Pico USB Volume Controller for Arcade/MAME Machines

Control volume and exit games with ease using the Raspberry Pi Pico and a rotary encoder.

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📌 Table of Contents

• 🕹 Introduction
• ✨ Features
• 📦 Requirements
• 🚀 Setup and Installation
• 🔌 Hardware and Wiring
• ⚙️ Configuration
• 📚 Resources
• 📝 Code Base Source

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🕹 Introduction

This project provides a simple and effective solution for volume control and game exit functionality for Arcade/MAME machines using a Raspberry Pi Pico and a rotary encoder.

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✨ Features

• 🔊 Volume Control: Twist the encoder to adjust the volume.
• 🔇 Mute Feature: A quick press mutes and unmutes the audio.
• 🚪 Exit Games: An additional button sends the ALT + CTRL + F4 command to exit games.
• 🔍 HID Integration: The Raspberry Pi Pico acts as a HID when connected, making it a plug-and-play solution.

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📦 Requirements

• Hardware:

  • Raspberry Pi Pico
  • Rotary Encoder (with a push button)
  • Optional push button (for the ALT + CTRL + F4 feature)

• Software:

  • SuperF4

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🚀 Setup and Installation

1. CircuitPython: Flash your Raspberry Pi Pico with CircuitPython. Guide.
2. Code Transfer: Drag and drop the boot.py and code.py files onto your Raspberry Pi Pico.
3. Lib Folder: Copy over the lib folder to your Raspberry Pi Pico.
4. SuperF4 Setup: Install SuperF4 on your arcade machine.

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🔌 Hardware and Wiring

Components:

• Raspberry Pi Pico
• Rotary Encoder (with a push button)
• Optional push button for game exits

Wiring Guide:

• Rotary Encoder:

  • A (S1) Pin -> GP9 on Pico
  • B (S2) Pin -> GP10 on Pico
  • SW (Key) Pin -> GP12 on Pico
  • + Pin -> 3.3V on Pico
  • GND Pin -> GND on Pico

• Game Exit Button:

  • One end -> GP13 on Pico
  • Other end -> GND on Pico

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⚙️ Configuration

Check the code.py file for a configuration section at the top. Customize debounce delays, pin assignments, and more to fit your setup.

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📚 Resources

• Raspberry Pi Pico Documentation
• SuperF4 Official Page

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📝 Code Base Source

Inspired by the multimedia-knob repository by Xitee1.