More than 2 Adafruit I2S MEMS microphones

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principemestizo
 
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More than 2 Adafruit I2S MEMS microphones

Post by principemestizo »

Hello, I just bought 2 of these microphones to use them in my raspberry pi as a stereo as the tutorial says: https://learn.adafruit.com/adafruit-i2s ... -pi-wiring -test

My question is: is it possible to connect 4 or even 6?
This is how I replicate this: https://www.amazon.com/-/es/Seeed-Studi ... 076SSR1W1/

(It will be a bit more expensive, but at least I can put it as far away as I want with cables, and as many mics as I want.)

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principemestizo
 
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Re: More than 2 Adafruit I2S MEMS microphones

Post by principemestizo »

principemestizo wrote:Hello, I just bought 2 of these microphones to use them in my raspberry pi as a stereo as the tutorial says: https://learn.adafruit.com/adafruit-i2s ... -pi-wiring -test
The tutorial (url correction): https://learn.adafruit.com/adafruit-i2s ... iring-test

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danhalbert
 
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Re: More than 2 Adafruit I2S MEMS microphones

Post by danhalbert »

The Rpi only has one I2S channel available, according to what I have seen. You can use up to two microphones on one I2S channel, because of I2S's provision for stereo.

The Seeed board gets around that by using a 4-channel ADC (and analog mic's)

I found a number of discussions of multiple mics, but it's not easy: https://www.google.com/search?q=raspber ... ltiple+i2s

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principemestizo
 
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Re: More than 2 Adafruit I2S MEMS microphones

Post by principemestizo »

Thanks for your answer. I will use 2.

I have a question: do you know the range of the microphone? I don't see anywhere that says so.

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danhalbert
 
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Re: More than 2 Adafruit I2S MEMS microphones

Post by danhalbert »

Microphones don't have ranges, but they have sensitivities. Here is the datasheet: https://media.digikey.com/pdf/Data%20Sh ... LM4H-B.pdf. You could compare that with other microphones.

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