ESP32 SDCard Wave File Example
This code shows how to record a WAV file to an SD Card attached to an ESP32 and then play it back.
There's an explanatory video here
There are two projects - one using Arduino and one using the Esspresif IDF. Both of these projects use PlatformIO to build.
config.h for your device. In particular, you will probably want to change the button that is used to trigger recording and playback.
// record button #define GPIO_BUTTON GPIO_NUM_23
To record audio press and hold the button. Recording will stop when you release the button.
The SD Card should contain a file called
test.wav after a successful recording.
To playback the recording push the button.
Once the playback has finished the device will switch back to waiting for a new recording to be made.
arduino-wav-sdcard folder has code that works on the current release of Arduino for the ESP32.
idf-wav-sdcard folder has code that works with the latest IDF release.