Gravity Offline Voice Recognition Module DF2301Q I2C and UART

This Gravity voice recognition module from DFRobot recognises voice commands offline, i.e. without an internet connection and without a cloud. It knows 121 fixed English command words and learns up to 17 custom commands; any word in any language and any sound can serve as a command. Two microphones, a speaker for feedback and the I2C and UART interfaces are on the board. The module recognises keywords, it does not convert free speech into text.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces
• Gravity IO Expansion Shield for Arduino V7.1

Features:

• 121 fixed command words (English) and the fixed wake word «Hello Robot»
• 17 custom command words and one custom wake word can be learned, learning and deleting by voice command without programming
• Two microphones for better noise suppression and greater range
• Speaker on the board and connector for an external speaker
• Power indicator red, recognition indicator blue
• I2C or UART via the 4-pin Gravity connector, selected with a slide switch
• Library for Arduino, examples for micro:bit MakeCode and Mind+

Application Examples:

• Switching lights, windows and devices by voice command
• Toys and robots with voice control
• Triggering by learned sounds, for example on an automatic feeder
• Voice control in places without a network, without conversations going to a cloud

Documentation:

• Wiki DFRobot SEN0539-EN
• Getting started: learning wake word and commands (DFRobot Wiki)
• Example code I2C for Arduino (DFRobot Wiki)
• GitHub library DFRobot_DF2301Q

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0539-EN
• Voice recognition chip: DF2301Q
• Operating voltage: 3.3 to 5 V
• Operating current: max. 370 mA at 5 V
• Interface: I2C or UART
• I2C address: 0x64
• Fixed command words: 121, fixed wake word: 1
• Custom command words: 17, learning command: 1
• Microphone sensitivity: -28 dB
• Operating temperature: 0 to 70 °C
• Version: V1.1 from May 2025 with plug-in speaker and additional mounting holes, V1.0 with soldered speaker
• Dimensions: 49 × 32 × 8 mm
• Weight: 25 g

Scope of Delivery:

• 1× Gravity offline voice recognition module DF2301Q
• 1× Gravity cable I2C/UART 4-pin, PH2.0 to Dupont female, 30 cm