Plastic seperator

#include <Servo.h>  // include servo.h library

Servo myservo_sensor;//mov
Servo servo;//open close
int pos_sensor = 0;
int soil;
int metel;

void setup() {
  Serial.begin(9600);
  myservo_sensor.attach(8);  //connect servo to pin 8
  myservo_sensor.write(0);
  servo.attach(12);
  servo.write(0);
  pinMode(7, INPUT);  //input pin coming from soil sensor
  pinMode(9, INPUT);  //input pin coming from metel sensor(black wire)
}

void loop() {

  soil = digitalRead(7);
  metel = digitalRead(9);
  Serial.print("waiting");

  if (metel == LOW) {
    Serial.print("metel");
    myservo_sensor.write(40);
    servo.write(90);
    delay(100);
  }
  if (soil == LOW) {
    Serial.print("organic");
    myservo_sensor.write(40);
    servo.write(90);
    delay(100);
  } else {
    Serial.print("plastic");
    myservo_sensor.write(40);
    servo.write(90);
    delay(100);
  }
}