const int buttonPin =5; // the number of the pushbutton pin
const int ledPin = 25; // the number of the LED pin
// variable for storing the pushbutton status 
int buttonState = 0; 
void setup() {
 Serial.begin(9600); 
 // initialize the pushbutton pin as an input
 pinMode(buttonPin, INPUT);
 // initialize the LED pin as an output
 pinMode(ledPin, OUTPUT);
} 
void loop() {
 // read the state of the pushbutton value
 buttonState = digitalRead(buttonPin);
 Serial.println(buttonState);
 // check if the pushbutton is pressed.
 // if it is, the buttonState is HIGH
 if (buttonState == HIGH) {
 // turn LED on
 digitalWrite(ledPin, HIGH);
 } else { 
 // turn LED off
 digitalWrite(ledPin, LOW);
 } 
}