ESP-8266 stepper motor midi music module (ESP32 "synthesizer" Arduino project)

Using the ESP-8266 I've started to make some "noise" with one of my old stepper motors.The code can be found here: https://github.com/marcel-licence/esp8266_stepper_music_module
I am using the esp32 audio kit (based on esp32-a1s) which does record all the sound with its two microphones. The audio kit runs a little firmware to create some delay/echo effects. The line out signal is directly recorded.
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Intro: (0:00)
Overview: (0:46)
The piezzo speaker: (1:34)
Used components: (2:01)
Let's look into the details: (3:03)
Finally some "noise": (9:12)

Видео ESP-8266 stepper motor midi music module (ESP32 "synthesizer" Arduino project) канала Marcel Licence