ESP32-POE Audio Setup

[SSEV]

I need to add a microphone and audio out (mono) speaker to the ESP32-PoE.  First what are any recommend hardware setups to complete this task with this micro controller?

Secondly if I have 1 GPIO pin being used for an LED and the UEXT connector being used to connect a different radar sensor, and also the SD card being used, will I have enough pins to add the audio and microphone to this setup???

-scott

[LubOlimex]

What interface is using the radar sensor? UEXT, SPI, I2C?

[SSEV]

My apologies,  the specific radar is  https://www.seeedstudio.com/24GHz-mmWave-Radar-Sensor-Human-Static-Presence-Module-p-5267.html 

I am still figuring out how to connect the radar itself.  I believe it uses the tx, rx and 2 additional input pins on the olimex board.

[SSEV]

If the audio is run on I2C.  That takes up pins 13 and 16.  Correct? 

[SSEV]

Now I have confused myself.  Can anyone confirm the proper way to connect an audio speaker to the ESP32-PoE?  Is the h/s using I2S or does it have to use I2C?

[LubOlimex]

Both are possible. It depends on the specific audio goals and hardware. What do you consider audio speaker? We have connected a buzzer in our AgonLight2 design to a GPIO:

https://github.com/OLIMEX/AgonLight2/blob/main/HARDWARE/AgonLight2_Rev_B/AgonLight2_Rev_B.pdf

[SSEV]

Ended up getting a MAX brand amplifier wired and I2S working with
BCLK: Pin 26
LRC: Pin 25
DIN (DOUT): Pin 22

Had to change some of the libraries to compile everything properly but was able to get audio out to a speaker from the internal storage for the mp3 file on the esp32.

[mihaiadrian]

Could you please give more details about how you connected the i2s device to Olimex esp32-poe ? especially where I can find the pins  :

BCLK: Pin 26
LRC: Pin 25
DIN (DOUT): Pin 22

I don;t see them in this img:  https://www.olimex.com/Products/IoT/ESP32/ESP32-POE-ISO/resources/ESP32-POE-ISO-GPIO.png

[LubOlimex]

No, it doesn't work like that. You need to find three free pins and then re-define the software for the three free pins. You don't have to use specific pins for I2S, any free GPIO can be configured for I2S operation.

https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/i2s.html