Flower dropping AIR train

1//YouTube|Tech at Home
2
3double ch1=2;
4int a=4; int b=5;
5 
6double  ch2=3;
7int c=6; int d=7;
8
9
10void setup()
11{
12  Serial.begin(9600);
13  
14  pinMode(2,INPUT);
15  pinMode(4,OUTPUT); pinMode(5,OUTPUT);
16  
17  pinMode(3,INPUT);
18  pinMode(6,OUTPUT); pinMode(7,OUTPUT);
19  
20}
21
22void loop()
23{
24ch1  = pulseIn(2,HIGH);
25ch2 = pulseIn(3,HIGH);
26
27if((ch1==0)&&(ch2==0))
28{     
29 digitalWrite(a,LOW); digitalWrite(b,LOW);
30 digitalWrite(c,LOW);digitalWrite(d,LOW);
31}
32
33else  if((ch1>1530)&&(ch2>1530))
34{     
35digitalWrite(a,HIGH); digitalWrite(b,LOW);
36  digitalWrite(c,LOW);digitalWrite(d,HIGH);    
37}
38
39else if((ch1>1530)&&(ch2<1460))
40{  
41   digitalWrite(a,HIGH); digitalWrite(b,LOW);
42 digitalWrite(c,HIGH);digitalWrite(d,LOW);    
43
44}
45
46else if((ch1<1460)&&(ch2>1530))
47{     
48  digitalWrite(a,LOW);  digitalWrite(b,HIGH);
49 digitalWrite(c,LOW);digitalWrite(d,HIGH);
50}
51
52else  if((ch1<1460)&&(ch2<1460))
53{  digitalWrite(a,LOW); digitalWrite(b,HIGH);
54  digitalWrite(c,HIGH);digitalWrite(d,LOW);
55  
56
57}
58
59else
60{     
61  digitalWrite(a,LOW); digitalWrite(b,LOW);
62 digitalWrite(c,LOW);digitalWrite(d,LOW);
63}
64
65}