int input_sign;
void setup() {
  // put your setup code here, to run once:
pinMode(5,OUTPUT);
pinMode(A2, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
input_sign = digitalRead(A2);
  if(input_sign){
    digitalWrite(5, HIGH);
  }
  delay(20000);  
}