The Ai-Thinker VC-02 Module is an ultra-low-cost, offline voice recognition module designed for local speech processing without requiring internet connectivity or cloud servers.
The Ai-Thinker VC-02 Module is an ultra-low-cost, offline voice recognition module designed for local speech processing without requiring internet connectivity or cloud servers. Powered by the Unisound US516P6 voice core chip operating at 240 MHz, it features a 32-bit RISC processor, dedicated DSP instruction sets, floating-point unit (FPU), and hardware FFT accelerator for rapid signal processing and high-accuracy noise reduction.
The module supports offline identification of up to 150 customizable voice commands (such as wake words, light controls, fan speeds, and relay toggles). Equipped with an onboard 242 KB SRAM and 2 MB SPI Flash, the VC-02 integrates an analog microphone frontend (SNR ≥ 94 dB) and a dual-channel DAC output for direct audio response prompts. It communicates with external microcontrollers via standard UART, I2C, PWM, and GPIO logic lines.
The VC-02 module is widely used in smart home appliances, voice-controlled lighting systems, smart switch boxes, voice toys, and industrial automation. Operating on 3.6V to 5.0V DC power input with 3.3V logic compatibility, it integrates seamlessly with development platforms like Arduino, ESP32, ESP8266, STM32, and Raspberry Pi.
| Core Chipset | Unisound US516P6 32-bit RISC core @ 240 MHz |
|---|---|
| Hardware Accelerators | Integrated DSP instruction set, FPU, and FFT accelerator |
| Offline Command Capacity | Supports up to 150 local voice command phrases |
| Memory & Storage | 242 KB high-speed SRAM + 2 MB onboard Flash memory |
| Audio Interfaces | 1× Analog Microphone Input (SNR ≥ 94 dB) & Dual-channel DAC output |
| Operating Voltage | 3.6V to 5.0V DC (>500mA current capacity recommended) |
| Peripheral Interfaces | UART, I2C, PWM, DAC, and GPIO pins |
| Serial Baud Rates | UART1 default 115200 bps (up to 3 Mbps), UART0 default 57600 bps |
| Compact Form Factor | 18mm × 17mm × 3.2mm SMD / DIP breakout options |
What is the operating voltage?
3.6V to 5.0V DC (>500mA current capacity recommended).
Which interface does it use?
1× Analog Microphone Input (SNR ≥ 94 dB) & Dual-channel DAC output.
Is it compatible with Arduino and ESP32?
Yes. It works with Arduino, ESP32, ESP8266, Raspberry Pi projects.
Can I buy the Ai-Thinker VC-02 module in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
