DIY Bluetooth Controlled RC Car using Arduino, HC-05, L298N & Lithium Battery

1int in1 = 12;
2int in2 = 11;
3int in3 = 10;
4int in4 = 9;
5char command;
6
7void setup()
8{
9  pinMode(in1,OUTPUT);
10  pinMode(in2,OUTPUT);
11  pinMode(in3,OUTPUT);
12  pinMode(in4,OUTPUT);
13}
14void loop()
15{
16  if(Serial.available() > 0)
17  {
18    command = Serial.read();
19
20    if(command =='F')
21    {
22    digitalWrite(in1,HIGH);
23    digitalWrite(in2,LOW);
24    digitalWrite(in3,HIGH);
25    digitalWrite(in4,LOW);
26    }
27    if(command=='B')
28    {
29    digitalWrite(in1,LOW);
30    digitalWrite(in2,HIGH);
31    digitalWrite(in3,LOW);
32    digitalWrite(in4,HIGH);
33    }
34    if(command=='R')
35    {
36    digitalWrite(in1,HIGH);
37    digitalWrite(in2,LOW);
38    digitalWrite(in3,LOW);
39    digitalWrite(in4,LOW);
40    }
41    if(command=='L')
42    {
43    digitalWrite(in1,LOW);
44    digitalWrite(in2,LOW);
45    digitalWrite(in3,HIGH);
46    digitalWrite(in4,LOW);
47    }
48    if(command=='S')
49    {
50    digitalWrite(in1,LOW);
51    digitalWrite(in2,LOW);
52    digitalWrite(in3,LOW);
53    digitalWrite(in4,LOW);
54    }
55    
56  }
57}