Offline voice-controlled quadruped

A compact four-legged robot with offline voice recognition and a 2.4 GHz remote, designed for education, prototyping and interactive displays. It responds to a wake word and fixed voice commands and can walk, turn, sit and stand. The team did the mechanical design, a custom control board and the firmware.

Pink-and-white 3D-printed four-legged robot, angled view, with a speaker grille, a microphone and a sticker on the lid, on a white background — Robot, angled view

Tech stack

Main controller: STM32 on a custom control board
Voice: Offline wake word and predefined voice commands
Audio: Microphone and speaker for voice feedback and status prompts
Actuators: 4 legs driven by multiple servos
Wireless: 2.4 GHz remote control
Power: 2S Li-ion battery (7.4 V) with voltage monitoring
Structure: 3D-printed body, four-leg linkage

What we built

Mechanical design: compact 3D-printed structure, four-leg linkage, modular assembly
Custom control board: servo interfaces, power management, microphone, speaker, buttons, battery monitoring
Embedded software: servo and gait control, offline voice command recognition, 2.4 GHz remote receiver, predefined action library
System integration and debugging

Development time

20 days

Photos and design files

Front-angled view of the pink quadruped showing the power switch, speaker and lid sticker, on white — Front view with power switch

Top view of the lid

Pink quadruped seen from the other side, standing, on a white background — Side-angled view

Underside of the pink quadruped showing a black two-cell battery holder between the legs — Underside with battery holder

Close-up of one pink leg joint with its black lower leg, on white — Leg joint detail

All builds →

Building something similar?

Review my project

Or email [email protected] · WhatsApp +1 (323) 719-3730