//How to read a switch? (or a digital input pin) 

void setup()
{
  Serial.begin(115200);
  pinMode(2,INPUT);    // Set PIN 2 to be an INPUT
}


void loop()
{
  int switchVariable = digitalRead(2);     //read the value of pin 2
  Serial.println(switchVariable);          //print the value to the serial monitor
  delay(10);            //Short delay so that we don't send too much serial data!
}