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SunFounder Fusion HAT+

Welcome to the Fusion HAT+ Documentation

The Fusion HAT+ is a powerful and developer-friendly expansion board designed to unlock the full potential of the Raspberry Pi in robotics and automation projects. Whether you’re an educator, maker, or professional developer, Fusion HAT+ provides the essential hardware foundation to rapidly build smart, interactive robots—from autonomous vehicles to voice-controlled assistants.

This board features an onboard MCU, extending the Raspberry Pi’s capabilities with additional PWM outputs and ADC inputs. Integrated motor drivers, audio modules, and user-friendly debugging features make development smoother and more efficient. From basic motion control to advanced voice interaction, Fusion HAT+ grows with your project needs.

Key Features

• Microcontroller-based control for enhanced PWM/ADC support

• Motor drivers for flexible mobility

• Built-in I2S audio and mono speaker for sound interaction

• Customizable I/O interfaces for easy sensor and actuator integration

• Smart power design with status LEDs, user button, and expansion-ready layout

• Onboard microphone for voice recognition and audio input

• Dedicated ZERO button for fast servo alignment

• Enhanced hardware stability and usability

• About this HAT
• Quick User Guide
  • Assembling the Fusion HAT
  • Charge
  • Power ON
  • Configure Shutdown Behavior
  • Install the fusion-hat Module
  • Safe Shutdown
• Hardware
  • Features
  • Interfaces
  • On-Board MCU
  • About the Battery
• Related Projects
  • GPIO Output
  • GPIO Input
  • PWM
  • ADC
  • Active Buzzer
  • Passive Buzzer
  • Servo
  • Motor
  • Ultrasonic Sensor Module
  • I2C (LCD1602)
  • SPI (LedMatrix)
  • NeoPixel LED Strip
  • Funsion HAT+ Microphone
  • Fusion HAT+ Speaker
• Think · Talk · Drive — AI-Powered with Multi-LLMs
  • 1. TTS with Espeak and Pico2Wave
  • 2. TTS with Piper and OpenAI
  • 3. STT with Vosk (Offline)
  • 4. Text Vision Talk with Ollama
  • 5. Connecting to Online LLMs
  • 6. Local Voice Chatbot
  • 7. AI Voice Assistant
• fusion_hat package
  • Subpackages
  • Submodules
• FAQ
  • Q1: Can the battery be connected while providing power to the Raspberry Pi at the same time?
  • Q2: Can the Fusion HAT+ be used while charging?
  • Q3: Why is there no sound from the speaker?
  • Q4: I encounter the error: “RuntimeError: Cannot determine SOC peripheral base address”.

Copyright Notice

All contents including but not limited to texts, images, and code in this manual are owned by the SunFounder Company. You should only use it for personal study,investigation, enjoyment, or other non-commercial or nonprofit purposes, under therelated regulations and copyrights laws, without infringing the legal rights of the author and relevant right holders. For any individual or organization that uses these for commercial profit without permission, the Company reserves the right to take legal action.