void setup() {
  // put your setup code here, to run once:
pinMode(2, INPUT);
pinMode(7, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 if(digitalRead(2)==HIGH){
   Serial.println("on");
   digitalWrite(7, HIGH);
 }
 else{
   Serial.println("off");
   digitalWrite(7, LOW);
 }
 delay(100);
}