Microphone to microcontroller

[Lay-Z]

Hi,

Im looking for microphone to microcontroller. It is important that the microphone should have automatic gain. Im looking for microphone similar to Gravity__Analog_Sound_Level_Meter_SKU_SEN0232-DFRobot 1 but more cheaper.

I found only max9814 and sen-12642 but that microphones has no automating changed ranges.
Have you any suggestions?

[SiliconWizard]

The MAX9814 has an AGC, what more do you need?

[Faranight]

MAX9814 is noisy as hell. I have bad experience with this IC as I tried it with an electret microphone, and the hissing was almost unbearable at higher gains. I then switched to TLV6742 and got complete and utter silence. No autogain though.

[Lay-Z]

I would like to build a sound level measuring device, something like this
https://svantek.com/
this allows you to measure ambient noise. I simply mean that I would like to get the dB level from the environment as a result. And I found that i don't need AGC. In my electronic collection found sen 12642. Is possible to use it to solution such this?

[Kalvin]

If you want to measure the ambient noise level, and relate the results to the human physiological perception, you need A-Weighting filter after microphone to emulate human perception of acoustic energy.

A-Weighting Filter For Audio Measurements:
https://sound-au.com/project17.htm

[Lay-Z]

Okey thanks for explain. Could you recommend something, cause i can find nothing :/

[Brianf]

Okey thanks for explain. Could you recommend something, cause i can find nothing :/

https://www.ebay.co.uk/itm/175523979279

I believe that it can be found cheaper on Aliexpress.

[SiliconWizard]

I would like to build a sound level measuring device, something like this
https://svantek.com/
this allows you to measure ambient noise. I simply mean that I would like to get the dB level from the environment as a result. And I found that i don't need AGC. In my electronic collection found sen 12642. Is possible to use it to solution such this?

If you want to measure sound level, you absolutely don't want to use any kind of automatic gain. So I don't really get your first post.

[Lay-Z]

Thanks Brinaf for help.
SilconWizard, when I wrote the first one post I thought I need AGC, but later it turned out that I doesnt need it, so in the next post I writed that i dont need AGC. Sorry for the confusion guys 

[bidrohini]

You can check waveshare's sound sensor: https://www.waveshare.com/sound-sensor.htm
It features a microphone and an Onboard audio power amplifier LM386.

[Doctorandus_P]

 Those aluminimum can based electret's are so last century...

These days microphones look like some 1 by 2mm SMT part and they directly interface digitally with a microcontroller (maybe I2S or something).

I just looked at a random one. The link below is a 3 by 4mm device, so it's a bit bigger then I thought.

https://www.cuidevices.com/product/audio/microphones/mems-microphones/cmm-4030dt-26165-tr

these things are made by the billions. Every phone has one (or maybe more?) of them.

[Sacodepatatas]

Those aluminimum can based electret's are so last century...

These days microphones look like some 1 by 2mm SMT part and they directly interface digitally with a microcontroller (maybe I2S or something).

I prefer those little cans because they are more versatile (you can use them with a MCU throught an ADC, or you just use some analog circuitry for conditioning the signal before processing). If you want to make a level meter, you wouldn't like to lose accuracy when converting a linear value from the ADC to a logarithmic value. Hence a propper conditioning of the analog signal (a programmable/selectable decade-gain amplifier) would keep a good compromise of bit accuracy and measure depth.

If you already have a discrete digital signal out of the microphone, then you can't reach such performance.

[SiliconWizard]

Many of the low-cost MEMS microphones have a relatively poor sensitivity, which can make them unsuitable for measuring sound level if you want to be able to go down to 30-35 dB SPL or below.

So sensitivity and frequency response should both be considered before making a choice. MEMS mics with better sensitivity can be very expensive.

[spostma]

an inspiring sample project with an ESP32, an I2S microphone and a FFT sound detector:
https://iotassistant.io/esp32/smart-door-bell-noise-meter-using-fft-esp32/