Teensy 3.1 Audio Adapter Board - what microphone?

[Brendon Shaw]

Could anyone recommend a microphone to be used with the Teensy 3.1 Audio Adapter Board? I want to use it in a room to detect/monitor so not sure if to use a electret microphone something like this:

http://shop.pimoroni.com/products/a...lwlK4IiGUQv6p2NzMGyxrCTDdG3B1mx7xUaAnGV8P8HAQ

 

[dtroy]

Hi @Brendon, did you figure this out ?
I am trying to figure out the same exact thing. There's a post about using the audio library with that microphone:
https://forum.pjrc.com/threads/26798-(Awesome)-Audio-Library-FFT-amp-analogReference
But not the audio Adapter.

 

[cartere]

Something like this will work on the audio adapter.

https://www.sparkfun.com/products/8635

 

[dtroy]

Hi @cartere, Thanks for the reply!
Do you happen to know if it's possible to use the amplified adafruit mic ? (http://www.adafruit.com/product/1063)
I believe there seems to be a problem because it's floating at around 1.6V. I assume you'll have to connect it to the Teensy's 3.3V pin.

Digging through the forums, I just found this post by Paul which suggests you have set the audio shield's input to AUDIO_INPUT_LINEIN instead of AUDIO_INPUT_MIC and then you can set the lineInLevel (to 3.12 Volt I assume. I don't see a 3.3V option)
https://forum.pjrc.com/threads/2726...out-Audio-Shield?p=59756&viewfull=1#post59756

If you connect it as line in, do you still have control of the gain ? Or is that can only be controlled by the hardware pot on the adafruit board ?

I might buy the mic you suggested in case this doesn't work.

Thanks!!

 

[cartere]

I would think the adafruit amplified mic would "just work" with LINEIN. Adjust your input level with the pot on the mic board, perhaps using analyze_peak.

 

[cartere]

I hooked the adafruit board to the adc input on a teensy3.1 and it required the use of Paul's input network, using the mic on adc and a powered PC speaker on the dac output produced very useable audio.

 

[Brendon Shaw]

I used a mems mic, got some really good performance and FFT results. Not had time to really get it going and test/calibrate it but plan to kick off some more testing. The only thing I was looking at was a mic amplifier, but so far not seen the need to do this.

This is a link to the mic I purchase

https://www.coolcomponents.co.uk/br...rophone.html?gclid=COLUkpS5ysQCFasBwwodNV4A5w