Sound recording to SD card with an ESP32

Setting up the project: Software Setup

1. Clone the repository

2. Install the Arduino IDE

3. Set up the Arduino IDE up to be able to work with ESP32

4. Install the following Requirments

   • <NTPClient.h> important! to run as expected, please add some extra lines to the library
   • <mySD.h>
   • <ESP32WebServer.h>

5. Change the SSID and Password to the one you are using:

   const char* ssid = <YOURSSIDNAME>;

   const char* password = <YOURWIFIPASSWORD>;

Hardware Setup

SD Card Module

Connect SD Card Module pins as follows:

• CS to 5
• SCK to 18
• MOSI to 23
• MISO to 19 (12 won't work)
• VCC to 5V! (3.3V might work, too)
• GND to GND

INMP441 Microphone sound recording

connect Mic pins as following:

• VDD to 3V
• GND to GND
• L/R to GND (Left channel or right channel)
• WS to 22 (Left right clock)
• SD to 21 (Serial data)
• SCK to 25 (Serial clock)

mic test example

Reading files from the SD Card

• code via

Pub/Sub setup for sensor data

The audio recording and the collection of sensor data is currently seperated

For the setup of MQTT, NodeRED, Sensor data collection please read the instructions here