M5StickC or M5StickC PLUS microphone basic example not working [Solved]

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Tue, 01 Feb 2022 02:41:25 GMT

miamifish — Tue, 01 Feb 2022 02:41:25 GMT

Thank you to @felmue . The original issue I posted was resolved. We can close this post for basic microphone example works just fine after @felmue's suggestions. I will open a separate thread for the issue with regards to microphone offset in M5stickcPlus.

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Sun, 30 Jan 2022 07:35:46 GMT

felmue — Sun, 30 Jan 2022 07:35:46 GMT

Hello @miamifish

w/o trying it myself one thing that seems wrong to me is the fact that in every loop about READ_LEN (=512) samples are read from the microphone but at the same time you plot about 1000 samples...

Thanks
Felix

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Sat, 29 Jan 2022 08:34:35 GMT

ajb2k3 — Sat, 29 Jan 2022 08:34:35 GMT

@felmue said in M5StickC or M5StickC PLUS microphone basic example not working:

Hello guys

I quickly had a look, but I couldn't spot the reason why the example doesn't work. Sorry.
But since the factory test code works maybe you could try to extract the necessary microphone code from there?

Edit: Just had another look using M5StickCPlus and the fix is quite easy. The gain factor needs to be upped to 30 (from 3) like this:
#define GAIN_FACTOR 30
and if you compile for arduino-esp32 version 2.x.x you also need to add this line:
pin_config.mck_io_num = GPIO_NUM_0;
to the pin config.

Thanks
Felix

Thanks @felmue I thought you may be able to solve this one and give the solutions.

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Fri, 28 Jan 2022 20:49:30 GMT

miamifish — Fri, 28 Jan 2022 20:49:30 GMT

Sorry here is print code -

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Fri, 28 Jan 2022 20:47:48 GMT

miamifish — Fri, 28 Jan 2022 20:47:48 GMT

Thank you Felix & ajb2k3! I tried to run it using the above changes and the example runs so well on M5stickc Plus. Is it possible to print the values using the Arduino IDE's serial plotter? I tried it like this, but it is not a clean wave ....!! There seems to be an offset in the signal? Thank you so much for saving the day!

0_1643402786324_Mic_Plotting.jpg

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Fri, 28 Jan 2022 19:18:48 GMT

felmue — Fri, 28 Jan 2022 19:18:48 GMT

Hello guys

I quickly had a look, but I couldn't spot the reason why the example doesn't work. Sorry.
But since the factory test code works maybe you could try to extract the necessary microphone code from there?

Edit: Just had another look using M5StickCPlus and the fix is quite easy. The gain factor needs to be upped to 30 (from 3) like this:

#define GAIN_FACTOR 30

and if you compile for arduino-esp32 version 2.x.x you also need to add this line:

pin_config.mck_io_num = GPIO_NUM_0;

to the pin config.

Thanks
Felix

Reply to M5StickC or M5StickC PLUS microphone basic example not working [Solved] on Fri, 28 Jan 2022 17:30:06 GMT

ajb2k3 — Fri, 28 Jan 2022 17:30:06 GMT

You will be lucky to get a response at the moment due to the Chinese New Year.
@felmue do you have any experience with the Stick C mics and Arduino?
Have you tried comparing the microphone code between the two? it could be that something has changed and the code has not been updated.