Stellar Vision V1 – The Affordable Braille Console in World !!

Stellar Vision V1 is a next-generation assistive Braille input solution created to enhance the independence of visually impaired users by integrating accurate hardware design, intelligent software processing, and reliable wireless connectivity.

The system features a compact 14-key Braille keyboard, AI-driven assistance, HID-based typing, optical character recognition (OCR), real-time audio feedback, and a fully wireless file management framework.

Project Overview

Stellar Vision V1 is a portable, multi-purpose assistive console that merges Braille-based user input with advanced digital functionality. Powered by the ESP32 platform and associated peripheral modules, the device supports high-speed Braille typing, AI-powered queries, document OCR, wireless file handling, gesture-based navigation, and emergency communication features.

Key Features

• 14-key Braille input interface with precise 6-dot pattern recognition for accurate character entry
• AI-powered assistance enabling real-time question answering via the Gemini API
• Multi-modal user feedback, including audio prompts, haptic vibration, and text-to-speech (TTS) output
• HID keyboard emulation using DigiSpark for seamless interaction with computers and mobile devices
• SOS emergency alert system capable of sending SMS notifications through Twilio
• Wireless file upload and management system for independent data handling
• Single-hand gesture control mode implemented using the MPU6050 motion sensor
• Optical Character Recognition (OCR) mode for extracting readable text from images and PDF documents
• SD card storage support for notes, audio files, and system logs
• Over-the-Air (OTA) firmware update capability for continuous feature upgrades
• Deep-sleep–optimized power management to maximize energy efficiency and extend operating time

Please refer to the User Manual for complete operational details — it documents every feature in depth.

The Stellar Vision V1 User Manual is available for download on the official GitHub repository User manual

How Each Mode Assists Visually Impaired Users

1. Perkins Mode

Core Objective

• Enables direct, real-time interaction with computers and digital platforms using Braille input.

User Capabilities

• Compose and send emails independently
• Participate in online examinations
• Write source code, including special characters (<, >, (), #)
• Browse the internet efficiently
• Perform general computer-based tasks without visual assistance

Accessibility Enhancements

• Optional read-aloud feedback activated through a long-press action
• Full typing autonomy, supporting numbers, capital letters, and symbols
• Automatic text correction to improve typing speed and confidence

Input System Architecture

• 14-key Braille input interface with accurate 6-dot pattern recognition
• Four dedicated navigation keys for menu traversal and mode switching
• Dual space buttons designed for ergonomic and efficient typing
• CTRL modifier key enabling HID shortcut functions (copy, paste, etc.)
• Backspace key for standard character deletion

2. Notification Mode

Functionality

• Enables seamless synchronization with a mobile device to deliver notifications through distinct vibration patterns.

Notification Handling

• Notifications are announced using custom haptic vibration cues
• Designed for non-audio, discreet alerts

Storage Mechanism

• All received notifications are automatically stored on the SD card using the format:

App: [Application Name] [Timestamp]
Msg: [Title] [Message Content]

• Clears outdated notifications during system startup
• Stored alerts can be reviewed later using SD Reader Mode

3. NoteMaker Mode

Purpose

• Facilitates independent and efficient note-taking for visually impaired users.

Common Use Cases

• Academic note-taking
• Recording event information
• Personal writing and journaling

Core Features

• Notes are securely saved to the SD card
• Instant audio feedback via text-to-speech (TTS)
• Automatic text correction to improve writing accuracy and confidence

4. SD Card Mode

Capabilities

Allows users to access and manage stored data directly from the SD card, including:

• Text files
• Notes and documents
• Images and media files

OCR Functionality (B-Drive Mode)

• Converts printed book pages into readable digital text
• Provides spoken audio output for extracted content
• Supports text extraction from images and PDF documents

Additional Utilities

• Built-in audio player for podcasts, audiobooks, and user recordings

5. Gemini AI Mode

AI Capabilities

• Intelligent assistance powered by Gemini AI 2.0
• Supports real-time question answering across multiple domains
• Automatically saves question–answer sessions to the SD card

Feedback Mechanism

• Audio announcements
• Haptic vibration signals
• Text-to-speech (TTS) responses
• Custom audio cues for enhanced interaction

6. HID Shortcut Mode

Automation Features

• Provides single-key automation for frequently used digital tools, including:
• Wi-Fi enable/disable
• Google Chrome browser
• Gmail
• ChatGPT
• Online Python IDE
• Digital library platforms

This mode significantly reduces interaction complexity and accelerates workflow.

7. SD Upload Mode

Wireless File Management

Enables full file control without removing the SD card.

Supported Operations

• Browse directory structure
• Upload and download files
• Delete unnecessary files

Key Advantages

• Wireless upload via built-in web interface
• Supports text documents, audio files, and study materials
• Promotes complete independence in managing digital resources

8. OTA Update Mode

Update System

• Supports wireless over-the-air (OTA) firmware updates
• Ensures smooth and interruption-free upgrades

Benefits

• Continuous feature enhancement
• Bug fixes without physical access
• Long-term device scalability and reliability

9. SOS Emergency Mode

Safety Mechanism

Provides an immediate safety response during critical or unsafe situations.

Key Functions

• Sends an emergency SMS alert via Twilio to a predefined contact
• Activated through a dedicated space-button press
• Functions as a reliable protection layer for users during emergencies
• This feature ensures quick communication without requiring visual or complex interaction.

10. One-Hand Gesture Mode

Usage Overview

Designed for users who prefer minimal physical interaction or single-hand operation.

