Reads the value from a specified pin, it will be either HIGH or LOW.
pin: the number of the pin you want to read. It has to be one of the digital pins of the board, thus it should be a number between 0 and 13. It could also be a variable representing a value in that range.
int ledPin = 13; // LED connected to digital pin 13
int inPin = 7; // pushbutton connected to digital pin 7
int val = 0; // variable to store the read value
void setup()
{
pinMode(ledPin, OUTPUT); // sets the digital pin 13 as output
pinMode(inPin, INPUT); // sets the digital pin 7 as input
}
void loop()
{
val = digitalRead(inPin); // read the input pin
digitalWrite(ledPin, val); // sets the LED to the button's value
}
Sets pin 13 to the same value as the pin 7, which is an input.