Exercise: Digital Read Serial
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Fast DigitalRead(), DigitalWrite() for Arduino : 5 Steps (with Pictures) - Instructables
Arduino project: read a digital input
Pin Change Interrupts - Difference in PORT Read & DigitalRead - Programming Questions - Arduino Forum
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How to Use the Arduino's Digital I/O - Projects
Fast DigitalRead(), DigitalWrite() for Arduino : 5 Steps (with Pictures) - Instructables
How to Use the Arduino's Digital I/O - Projects
Digital Read Serial | Arduino Documentation
The Basics of Arduino: Reading Switch States
Digital Read Serial | Arduino Documentation
Arduino project: read a digital input
What is an Arduino? - SparkFun Learn
Multiple Push Buttons on One Arduino Input | The DIY Life
Arduino digitalRead() and analogRead() functions - Electronics fun
Digital Read in Arduino
