I want to develop an ultrasonic microphone array application. Is there a development board suited to this? The application would log recordings from 8 digital mems microphones to one or more SD cards.

How are the microphones going to interface?

Only a handful of the EVAL boards have dual micro-sd sockets, look at STM32F769I-EVAL

https://www.st.com/resource/en/user_manual/dm00276567-evaluation-board-with-stm32f769ni-mcu-stmicroelectronics.pdf

I think that 'how are the microphones going to interface' is my question. This is what I am trying to learn. I have read a bit about SAI and I2S. I'm looking for the easiest method to hook up 8 digital MEMS microphones and sample at quite a high sample rate. I am wondering if there is a development board that would be suitable for doing this. I would like to make a daughter board with my microphone array pattern and log the recordings. But I'm not sure where to start.

Thank you. This was useful. I have bought a NUCLEO H7 board to get started.

Hi @DWall.2​ ,

besides @Community member​ suggestions, please be sure to use a microphone with ultrasound capabilities, and that the sampling frequency of the processed signal is compatible with the ultrasound band.

-Eleon

Thanks. I will initially try with ICS-41352 microphones. I would ideally like to sample at greater than 192 kHz. But if I can log 8 channels, 16-bit, at 192 kHz it's a good start. Do you know if this will be possible with the two SAI ports on the NUCLEO-H723ZG? I could always use more than one microcontroller, and I have read that the SIA channels can be synchronised. It is of course vital that I have precise phase timing because I am using the array for directional measurement.