M5Stack ASR Unit with Offline Voice Module (CI-03T)

The ASR Unit is an AI-based offline voice recognition module that uses the CI-03T intelligent voice chip. It provides several advanced functions including speech recognition, voiceprint recognition, voice enhancement, and voice detection.

It features Acoustic Echo Cancellation (AEC), which helps reduce echo and noise interference. This improves the accuracy of voice recognition, especially in noisy environments. The unit also allows mid-conversation interruption, so it can respond quickly to new voice commands while already processing another.

The module comes with 42 pre-configured English wake-up and feedback words. It communicates using UART serial transmission and can be activated either by UART commands or voice keywords. Users can customise wake-up words in multiple languages and define up to 300 voice commands.

The unit includes a built-in microphone for clear voice input and a speaker for audio feedback. It’s suitable for use in AI assistants, smart home systems, security monitoring, in-vehicle controls, robotics, smart devices, and healthcare products.

This unit is a practical solution for adding intelligent voice interaction to a wide range of applications.

Features

• CI-03T AI intelligent offline voice module
• Noise reduction processing
• 42 pre-installed commands
• Supports up to 300 command words
• UART serial communication
  Supports custom wake-up word
• Microphone and speaker
• Development platforms:
• UIFlow 1.0
• UIFlow 2.0
• Arduino IDE

Specifications

AI Module	CI-03T AI Intelligent Offline Voice Module
Command Words	Supports up to 300 command words, factory default 42 built-in commands
Wake-up Method	UART serial communication or voice keyword wake-up
Microphone	Analog microphone
Speaker	8Ω 1W speaker (used for output device wake-up feedback)
Communication	UART serial communication, default baud rate: 115200 8N1
Noise Reduction	AEC (Acoustic Echo Cancellation)
Operating Temperature	0–40°C
Product Size	48.0 x 24.0 x 16.0mm
Product Weight	10.5g

Resources

• Product documentation
• Schematic
• Dimensions

CI-03T Documents

• CI-03T AI Module Specification
• CI-03T AI Module Datasheet
• CI-03T AI Module Development Tutorial
• CI-03T Serial Flashing Tool

Software

• Quick start: Unit ASR Custom Firmware Generation and Flashing
• Unit ASR Arduino Tutorial
• Unit ASR Arduino Library
• Unit ASR UiFlow1 Docs
• Unit ASR UiFlow2 Docs
• Unit ASR Preloaded Commands

Package Contents

• 1x Unit ASR
• 1x Grove cable (20cm)