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s-marley / ESP32-INMP441-Matrix-VU

And ESP32 powered VU matrix using the INMP441 I2S microphone
MIT License
85 stars 28 forks source link

Pulse without sound #1

Closed Sle77en closed 3 years ago

Sle77en commented 3 years ago

Hi,

I have pulses without a sound. So even with silence. I suspect that the microphone has a bug. What do you think?

Here you can take a look: https://www.dropbox.com/s/tudjnyesxygd2lo/telegram-cloud-document-2-5282922645820541774.mp4

s-marley commented 3 years ago

That definitely doens't look right. You could try adding a capacitor across the 3V3 and GND lines on the mic, see if there is some electrical interference that is being picked up, but these digital mics are normally pretty good at dealing with that anyway. I'm sure you've already checked that all of your connections are correct? Thats's a nice looking matrix by the way! Try running just this code without the LEDs, and see if you still pick up those jumps on the serial plotter output.

Sle77en commented 3 years ago

Hi :) Thanks for your fast answer! I am now one step closer to the solution. The malfunction only occurs when I operate the matrix with a power supply unit (5V / 10A). There is no disturbance when I operate it via USB via the ESP32. Do you have a tip for me?

s-marley commented 3 years ago

Sounds like it might be a cheap, noisy power supply! Try the capacitor thing I mentioned and see if that makes a difference. If not, you'll just have to use a higher quality supply unfortunately. Also make sure everything is well grounded as usual.

Sle77en commented 3 years ago

Yes it was a noisy power supply. Now i have a good one and all works fine :) Thank you very much!