BLACKSTOMP: Quick Development Platform for ESP32-A1S Digital Audio Effect Processor

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Blackstomp is a digital audio effect processor development platform based on ESP32-A1S module. Here are some of the feature’s highlights:

• Stereo line or guitar input/output
• Microphone input with programmable gain pre-amp
• Potentiometer, switch, button, and rotary encoder interfaces
• OLED display interface
• MIDI input/output interface
• WiFi and Bluetooth connectivity
• 24-Bit stereo codec with analog pass-through
• Dual core Tensilica Xtensa LX-6 240 MHz 32-bit processor with single precision FPU (floating point unit)
• C++ library for fast development with Arduino IDE and ESP-IDF development tool chains.

The platform consists of hardware and software to implement digital effect pedal/stompbox. The hardware is designed for the simplicity and cost effectivity, while the software is designed to ease and speed up the application development.

Table of Contents

• I. Hardware
  • I.1. Schematic Diagram
  • I.2. Reset and Booting
  • I.3. Indicator LEDs
  • I.4. Foot Switches and Buttons
  • I.5. Control Ports
  • I.6. Encoder Port
  • I.7. I2C Port
  • I.8. UART (Serial TTL) and MIDI Port
  • I.9. Recommended Development-Mode Pedal Wiring
  • I.10. Printed Circuit Board (PCB)
• II. Software
  • II.1. Development Tools and Library Installation
    • II.1.1. Installing Arduino IDE
    • II.1.2. Installing and Updating Blackstomp Library
    • II.1.3. Using ESP-IDF
  • II.2. Getting Started
    • II.2.1. Setting Up The Board Configuration
    • II.2.2. Compile, Upload, and Run The Example Sketch
  • II.3. Blackstomp Programming Guide
    • II.3.1. Writing Simplest Effect Processor
    • II.3.2. Adding Foot Switch Control
    • II.3.3. Writing Button Event Handler
    • II.3.4. Adding Parameter Control
    • II.3.5. Writing Control Event Handler
    • II.3.6. Controlling The LED Indicators
    • II.3.7. Controlling The Analog Bypass
    • II.3.8. Adding Bluetooth Interface
    • II.3.9. Adding MIDI Interface
  • II.4. Blackstomp Library Reference

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