Functionality

• Utilizes the MPU6050 motion sensor to switch between modes
• Requires minimal hand movement
• Significantly reduces physical effort and accelerates navigation

This mode improves accessibility for users with limited mobility or fatigue.

11. Audio Player Mode

Purpose

Enables audio-based learning and content consumption.

Supported Use Cases

• Playback of educational podcasts
• Audiobooks for academic and leisure reading
• Personal voice recordings

This mode is especially useful during extended study sessions and hands-free learning.

12. Sleep Mode

Power Management System

Optimized for energy efficiency and extended operational time.

Features

• Automatically enters sleep after 30 seconds of inactivity
• Employs deep-sleep power optimization to reduce consumption
• Temporarily disabled in modes requiring continuous operation
• (e.g., SD Upload Mode and B-Drive OCR Mode)
• This ensures battery efficiency without disrupting critical tasks.

HID Keyboard & Controller Architecture

Current Implementation

• Uses DigiSpark (ATtiny85) for stable and reliable HID keyboard output
• Enables seamless Braille-to-keyboard translation for computers

Planned Enhancement

• Migration to ESP32-S3 to improve native HID handling
• Intended to resolve existing I²C and I²S resource conflicts
• Will reduce dependency on external HID controllers

Future Expansion

Planned Feature

• Integration of an AI voice agent using an I²S microphone
• This enhancement will enable voice-based interaction, further reducing reliance on physical input.

Web Interface Features

1. B-DRIVE OCR System

Web-Based OCR Platform

• Built-in web server accessible from any modern browser
• Simple drag-and-drop interface for image and PDF uploads
• Supports JPG, PNG, and PDF formats

OCR Processing

• Powered by the OCR.space API for accurate text extraction
• Automatically converts uploaded documents into readable text

User Feedback

Haptic vibration alert notifies the user upon completion of processing

2. SD Upload Mode (Web Interface)

• Wireless File Management System
• Accessible via a clean web dashboard at:

 http://[device-ip]:8080

Features

• Upload, download, delete, and browse files wirelessly
• Supports entire folder uploads with nested directory structures
• Real-time upload progress indicators
• Operates entirely on a local Wi-Fi network (no internet required)
• Accessibility Advantage
• Fully mobile-friendly interface
• Works seamlessly on smartphones, tablets, and desktop browsers
• 

Image of the Components used : 

3D MODEL :

I developed the complete hardware prototype in six days and built a custom, feature-rich firmware that surpasses the capabilities of many existing assistive devices available on the market. Most commercial solutions are overpriced, and several technologies they use are not affordable for common users.

Let us now compare my device with a leading product from one of the top Braille reader manufacturers.

Prototype Model :

Final Product : 

The firmware development and stabilization process spanned almost one month. This project stands as a comprehensive and original guide to designing advanced assistive technology, with limited or no comparable resources currently available on the web.

3D MODEL

You can use the following circuit resources to build the hardware:

Complete Circuit Diagram (PDF):

Complete Circuit Diagram 

Detailed GPIO Expander (PCF8575) Wiring Guide:

Detailed GPIO Expander (PCF8575) Wiring Guide

Dedicated Markdown File for the Entire Circuit Connection:

Full Circuit Connection Markdown File

A detailed comparison for this hardware section is provided below:

Products That Can Be Replaced by Stellar Vision V1 (Current Capability)

As of now, Stellar Vision V1 is capable of replacing the following commercially available assistive devices:

Orbit Writer – $149 (₹13,433.38)

Orbit Speak Plus – $749 (₹67,527.52)

Orbit Speak – $599 (₹54,003.98)

Orbit Speak Standard – $199 (₹17,941.22)

Upcoming Hardware & Software Enhancements (Minimal Feature List)

The following upgrades are currently under active development and will significantly enhance usability, performance, and accessibility:

• 
  
• Audio bookmark system inspired by direct feedback from visually impaired users
• Firmware migration from Arduino framework to ESP-IDF
• I²S microphone integration to enable a built-in voice assistant
• Rubber-dome key switches for improved tactile feedback
• USB Type-A female port for direct HID keyboard connectivity
• mmWave presence sensor for advanced safety and context awareness
• 3.5 mm TRRS audio jack for external audio devices
• Refreshable Braille display based on Vijay Varada’s electromechanical module
• Hackaday project reference
• Migration to ESP32-S3 processor
• 5000 mAh battery system for extended operation
• Custom-designed PCB and a newly engineered ergonomic enclosure
• SPIFFS-based internal storage system
• Low-power tilt sensor for intelligent mode control

How to built it ?

Here is the two dedicated Files to explain that !!

• Build instructions : Link
• Audio Files Expansion : Link

🎉 Congratulations! Your Stellar Vision device is now ready to use.

For support and updates, visit the official repository:

Stellar Vision V1 – GitHub

If you feel to get more details about the Functionality of Modes Check this out !!

Note: The Stellar Vision V1 firmware is protected under the PolyForm Noncommercial License.

It is intended for personal or educational use only.

Do not copy, distribute, or misuse it for commercial purposes.

Author :

Maathes Thilak K

Embedded Systems & Robotics Enthusiast

Bachelor of Engineering – Electronics & Communication Engineering

2nd Year Student, Madras Institute of Technology (MIT), Anna University, Chennai, India

Connect With Me

Email: maathesthilaklin2006@gmail.com

LinkedIn: Maathes Thilak K

GrabCAD: Profile Link

GitHub: MAATHES-THILAK-K