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by robertguy09
Thu Apr 20, 2017 12:00 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add an I2S mic using device tree & simple-audio-card
Replies: 36
Views: 24770

Re: Add an I2S mic using device tree & simple-audio-card

Has anyone gotten this setup to work with Amazon's Alexa voice services?
by robertguy09
Tue Apr 11, 2017 6:24 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add an I2S mic using device tree & simple-audio-card
Replies: 36
Views: 24770

Re: Add an I2S mic using device tree & simple-audio-card

I think I figured out the problem. The clock needs to be ~2-4 MHz. I am not sure what the Pi's clock is set to, but I tested it with the audio library on a Teensy 3.2 and had the exact same problem I had on the Pi (SEL to gnd, left constantly 25%. SEL to 3.3V, left peak at 99%). With the Teensy, the...
by robertguy09
Thu Apr 06, 2017 5:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add an I2S mic using device tree & simple-audio-card
Replies: 36
Views: 24770

Re: Add an I2S mic using device tree & simple-audio-card

Still can't get the mics to work, but I found another weird issue that I hope will help narrow my problem down. When I set the SEL pin to 3.3v and do a recording, the left channel on the recording peaks at 99%. When I set the SEL pin to gnd and do a recording, the left channel on the record stays at...
by robertguy09
Tue Apr 04, 2017 4:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add an I2S mic using device tree & simple-audio-card
Replies: 36
Views: 24770

Re: Add an I2S mic using device tree & simple-audio-card

I'd guess you have LRCLK & BCLK swapped. I don't have such a module, but here's how I'd wire it: LRCLK -> FS (BCM19, pin 35) BCLK -> CLK (BCM18, pin 12) DOUT -> DIN (BCM20, pin 38) Then ground SEL, connect GND & 3V to the Pi's GND & 3V3. Thank you for the fast response! I have checked that over and...
by robertguy09
Tue Apr 04, 2017 3:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add an I2S mic using device tree & simple-audio-card
Replies: 36
Views: 24770

Re: Add an I2S mic using device tree & simple-audio-card

Hey all, great instructions! I got it working using this I2S mems microphone breakout from Adafruit: https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/overview I was wondering if you manage to change the bit-rate. I'd like to do recording with a bit rate of 16bit but it seems this sa...

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