GRC AI RoboControl - Offline Voice Controller (ESP32-S3)

What It Is

 

GRC RoboControl is a smart voice remote that works entirely offline. It understands commands in English, transmits them via BLE (ESP32-C3), and comes with a built-in IMU sensor so you can steer your robot by simply tilting the board — faster, slower, left, or right.

We’ve prepared ready-to-use examples and configurations for CrowBot, making it easy to start controlling robots by voice or motion right away.

 

Сheck out our open-source Arduino program for the CrowBot-BOLT robot, which is ready to use right out of the box!

We designed it to showcase voice control and tilt-based movement. You can also use it as a reference for your projects, adapt it for other robots and devices, or explore new possibilities with the CrowBot. 

The app isn't limited to CrowBot—you can use it with various robots and devices.

The app provides access to output data, allows you to send commands, manage controls, and process data, making integration and customization easy for your specific tasks and equipment. Refer to the documentation for details: Open-source software component on GitHub

Why You’ll Love It

• Voice commands offline — instant response, no cloud needed.
• Bilingual support — English out of the box.
• Tilt to drive — IMU turns the board into an intuitive joystick.
• BLE connectivity — reliable wireless link with ESP32-C3.
• Bonus firmware — AI Teacher (learn with AI) and VoicePIN (voice-based PIN security).

Perfect For

• CrowBot — ready-made demos included.
• STEM classrooms — students control robots by voice and IMU sensor.
• Competitions — race your robots and track results.
• DIY & makers — build voice-driven gadgets and toys.
• Exhibitions & hackathons — instant wow-factor demo.

In the Box

• 1× GRC RoboControl module
• Quick start guide (links to GitHub & Hackster)
• Bonus firmware: AI Teacher & VoicePIN

Additional free applications

Voice PIN

This application allows the DevBoard to function as an electronic switch that activates when a user says a pre-set voice PIN code consisting of four digits.

Easily create an AI smart lock activated by voice PIN using this GRC AI DevBoard, Electromagnetic Lock, and Crowtail-Relay 2.0.

It’s simple to assemble using the ready-made parts and schematics.

Teacher 3+

This interactive English learning app helps kids learn through pictures, sounds, and simple math (addition and subtraction up to 20). Children say their answers aloud, and AI checks if they're correct. If they need help, they can skip or get a hint with the word and pronunciation.

Check the full description of Apps on Github.

Development Board Overview

Technical Highlights

• MCU: ESP32-S3 (offline AI voice recognition)
• Wireless: ESP32-C3 (BLE)
• Microphones: dual MEMS (noise resistant)
• IMU sensor: built-in motion control for tilt-based driving
• Languages: English / Chinese (switchable)
• Commands: 50+ per set; add more via PC utility (EN / 中文)
• Simultaneous control: up to 3 robots
• Race mode: button-based start/finish with timing
• Latency: ~150 ms
• Interfaces: GPIO, I²C, UART, BLE
• Power: 5 V USB-C or 3.3 V external

Links

•       The full description of Apps on Github

•       Open-source component on GitHub

•       RoboControl Additional Description

•       Open-source Arduino program for the CrowBot-BOLT robot