ESP32-POE Audio Setup

SSEV · June 07, 2023, 05:11:01 PM

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 · June 08, 2023, 08:13:53 AM

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

SSEV · June 09, 2023, 04:44:27 AM

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 · June 10, 2023, 03:30:17 PM

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

SSEV · June 10, 2023, 10:39:36 PM

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 · June 12, 2023, 10:38:16 AM

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 · June 19, 2023, 02:14:45 PM

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 · September 03, 2024, 12:26:44 PM

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 · September 03, 2024, 01:39:13 PM

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