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The Ai-Thinker VC-02-Kit is an all-in-one development kit designed to evaluate and prototype offline voice recognition applications. At its core is the US516P6 32-bit RISC core running at up to $240\text{MHz}$, specifically optimized for neural-network-based speech feature extraction, noise cancellation, and local command matching.

Because all processing occurs entirely on-chip, the VC-02-Kit delivers low latency ($<0.2\text{s}$) and total privacy without needing internet connections, Wi-Fi networks, or cloud subscription APIs. The development kit includes dual onboard electret microphones for far-field audio reception, a $2\text{-pin}$ JST speaker connector (driving up to $2\text{W}/4\Omega$ speakers), Type-C USB power/programming interface, user buttons, and access to general-purpose I/O pins for triggering relays, LEDs, or communicating via UART with host controllers like Arduino, ESP32, or STM32.

Key Features and Benefits

• 100% Local Offline Voice Recognition: Fast response time without internet lag or privacy concerns regarding cloud voice recording.

• Dual Microphone Array: Onboard dual-mic setup improves directional voice capture and ambient noise reduction.

• Onboard Audio Amplifier & Speaker Output: Integrated Class-D audio amplifier drives external speakers directly for spoken voice prompts and feedback.

• Flexible UART & GPIO Interface: Sends serial strings or toggles digital output pins directly upon detecting recognized command phrases.

• Custom Command Training Support: Easily flash custom wake-up words, control phrases, and voice feedback through Ai-Thinker's web firmware generator tool.

• Type-C USB Powered: Convenient $5\text{V}$ power input and USB-to-UART serial interface for firmware flashing and debugging.

Technical Specifications

Interface & Pinout Reference

1. Key Connection Pins:

2. Operation Workflow:

 [User Spoken Command] ---> [Dual Mics] ---> [VC-02 US516P6 DSP] ---> [Matches Command in Flash]
                                                                               |
                                    +------------------------------------------+
                                    |                                          |
                      [Sends Serial String via UART]              [Toggles Output GPIO / Relays]

Applications

• Offline Smart Home Automation: Voice-activated lighting, fan speed switches, and curtain controllers.

• Touchless Industrial & Medical Equipment: Hands-free machine control and voice-triggered timers.

• Interactive Toys & Robotics: Spoken command response for mobile rovers and animatronics.

• Smart Kitchen Appliances: Hands-free timer alerts, voice-guided microwave and air fryer controls.

Package Includes

• 1 x Ai-Thinker VC-02-Kit Voice Recognition Development Board

• 2 x Male Pin Header Strips (Unsoldered/Pre-soldered depending on batch)

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Anti-static ESD protective packaging for safe transit