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Thread: Teensy 4.0 Sound from Electret Bob to FFT

  1. #1

    Teensy 4.0 Sound from Electret Bob to FFT

    Hello! I just purchased the 4.0 and I was looking to do some FFT on live audio. I currently have a microphone that produces a 1.25V biased 2V peak to peak signal which I have been using with a MSGEQ7 and Teensy 2.0++. I would like to cut out the temperamental middleman and do it in software.

    I understand that the ADC is still being worked on, but I wanted to ask if there are any alternatives for a mic BOB or if I would be best just waiting until an ADC appears? Thanks for any help you can provide!

  2. #2
    Senior Member+ Frank B's Avatar
    Join Date
    Apr 2014
    I'd use the Audio Shield.

  3. #3
    A good suggestion, I'm hoping to avoid additional hardware, so waiting looks like the best option for the time being. Thanks for your help.

  4. #4
    Senior Member DD4WH's Avatar
    Join Date
    Oct 2015
    Central Europe
    Another option would be to use an I2S microphone breakout board.

    The ICS43434 delivers excellent audio results if you care about a little filtering of the 3.3V supply.

  5. #5
    That looks like a great option. I don't need it to be a particularly clean signal, but it still seems like it does what I need. Thanks for your help!

  6. #6
    Senior Member
    Join Date
    Aug 2016
    An additional option is to use MEMS microphones which often communicate directly via I2S or SPI.

    There's a good description in this document about the options.

    This thread looks at some of the practicalities of MEMS for Teensys.

    And this one looks at using multiple MEMS microphones

    Have fun!

  7. #7
    More great information! Thank you. I thought i2s was a higher level system, but it looks like little i2s BOBs may be just as good as the analog one I have.

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