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Circuit is done as shown in the diagram. Volume can be controlled using 10K POT.
Copy and paste the program to your Arduino libraries folder. Compile and upload the example code to your Arduino board. A file named “2.mp3” will be played in my code. A file named “2.mp3” should be there in your SD card. Otherwise, it will give an error.
Refer http://www.haberocean.com/2019/05/esp-12f-iot-module-programmer-circuit/ to get the programming basics.
Upload the following program to ESP-12F IOT module.
This example shows how print out the files in a
directory on a SD card
SD card attached to SPI bus as follows:
** MOSI – pin 11
** MISO – pin 12
** CLK – pin 13
** CS – pin 4
created Nov 2010
by David A.
Connect the output to a Digital Storage Oscilloscope to see the variations in output with the sound signals on electret MIC.