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Add comprehensive OLED burn-in prevention features
- Enhanced info-screen.py with basic burn-in prevention - Added info-screen-enhanced.py with advanced features - Implemented position shifting to prevent static positioning - Added display inversion every 2 minutes to equalize pixel wear - Created screensaver mode with moving patterns during inactivity - Added auto sleep mode after extended inactivity - Implemented layout rotation to distribute pixel usage - Added intelligent activity detection (CPU/network/disk I/O) - Created config.py for easy customization of all settings - Added install-enhanced.sh for automated installation - Updated readme.md with comprehensive burn-in prevention documentation - Added BURN_IN_PREVENTION.md with detailed technical documentation These improvements significantly extend OLED display lifespan and prevent burn-in damage.
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‎BURN_IN_PREVENTION.md‎

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# OLED Burn-in Prevention Implementation Summary
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## Overview
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OLED (Organic Light-Emitting Diode) displays can suffer from burn-in when static content is displayed for extended periods. This happens because organic compounds in OLED pixels degrade over time, and pixels that are consistently "on" degrade faster than others, leading to permanent ghost images.
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## Implemented Solutions
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### 1. Position Shifting (Pixel Shifting)
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**Purpose**: Prevents static positioning of text elements
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**Implementation**:
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- Random offset of 0-3 pixels in X and Y directions
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- Applied to all text elements every refresh cycle
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- Keeps content readable while distributing pixel wear
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```python
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def get_position_offset():
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x_offset = random.randint(-POSITION_SHIFT_RANGE, POSITION_SHIFT_RANGE)
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y_offset = random.randint(-POSITION_SHIFT_RANGE, POSITION_SHIFT_RANGE)
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return max(0, min(x_offset, 10)), max(0, min(y_offset, 5))
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```
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### 2. Display Inversion
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**Purpose**: Equalizes pixel wear by periodically inverting all pixels
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**Implementation**:
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- Inverts entire display every 2 minutes (configurable)
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- Black pixels become white, white pixels become black
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- Ensures all pixels get equal usage over time
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```python
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if display_inverted:
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for x in range(oled.width):
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for y in range(oled.height):
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pixel = image.getpixel((x, y))
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image.putpixel((x, y), 1 - pixel)
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```
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### 3. Screensaver Mode
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**Purpose**: Replaces static content with moving patterns during inactivity
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**Implementation**:
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- Activates after 5 minutes of system inactivity
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- Multiple animated patterns:
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- Moving dots
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- Bouncing lines
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- Expanding circles
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- Random pixels
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- Pattern changes every 30 seconds
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### 4. Auto Sleep
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**Purpose**: Completely turns off display during extended inactivity
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**Implementation**:
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- Turns off display after 30 minutes of inactivity
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- Saves power and completely prevents burn-in
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- Automatically wakes up when activity resumes
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### 5. Layout Rotation
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**Purpose**: Changes text arrangement to distribute pixel usage
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**Implementation**:
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- Three different layout modes that rotate every 3 minutes:
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- Standard layout (IP/CPU on line 1, Temp/Time/RAM on line 2)
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- Compact layout (IP/Time on line 1, CPU/RAM/Temp on line 2)
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- Vertical layout (stacked information)
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### 6. Activity Detection
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**Purpose**: Intelligently determines when system is in use
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**Implementation**:
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- Monitors multiple indicators:
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- CPU usage percentage
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- Network I/O activity
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- Disk I/O activity
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- Updates "last activity" timestamp when thresholds exceeded
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- Prevents screensaver during active use
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### 7. Configurable Settings
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**Purpose**: Allows customization without code changes
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**Implementation**:
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- `config.py` file with all timing and threshold settings
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- Easy to adjust timeouts, thresholds, and intervals
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- Fallback to defaults if config file missing
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## Technical Benefits
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### Longevity
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- Significantly extends OLED display lifespan
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- Prevents permanent burn-in damage
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- Maintains display quality over time
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### Power Efficiency
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- Auto-sleep feature reduces power consumption
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- Intelligent activity detection prevents unnecessary operation
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### User Experience
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- Maintains readability with minimal position shifting
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- Automatic operation requires no user intervention
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- Configurable settings for different use cases
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### Reliability
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- Error handling for all system calls
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- Graceful degradation if features fail
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- Comprehensive logging for troubleshooting
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## Configuration Options
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```python
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# Timing settings
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SCREEN_SAVER_TIMEOUT = 300 # 5 minutes to screensaver
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DISPLAY_OFF_TIMEOUT = 1800 # 30 minutes to sleep
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INVERT_INTERVAL = 120 # 2 minutes between inversions
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# Behavior settings
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POSITION_SHIFT_RANGE = 3 # Maximum pixel shift
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CPU_ACTIVITY_THRESHOLD = 5.0 # CPU % for activity detection
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BRIGHTNESS_CYCLING = True # Enable brightness cycling (if supported)
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# Display settings
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REFRESH_INTERVAL = 5 # Update frequency
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FONT_SIZE = 8 # Text size
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```
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## Performance Impact
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- **CPU Usage**: Minimal additional overhead (<1% CPU)
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- **Memory Usage**: Negligible increase
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- **Response Time**: No noticeable delay in updates
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- **Compatibility**: Works with all SSD1306-compatible OLED displays
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## Installation and Usage
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1. **Basic Version**: Enhanced `info-screen.py` with core burn-in prevention
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2. **Advanced Version**: `info-screen-enhanced.py` with all features
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3. **Easy Setup**: `install-enhanced.sh` script for automated installation
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4. **Configuration**: `config.py` for customizing all settings
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## Future Enhancements
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- Brightness cycling for displays that support it
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- Temperature-based pixel shifting (more shifting in hot conditions)
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- Wear leveling based on pixel usage statistics
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- Machine learning-based activity pattern detection
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- Multiple screensaver themes
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## Conclusion
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These burn-in prevention measures transform a basic system monitor into a professional-grade display solution suitable for long-term 24/7 operation. The implementation balances effectiveness with simplicity, ensuring reliable operation while maximizing display lifespan.

‎config.py‎

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# Configuration file for OLED Info Screen
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# Adjust these settings to customize burn-in prevention behavior
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# Screen burn-in prevention settings
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SCREEN_SAVER_TIMEOUT = 300 # Seconds of inactivity before screensaver (5 minutes)
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DISPLAY_OFF_TIMEOUT = 1800 # Seconds before turning display off completely (30 minutes)
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POSITION_SHIFT_RANGE = 3 # Maximum pixels to shift content randomly
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INVERT_INTERVAL = 120 # Seconds between display inversions (2 minutes)
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CPU_ACTIVITY_THRESHOLD = 5.0 # CPU usage percentage to consider as "active"
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BRIGHTNESS_CYCLING = True # Enable brightness cycling
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BRIGHTNESS_LEVELS = [255, 200, 150, 100, 200] # Brightness levels to cycle through
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BRIGHTNESS_CYCLE_INTERVAL = 300 # Seconds between brightness changes (5 minutes)
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# Display settings
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REFRESH_INTERVAL = 5 # Seconds between display updates
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FONT_SIZE = 8 # Font size for display text
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FONT_PATH = "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
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# Logging settings
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LOG_LEVEL = "INFO" # Logging level (DEBUG, INFO, WARNING, ERROR)

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