void setup() {
  // put your setup code here, to run once:
  pinMode(9, INPUT);
  pinMode(7, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int i;
  i=digitalRead(9);
  Serial.println(i);
  if(i == LOW){
    digitalWrite(7,HIGH);
  }
  else{
    digitalWrite(7, LOW);
  }
}