LD3320 Speech Recognition Module Serial/SPI Interface, Intelligent Voice Control Development Board, TTL Programming Board

The LD3320 Speech Recognition Module operates on a wide DC voltage range from 3.3V to 5V. This makes it directly compatible with most common microcontroller platforms like 5V Arduino boards and 3.3V systems like ESP32 or STM32 without requiring a level shifter for power.

The module provides two primary digital communication interfaces: a UART (Serial) interface and an SPI interface. You can select one based on your microcontroller's available pins and library support. Connection is via the standard pin headers on the board, and example code is typically provided for both protocols.

Yes, the module supports offline programming of up to 50 custom voice commands. You program these commands into the module's memory via the provided TTL programming interface using dedicated configuration software or libraries. The recognition is typically optimized for Chinese Mandarin keywords.

No, the LD3320 module performs all speech recognition processing offline on the chip itself. It does not require Wi-Fi, Bluetooth, or any cloud connection, ensuring fast response times, operational reliability in areas without network access, and enhanced user privacy.

Under typical conditions, the module achieves recognition accuracy up to approximately 85% at a distance of up to 1 meter from the built-in microphone. Accuracy can be influenced by ambient noise, speaker accent, and command clarity. Sensitivity can be adjusted in software to optimize performance for your specific environment.