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https://github.com/marcel-licence/esp32_midi_sampler


https://github.com/marcel-licence/esp32_midi_sampler

arduino esp32 midi sampler synthesizer

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# esp32_midi_sampler

ESP32 Audio Kit Sampling MIDI Module - A little DIY Arduino based audio/synthesizer project



- video presentation of the initial state of this project https://youtu.be/7uSobNW7_A4 

- little quick start guide to get started with arduino synthesizer / music projects: https://youtu.be/ZNxGCB-d68g



> **⚠️ Note:** This project might be outdated and is no longer actively maintained. Development has continued in a new repository, which covers the **ESP32** and other boards as well. Please check out the latest version of the project here: **[ml_synth_sampler_example](https://github.com/marcel-licence/ml_synth_sampler_example)**



The project is written for the ESP32 Audio Kit V2.2

Arduino Settings:

- Board: ESP32 Dev Module

- PSRAM: Enabled



ESP32 LittleFS Data Upload is required to upload samples into flash.



Compile information:

- board 'esp32' Version 1.0.6

- core 'esp32' Version 1.0.6



Following libraries are used:

- FS in Version 1.0

- LittleFS_esp32 in Version 1.0.6

- SD_MMC in Version 1.0

- WiFi in Version 1.0

- AC101 in Version 0.0.1

- Adafruit_NeoPixel in Version 1.7.0

- Wire in Version 1.0.1

- ML_SynthTools (https://github.com/marcel-licence/ML_SynthTools)



Configuration of the Audio Kit:

- Set DIP 2, 3 to on and all other DIP switches to off (required for SD card access)



To store samples on the ESP32 you can upload them using the Arduino plugin:

- ESP32 LittleFS Data Upload (src: https://github.com/lorol/arduino-esp32littlefs-plugin)



A WS2812 8x8 led matrix can be connected to IO12, 3V3, GND (defined by LED_STRIP_PIN in config.h)

ref: https://hackaday.com/2017/01/20/cheating-at-5v-ws2812-control-to-use-a-3-3v-data-line/



MIDI should be connected to IO18  (you can modify the define MIDI_RX_PIN in config.h)



AS5600 can be now used for scratching. To use it, set the define "AS5600_ENABLED" in config.h as active.

The connection is defined below:

- SDA: IO21

- SCL: IO22

Note: MIDI_RX_PIN changed from IO18 to IO19 on the ESP32 Audio Kit.

In that case you can attach a 160x80 display but its connection will change to:

- MOS: IO23

- SCLK: IO18

- CS: IO5

- DC: IO0

- RST -> should be connected to RST / EN of the ESP32



A controller mapping can be found in z_config.ino.

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Keys can be used with only one IO by a little modification of the ESP32 Audio Kit (ref: https://youtu.be/r0af0DB1R68)

- move R66-70 to R60-R64 (0 Ohm resistors, you can also put a solder bridge)

- place at R55-R59 a 1.8k resistor

Finally the define AUDIO_KIT_BUTTON_ANALOG in config.h is required



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If you have questions or ideas please feel free to use the discussion area!



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External resources:

reverb_module.ino is a ported from stm32 code (src. https://github.com/YetAnotherElectronicsChannel/STM32_DSP_Reverb/blob/master/code/Src/main.c)

A great video explaining the reverb can be found on his channel: https://youtu.be/nRLXNmLmHqM



Specifications and datasheets:

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ESP32-A1S (AC101 variant): https://www.makerfabs.com/desfile/files/ESP32-A1S%20Product%20Specification.pdf

ESP32-A1S (ES8388 variant): https://github.com/marcel-licence/esp32_midi_sampler/files/7075076/esp32-a1s_v2.3_specification.pdf

AC101 user manual: http://www.x-powers.com/en.php/Info/down/id/96

ES8388 datasheet: http://www.everest-semi.com/pdf/ES8388%20DS.pdf

ES8388 user guide: https://dl.radxa.com/rock2/docs/hw/ds/ES8388%20user%20Guide.pdf



# Derived projects

If you like please let me know if you want to get your project listed here which is based on the esp32_midi_sampler project.