Yu Assistant - Application Documentation

Overview

Yu: Your Virtual Clone Assistant is a React Native mobile application that serves as a personal AI assistant with capabilities in vision, voice, translation, and device control.

Table of Contents

1. Getting Started
2. Application Structure
3. User Guide
4. Development Guide
5. Configuration
6. Troubleshooting

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Getting Started

Prerequisites

• Node.js 18+ installed
• npm or yarn package manager
• Expo CLI installed globally: npm install -g expo-cli
• Expo Go app installed on iOS/Android device (for testing)
• TypeScript knowledge (recommended)

Installation

1. Clone the repository

   git clone <repository-url>
   cd Yu

2. Install dependencies

   npm install

3. Start the development server

   npm start

4. Run on device

   • Scan QR code with Expo Go app (iOS/Android)
   • Or press i for iOS simulator, a for Android emulator

Available Scripts

# Start development server
npm start

# Start with cache cleared
npm start:clean

# Run on Android
npm run android

# Run on iOS
npm run ios

# Run on Web
npm run web

# Run tests
npm test

# Lint code
npm run lint

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Application Structure

Yu/
├── src/
│   ├── screens/          # Screen components
│   │   ├── HomeScreen.tsx
│   │   ├── ProfileScreen.tsx
│   │   ├── ProfileSetupScreen.tsx
│   │   ├── ChatScreen.tsx
│   │   ├── TranslateScreen.tsx
│   │   └── YuVisionScreen.tsx
│   ├── components/       # Reusable components
│   │   ├── YuOrb.tsx
│   │   └── AudioVisualization.tsx
│   ├── theme/            # Theme configuration
│   │   ├── colors.ts
│   │   ├── typography.ts
│   │   └── index.ts
│   └── utils/            # Utility functions
│       └── speech.ts
├── assets/               # Images, fonts, etc.
├── docs/                  # Documentation
├── App.tsx               # Main app component
├── index.js              # Entry point
├── package.json          # Dependencies
├── tsconfig.json         # TypeScript config
├── babel.config.js       # Babel config
└── metro.config.js       # Metro bundler config

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User Guide

Home Screen

The Home Screen is your main interaction hub.

Features:

• Yu Orb: Tap to start listening, long press for profile
• Quick Actions: Access Yu-Vision, Yu-Voice, Yu-Translate, Yu-Control
• Listening Mode: Tap the orb to activate voice input
• Responses: Yu responds with voice and text

How to Use:

1. Tap the Yu Orb to start listening
2. Wait for the 3-second listening period
3. Yu will respond with voice and text
4. Use quick action cards to navigate to specific features

Profile Screen

Customize your Yu experience.

Features:

• Name Setup: Set your name for personalization
• Personality Selection: Choose how Yu communicates
  • Assistant: Formal and helpful
  • Friend: Casual and empathetic
  • Expert: Technical and efficient
  • Minimalist: Quiet and unobtrusive
• Presence Level: Control Yu's activity level
  • Full Yu: Complete interaction
  • Quiet Yu: Notifications only
  • Shadow Yu: Passive learning
  • Off: Complete privacy
• Settings: Access notifications, privacy, voice, and help

How to Use:

1. Long press the Yu Orb from Home Screen
2. Set your name in the input field
3. Select your preferred personality
4. Choose your presence level
5. Access settings as needed

Chat Screen

Have conversations with Yu.

Features:

• Text Messaging: Type messages to Yu
• Voice Input: Use microphone button for speech-to-text
• Recording: Visual feedback during recording
• AI Responses: Yu responds with contextual answers
• Camera Access: Navigate to Yu-Vision from header

How to Use:

1. Navigate from Home Screen → Yu-Control
2. Type a message or tap microphone to record
3. Recording card appears with visualization
4. Stop recording or wait for auto-stop
5. Text appears in input field
6. Send message to get Yu's response

Translate Screen

Translate text and speech between languages.

