Arduino - String Comparison - YouTube
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peviousMillis' was not declared in this scope - Installation & Troubleshooting - Arduino Forum
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SafeString Alternative to Arduino Strings for Beginners : 16 Steps - Instructables
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2.5 Understanding Strings in Arduino
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SafeString Alternative to Arduino Strings for Beginners : 16 Steps - Instructables
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4. Serial Communications - Arduino Cookbook [Book]
3.2 Getting user input from the serial monitor with Arduino
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4. Serial Communications - Arduino Cookbook [Book]
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2.5 Understanding Strings in Arduino
String Addition Operator | Arduino Documentation | Arduino Documentation
