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Arduino DigitalWrite Function Guide
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- Basic Functionality
- DigitalWrite controls output from Arduino pins using voltage levels
- Output voltage ranges from 0V (zero) to 5V (one)
- Function requires pinMode() setting to output in setup()
- Arduino pins are numbered for easy identification
- Technical Implementation
- Code checks for PWM, bit mask, and port information
- Converts pin numbers to port addresses and bit masks
- Performs bit manipulation using inversion and logical operations
- Returns void value
- Speed Optimization
- DigitalWrite is slower than direct port access
- Macros provide 17x speed improvement
- Macro code requires unprotected code area
- Useful for real-time control and high-speed data streaming
- Limitations
- Cannot control multiple pins simultaneously
- Output current limits motor control
- Not suitable for high-current applications
- Requires specific hardware for motor control