time and effort.

[tuyet]

can you please share some examples source code or any link/video tutorial for STM32 connect to MEM microphone or audio 

thank you !!