Home
Shop
Sensors
Voice Recognition
Gravity: Offline Voice Recognition Sensor - I2C & UART

Skip to the beginning of the images gallery

Gravity: Offline Voice Recognition Sensor - I2C & UART

Rating:

93% of 100

SKU: SEN0539-EN Brand: DFRobot

Take control of projects with DFRobot’s offline Gravity: Voice and Speech Recognition Sensor. Train any sound as a command and enjoy flexibility with...

$27.90 AUD, inc GST

$25.36 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Tue, 26th of Nov

Quantity Discounts:

10-25 $24.35 (exc GST)
25+ $23.59 (exc GST)

This Gravity: Offline Voice Recognition Sensor is built around an offline voice recognition chip, which can be directly used without an internet connection. It comes with 121 built-in fixed command words and supports the addition of 17 custom command words. Any sound could be trained as a command, such as whistling, snapping, or even cat meows, which brings great flexibility to interactive audio projects.

The module features a dual microphone design with better noise resistance and a longer recognition distance, making it relatively accurate and reliable even in noisy environments. It comes with a built-in speaker and an external speaker interface for real-time voice feedback of recognition results. The module uses both I2C and UART communication methods and supports various 3.3V or 5V controllers, including the Arduino UNO, Arduino Leonardo, Arduino MEGA, FireBeetle series, and more.

This voice recognition module provides a reliable and flexible voice interaction solution for makers and electronics enthusiasts, and it can be applied to any applications where voice control or interaction is desirable, such as all kinds of smart home appliances, toys, lamps, and robotics projects.

An important factor in voice recognition is the voice database, which is used as comparative data during the recognition process. Online voice databases are stored in the cloud and have a very large amount of data, while offline voice databases are local and have limited space.

Online vs Offline

Pros

Cons

Offline Speech Recognition

1. Quickly respond to corresponding command words and instructions.

2. No need for a network.

3. If speech recognition fails, it will not affect the use of other product functions.

4. More secure privacy, users don't have to worry about their conversation content being recorded and uploaded to the cloud.

5. Small module size, convenient for embedding in applications.

6. Cheaper price.

Command words are fixed, and there may be limitations on the number and length of words.

Online Speech Recognition

1. Consumers are easy to use and not limited to command words.

2. Easy to develop, and there are many solutions in the market.

1. Requires network connection to connect to the cloud.

2. Response speed depends on the network speed.

3. Higher cost.

Wiring Diagram of Voice Recognition Module, Arduino Uno and LED Light Module - I2C

Figure: Wiring Diagram of Voice Recognition Module, Arduino Uno, and LED Light Module - I2C

Wiring Diagram of Voice Recognition Module, Arduino Uno and LED Light Module - UART

Figure: Wiring Diagram of Voice Recognition Module, Arduino Uno, and LED Light Module - UART

Features

Self-learning function: Control the module to learn command words by the voice, and any audio can be trained as a command
Support I2C and UART, with a Gravity interface
Compatible with 3.3V/5V
Built-in with 121 commonly-used fixed command words
The module has a built-in speaker and an interface for an external speaker, which can provide real-time voice feedback on recognition results
Equipped with power indicator (red) and recognition status indicator (blue)
Dual microphones provide better noise resistance and longer recognition distance
Compatible with Arduino controllers: Arduino UNO, Arduino Leonardo, Arduino MEGA, FireBeetle series controllers, Raspberry Pi, ESP32

Applications

Voice recognition interaction
Voice-controlled terminal
Competition and project development

Specification

Operating Voltage: 3.3 - 5V
Maximum Operating Current: =370 mA (5V)
Communication: I2C/UART
I2C Address: 0x64
Fixed Command: 121
Fixed Wake-up Command: 1
Custom Command: 17
Learning Activation Command: 1
Onboard Microphone Sensitivity: -28db
Module Size: 49×32 mm/1.93×1.26”

Documents

Product wiki

Parts List

Gravity: Voice Recognition Module - I2C & UART x1
Gravity-4P I2C/UART Sensor Connector x1

This product is listed in:

Sensors>Voice Recognition

Product Comments

Start the conversation

Exact shipping can be calculated on the view cart page (no login required).

Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

$3+ for Stamped Mail (typically 10+ business days, not tracked, only available on selected small items)
$7+ for Standard Post (typically 6+ business days, tracked)
$11+ for Express Post (typically 2+ business days, tracked)
Pickup - Free! Only available to customers who live in the Newcastle region (must order online and only pickup after we email to notify you the order is ready). Orders placed after 2PM may not be ready until the following business day.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.

International Orders - the following rates are for New Zealand and will vary for other countries:

$12+ for Pack and Track (3+ days, tracked)
$16+ for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

Have a product question? We're here to help!