#include <Servo.h>
Servo myservo;
const int analogInPin = A0;
const int relayPin = 9;
int sensorValue = 0;

void setup() {
  Serial.begin(9600);
  pinMode(relayPin,OUTPUT);
  digitalWrite(relayPin,0);
  myservo.attach(7);
  myservo.write(0);
  delay(1000);
  myservo.detach();
}
void loop() {
  sensorValue = analogRead(analogInPin);
  if (sensorValue < 1000) {
    digitalWrite(relayPin,1);
    myservo.attach(7);
    delay(500);
    myservo.write(90);
    delay(500);
    myservo.detach();
  }
  else {
    digitalWrite(relayPin,0);
    myservo.attach(7);
    delay(500);
    myservo.write(0);
    delay(500);
    myservo.detach();
  }
  Serial.print("sensor = ");
  Serial.println(sensorValue);
}