Features:

• Language Selection: Choose source and target languages
• Text Translation: Type or paste text to translate
• Voice Translation: Record audio for speech-to-text translation
• Voice Playback: Hear translated text
• Copy to Clipboard: Copy translated text
• Quick Phrases: One-tap common phrase translation
  
  
  

Supported Languages:

• English 🇺🇸
• Spanish 🇪🇸
• French 🇫🇷
• German 🇩🇪
  
  

How to Use:

1. Navigate from Home Screen → Yu-Translate
2. Select source and target languages
3. Enter text or record audio
4. Tap Translate button
5. View translated text
6. Use sound button to hear translation
7. Use copy button to copy to clipboard

Yu-Vision Screen

Use camera for visual intelligence.

Features:

• Camera View: Real-time camera preview
• Capture: Take photos for analysis
• Flashlight: Toggle camera flash
• Analysis: Yu provides voice analysis of captured images

How to Use:

1. Navigate from Home Screen → Yu-Vision
2. Point camera at object or scene
3. Tap capture button
4. Listen to Yu's analysis
5. Use flashlight button for low-light conditions

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Development Guide

Code Style

• Language: TypeScript
• Formatting: Follow ESLint rules
• Naming: PascalCase for components, camelCase for functions
• File Structure: One component per file

Adding New Screens

1. Create screen component in src/screens/
2. Add to navigation in App.tsx
3. Update navigation types if needed
4. Add screen to documentation

Adding New Components

1. Create component in src/components/
2. Export from component file
3. Use TypeScript interfaces for props
4. Follow existing component patterns

Theme Customization

Edit src/theme/colors.ts and src/theme/typography.ts to customize:

• Color palette
• Typography styles
• Component themes

Testing

Currently, testing is manual. Future enhancements will include:

• Unit tests (Jest)
• Component tests (React Native Testing Library)
• E2E tests (Detox)

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Configuration

Expo Configuration

Edit app.json for:

• App name and version
• Icons and splash screens
• Permissions
• Platform-specific settings

Metro Bundler

Edit metro.config.js for:

• Asset resolution
• Module resolution
• Cache configuration

TypeScript

Edit tsconfig.json for:

• Compiler options
• Path aliases
• Type definitions

Environment Variables

Currently, no environment variables are used. Future backend integration will require:

• API endpoints
• API keys
• Feature flags

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Troubleshooting

Common Issues

1. Metro Bundler Errors

Problem: Build errors or cache issues

Solution:

npm start:clean
# Or
npx expo start --clear

2. Module Not Found

Problem: Missing dependencies

Solution:

npm install
# Or
npx expo install --fix

3. TypeScript Errors

Problem: Type errors

Solution:

• Check tsconfig.json configuration
• Ensure all types are imported correctly
• Run npm run lint to identify issues

4. Camera Permission

Problem: Camera not working

Solution:

• Check device permissions
• Ensure expo-camera is properly installed
• Check app.json permissions

5. Speech Not Working

Problem: Text-to-speech not playing

Solution:

• Check device volume
• Ensure expo-speech is installed
• Check for errors in console

Debugging

Enable Debug Mode

npm start
# Press 'j' to open debugger

View Logs

• React Native Debugger
• Expo DevTools
• Device console logs

Performance

• Use React DevTools Profiler
• Monitor bundle size
• Check for memory leaks

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Platform-Specific Notes

iOS

• Requires iOS 13+
• Camera permissions required
• Speech synthesis available

Android

• Requires Android 6.0+
• Camera permissions required
• Speech synthesis available

Web

• Limited camera support
• Speech synthesis via Web Speech API
• Some features may not work

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Security Considerations

Current Implementation

• No user authentication
• No data persistence
• No network requests
• All data is local

Future Security Requirements

• Secure API communication
• Encrypted data storage
• User authentication
• Privacy controls
• Data encryption

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Performance

Current Performance

• Initial load: < 3 seconds
• Screen transitions: Smooth
• Animations: 60 FPS
• Memory usage: Optimized

Optimization Tips

• Use React.memo for expensive components
• Lazy load screens if needed
• Optimize images
• Minimize re-renders

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Support

Documentation

• Feature Documentation
• Component API
• Architecture

Issues

• Check Issues Documentation for known issues
• Report bugs via GitHub Issues
• Check Expo documentation for platform-specific issues

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Last Updated: December 2025
Version: 1.0.0