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.
- 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
- Analog:
| MCU | Mic |
|---|---|
| GND | GND |
| 3.3V | VCC / VDD |
| GPIO 35 | Out |
| MCU | Mic |
|---|---|
| GND | GND |
| 3.3V | VCC / VDD |
| GPIO 26 | BCLK |
| GPIO 33 | Data / DOUT |
| GPIO 25 | LRCL |
| MCU | Display |
|---|---|
| GND | GND |
| 3.3V | VCC / VDD |
| GPIO 21 | SDA |
| GPIO 22 | SCL |
