Automatic Door Handle/Knob Sanitizer for COVID-19🚫🦠🚪😷

1#include <Servo.h>
2
3Servo myservo; 
4int pos;
5int Signal =  8;
6int LastState = LOW; 
7int SensorState;
8
9void setup() 
10{
11  pinMode(Signal,  INPUT);         //Sensor set as digital input
12  myservo.attach(9);              //Server  set as output
13}
14
15void loop()
16{
17
18  
19  SensorState = digitalRead(Signal);  
20  delay(1); 
21
22   if (SensorState != LastState) //if it changed and it's  high
23  {
24    if (SensorState == HIGH) 
25    {
26      Spray();                  //Sanitize  the door handle
27    }
28  }
29LastState = SensorStat;
30//save current sensor  input value for next comparison 
31
32}
33
34void Spray()                    //spray  operation function 
35{   
36   delay(200);
37   for ( ;pos >= 40; pos -= 1)  
38   { 
39    myservo.write(pos);             
40    delay(15);                        
41   } 
42   
43    for ( ;pos <= 80; pos += 1) 
44  { 
45    myservo.write(pos);             
46    delay(5);                        
47  }
48}
49//end program
50