Arduino bluetooth car

1char t;
2 
3void setup() {
4pinMode(3,OUTPUT);   //left motors forward
5pinMode(4,OUTPUT);   //left motors reverse
6pinMode(5,OUTPUT);   //right motors forward
7pinMode(6,OUTPUT);   //right motors reverse
8pinMode(13, OUTPUT);
9pinMode(12, OUTPUT);
10pinMode(11,  OUTPUT);
11Serial.begin(9600);
12 
13}
14 
15void loop() {
16if(Serial.available()){
17  t = Serial.read();
18  Serial.println(t);
19}
20 
21if(t == 'F'){            //move  forward(all motors rotate in forward direction)
22  digitalWrite(6,HIGH);
23  digitalWrite(4,HIGH);
24}
25  
26else if(t == 'B'){      //move reverse (all motors rotate in reverse direction)
27  digitalWrite(5,HIGH);
28  digitalWrite(3,HIGH);
29}
30 
31else if(t == 'L'){      //turn right (left side motors rotate in forward direction, right side motors  doesn't rotate)
32  digitalWrite(4,HIGH);
33}
34 
35else if(t == 'R'){      //turn  left (right side motors rotate in forward direction, left side motors doesn't rotate)
36  digitalWrite(6,HIGH);
37}
38if(t == 'W'){
39  digitalWrite(13, HIGH);
40}
41
42if(t  == 'w'){
43  digitalWrite(13, LOW);
44}
45
46if(t == 'U'){
47  digitalWrite(12,  HIGH);
48  digitalWrite(11, HIGH);
49}
50
51if(t == 'u'){
52  digitalWrite(12,  LOW);
53  digitalWrite(11, LOW);
54}
55
56delay(100);
57}

1char t;
2 
3void setup() {
4pinMode(3,OUTPUT);   //left motors forward
5pinMode(4,OUTPUT);
6   //left motors reverse
7pinMode(5,OUTPUT);   //right motors forward
8pinMode(6,OUTPUT);
9   //right motors reverse
10pinMode(13, OUTPUT);
11pinMode(12, OUTPUT);
12pinMode(11,
13  OUTPUT);
14Serial.begin(9600);
15 
16}
17 
18void loop() {
19if(Serial.available()){
20
21  t = Serial.read();
22  Serial.println(t);
23}
24 
25if(t == 'F'){            //move
26  forward(all motors rotate in forward direction)
27  digitalWrite(6,HIGH);
28  digitalWrite(4,HIGH);
29}
30
31  
32else if(t == 'B'){      //move reverse (all motors rotate in reverse direction)
33
34  digitalWrite(5,HIGH);
35  digitalWrite(3,HIGH);
36}
37 
38else if(t == 'L'){
39      //turn right (left side motors rotate in forward direction, right side motors
40  doesn't rotate)
41  digitalWrite(4,HIGH);
42}
43 
44else if(t == 'R'){      //turn
45  left (right side motors rotate in forward direction, left side motors doesn't rotate)
46
47  digitalWrite(6,HIGH);
48}
49if(t == 'W'){
50  digitalWrite(13, HIGH);
51}
52
53if(t
54  == 'w'){
55  digitalWrite(13, LOW);
56}
57
58if(t == 'U'){
59  digitalWrite(12,
60  HIGH);
61  digitalWrite(11, HIGH);
62}
63
64if(t == 'u'){
65  digitalWrite(12,
66  LOW);
67  digitalWrite(11, LOW);
68}
69
70delay(100);
71}