int led1 = 2; 
int buttonPin = 3;
int buttonState = 0;
void setup()
{
pinMode(led1, OUTPUT); 
pinMode(buttonPin, INPUT);
digitalWrite(led1, LOW);
}
void loop()
{
buttonState = digitalRead(buttonPin); 
if (buttonState == HIGH) { 
digitalWrite(led1, HIGH); 
}
else { 
digitalWrite(led1, LOW); 
}
}