Ai-Thinker VC-02 Kit Voice Recognition Board

Bring true offline voice control to your projects with the Ai Thinker VC 02 Kit, a development board built around the Unisound US516P6 speech recognition chip. Unlike cloud-based voice assistants, this module performs recognition entirely on-device, with no internet connection required, making it ideal for privacy-conscious builds, fast response times, and reliable operation even without WiFi.

The US516P6 chip uses a 32-bit RISC core paired with a dedicated DSP instruction set, an FPU for floating-point operations, and an FFT accelerator, giving the module strong recognition accuracy and low latency in real-world use. It supports up to 150 customizable local offline voice commands, running on a lightweight RTOS, and communicates through a wide range of interfaces, including UART, I2C, SPI, PWM, and DAC audio output, making it easy to integrate into diverse embedded designs.

This development kit adds an onboard CH340C USB-to-serial chip for straightforward debugging and firmware uploads, along with wake-up and status indicator lights for quick visual feedback during testing. It’s a great fit for hobbyists and engineers building voice-controlled smart home devices, appliance switches, robotics, and interactive toys where offline reliability matters more than cloud dependency.

Specification:

• Voice Chip : Unisound US516P6
• Offline Commands : Up to 150 local commands
• Communication Interfaces : UART, I2C, SPI, PWM, DAC
• Onboard USB Chip : CH340C (USB-to-Serial)
• Operating Voltage : 5V DC
• Current Consumption : Approx. 500mA
• Flash Memory : 2MB
• System : Lightweight RTOS