/*
The program polls a digital pin to see if the button has been pushed, it outputs
either a 0 or 1 every 40 ns. This demostrates the importance of de-bouncing
a switch as it can register multiple unintended presses.
*/
// digital pin 2 has a pushbutton attached to it. Give it a name:
int pushButton = 2;
// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
// make the pushbutton's pin an input:
pinMode(pushButton, INPUT);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input pin:
int buttonState = digitalRead(pushButton);
// print out the state of the button:
Serial.println(buttonState);
delay(40); // delay in between reads for stability
}