Plastic seperator

1#include <Servo.h>  // include servo.h library
2
3Servo myservo_sensor;//mov
4Servo  servo;//open close
5int pos_sensor = 0;
6int soil;
7int metel;
8
9void  setup() {
10  Serial.begin(9600);
11  myservo_sensor.attach(8);  //connect servo  to pin 8
12  myservo_sensor.write(0);
13  servo.attach(12);
14  servo.write(0);
15  pinMode(7, INPUT);  //input pin coming from soil sensor
16  pinMode(9, INPUT);  //input pin coming from metel sensor(black wire)
17}
18
19void loop() {
20
21  soil = digitalRead(7);
22  metel = digitalRead(9);
23  Serial.print("waiting");
24
25  if (metel == LOW) {
26    Serial.print("metel");
27    myservo_sensor.write(40);
28    servo.write(90);
29    delay(100);
30  }
31  if (soil == LOW) {
32    Serial.print("organic");
33    myservo_sensor.write(40);
34    servo.write(90);
35    delay(100);
36  }  else {
37    Serial.print("plastic");
38    myservo_sensor.write(40);
39    servo.write(90);
40    delay(100);
41  }
42}