Search found 4 matches

by chris_oz
Wed Apr 15, 2020 9:15 am
Forum: ESP-IDF
Topic: Inputting audio to an ESP32 from an INMP441 I2S microphone: success
Replies: 13
Views: 74153

Inputting audio to an ESP32 from an INMP441 I2S microphone: success

I'm working on a baby monitor. I've got this microphone: https://invensense.tdk.com/products/digital/inmp441/ So i got this audio input to work :D ! Here I'll share my findings: Here's the setup code: (note that this mic is not PDM) i2s_config_t i2s_config = { .mode = (i2s_mode_t)(I2S_MODE_MASTER | ...
by chris_oz
Tue Apr 14, 2020 4:36 am
Forum: ESP-IDF
Topic: How to input audio using I2S PDM
Replies: 5
Views: 12867

Re: How to input audio using I2S PDM

So your question about PDM prompted me to search around, and the guy who created this INMP441 breakout PCB tells me that they *dont* use PDM to the best of his knowledge: https://hackaday.io/project/4411-inmp441-mems-microphone So perhaps this thread has run its course, and I apologise for potential...
by chris_oz
Tue Apr 14, 2020 4:00 am
Forum: ESP-IDF
Topic: How to input audio using I2S PDM
Replies: 5
Views: 12867

Re: How to input audio using I2S PDM

Hi, thanks for replying, really appreciate it :D I also had a look through the datasheet and I came away confused. It doesn't explicitly say it's a PDM mic or not, so I assumed that it was one, given the price. Perhaps it doesn't require PDM mode. In fact, i can get audio (of very poor quality) when...
by chris_oz
Mon Apr 13, 2020 11:25 pm
Forum: ESP-IDF
Topic: How to input audio using I2S PDM
Replies: 5
Views: 12867

How to input audio using I2S PDM

Hi, I've spent all weekend trying to get my ESP32 to input audio using I2S. Now i've had some success with I2S in 32 bit mode, however it was quite distorted, but you could make out that it was actually working a bit. I noticed it outputs a signed value, where the lowest byte is always 0x00. I since...