Node.js web page controlled Robotic Car (Wireless)

1const int en1 = 9;
2const int en2 = 3;
3const int inp1 = 2;
4const  int inp2 = 4;
5const int inp3 = 7;
6const int inp4 = 8;
7char charRead;
8String  inputString = "";
9
10void setup() {
11  Serial.begin(9600);
12  pinMode(en1,  OUTPUT);
13  pinMode(en2, OUTPUT);
14  pinMode(inp1, OUTPUT);
15  pinMode(inp2,  OUTPUT);
16  pinMode(inp3, OUTPUT);
17  pinMode(inp4, OUTPUT);
18}
19
20void  loop() {
21  // put your main code here, to run repeatedly:
22  if (Serial.available())  {
23    charRead = Serial.read();
24    if (charRead != 'T') {
25      inputString  += charRead;
26    } else {
27      if (inputString == "forward") {
28        //  To move Forward
29        digitalWrite(inp1, HIGH);
30        digitalWrite(inp2,  LOW);
31        digitalWrite(inp3, HIGH);
32        digitalWrite(inp4, LOW);
33      } else if (inputString == "backward") {
34        // To move backward
35        digitalWrite(inp1, LOW);
36        digitalWrite(inp2, HIGH);
37        digitalWrite(inp3,  LOW);
38        digitalWrite(inp4, HIGH);
39      } else if (inputString == "fleft")  {
40        // To move left
41        digitalWrite(inp1, HIGH);
42        digitalWrite(inp2,  LOW);
43        digitalWrite(inp3, LOW);
44        digitalWrite(inp4, LOW);
45      } else if (inputString == "fright") {
46        // To move right
47        digitalWrite(inp1,  LOW);
48        digitalWrite(inp2, LOW);
49        digitalWrite(inp3, HIGH);
50        digitalWrite(inp4, LOW);
51      }
52      else if (inputString == "bleft")  {
53        // To move back left
54        digitalWrite(inp1, LOW);
55        digitalWrite(inp2,  LOW);
56        digitalWrite(inp3, LOW);
57        digitalWrite(inp4, HIGH);
58      }
59      else if (inputString == "bright") {
60        // To move back  right
61        digitalWrite(inp1, LOW);
62        digitalWrite(inp2, HIGH);
63        digitalWrite(inp3, LOW);
64        digitalWrite(inp4, LOW);
65      }
66      else if (inputString == "break") {
67        // To Stop
68        analogWrite(en1,  50);
69        analogWrite(en2, 50);
70        delay(550);
71        digitalWrite(inp1,  LOW);
72        digitalWrite(inp2, LOW);
73        digitalWrite(inp3, LOW);
74        digitalWrite(inp4, LOW);
75        analogWrite(en1, 150);
76        analogWrite(en2,  150);
77      }
78      else if (inputString == "maxspeed") {
79        //  Max speed
80        analogWrite(en1, 250);
81        analogWrite(en2, 250);
82      }
83      else if (inputString == "medspeed") {
84        // Medium Speed
85        analogWrite(en1, 180);
86        analogWrite(en2, 180);
87      }
88      else if (inputString == "lowspeed") {
89        // Low speed
90        analogWrite(en1,  90);
91        analogWrite(en2, 90);
92      }
93      else {
94        // Stop
95        digitalWrite(inp1, LOW);
96        digitalWrite(inp2, LOW);
97        digitalWrite(inp3,  LOW);
98        digitalWrite(inp4, LOW);
99      }
100      inputString = "";
101    }
102  }
103}