esp32-rx

This is a sample project for receiving audio data using ESP32 microcontroller. The chip has a built-in 12-bit ADC which is used to process the analog audio from the external microphone module in real-time. The program also support input from I2S MEMS microphones that does not require the usage of the ADC. The received messages are optionally displayed on the attached OLED display.

Setup

• NodeMCU-ESP32
• OLED SSD1306
• Microphone, tested with the following, but others could be also supported:
  • Analog:
    • MAX9814
    • KY-037
    • KY-038
    • WS Sound sensor
  • I2S MEMS:
    • SPH0645

Pinout

Analog Microphone

MCU	Mic
GND	GND
3.3V	VCC / VDD
GPIO 35	Out

Digital (I2S) Microphone

MCU	Mic
GND	GND
3.3V	VCC / VDD
GPIO 26	BCLK
GPIO 33	Data / DOUT
GPIO 25	LRCL

I2C Display (optional)

MCU	Display
GND	GND
3.3V	VCC / VDD
GPIO 21	SDA
GPIO 22	SCL

Demo

https://user-images.githubusercontent.com/1991296/177211906-2102e9fa-8203-4b80-82e6-4839bf66f01f.mp4

Watch high quality on Youtube