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ESP32 Soundboard
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Soundboard (computer program), a web application or computer program with buttons that play short, often humorous sound clips.
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## Hardware
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* [ESP32] µC
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* [MAX98357A] PCM Input Class D Audio Power Amplifiers
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* [SD card]
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## Wiring
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### SD card
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SD card pin | ESP32 pin | Notes
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--------------|---------------|------------
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CS | GPIO05 |
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DI | GPIO23 (MOSI) |
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SCK | GPIO18 (SCK) |
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DO | GPIO19 (MISO) |
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CD | GPIO17 | optional
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### Touch
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ESP32 Touch pad | GPIO | Notes
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----------------|------|-------
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T0 | 04 |
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T1 | 00 | also bootloader (not usable on dev board)
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T2 | 02 | also bootloader (not usable on dev board)
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T3 | 15 |
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T4 | 13 |
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T5 | 12 |
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T6 | 14 |
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T7 | 27 |
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T8 | 33 |
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T9 | 32 |
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### I2S
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MAX98357A | ESP32 pin
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----------|-----------
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LRC | 25
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BCLK | 26
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DIN | 22
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GAIN | (VCC)
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SD | -
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## Build
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```bash
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git clone https://dev.xd0.de/hendrik/soundboard.git
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cd soundboard
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virtualenv .
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source bin/activate
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pip install -U platformio
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platformio run -t upload && platformio device monitor -b 115200
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```
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* Convert mp3 files: `sox ~/Music/input.mp3 -c 1 -r 11025 -b 16 output.wav trim 0 30`
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* SD card is tested with one FAT16 partion
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## ToDo
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* Prototype
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* reimplement tasks with a queue, see **i2s_push_sample()** from *esp-idf/components/driver/i2s.c*
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* Keypad layout
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* internal DAC?
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* Add-ons?
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* dynamic keypad thresholds
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* wav file headers
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* stack size in play task
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## References
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[ESP32 overview]: http://esp32.net
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[ESP32]: https://eckstein-shop.de/ESP32-Dev-Board-WiFi-Bluetooth-CP2102-USB-to-Serial-with-LiPo-charger
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[MAX98357A]: https://eckstein-shop.de/Adafruit-I2S-3W-Class-D-Amplifier-Breakout-MAX98357A
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