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

2025-04-07T18:10:16+01:00

Price: 8.20

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)