#include <Servo.h>

Servo tap_servo;

const int sensor_pin = A0;
const int tap_servo_pin = 5;

void setup()
{
  tap_servo.attach(tap_servo_pin);
}

void loop()
{
  int val = analogRead(sensor_pin);

  if (val < 600)
  {
    tap_servo.write(0);
  }
  else
  {
    tap_servo.write(90);
  }

  delay(100);  // slow down the sketch
}