Arduino Based Voice Alert System for Blinds

1//Program to
2#include <SoftwareSerial.h> // Software Seral lbrary
3
4SoftwareSerial  BTserial(2, 3); // RX | TX
5
6const int TGpin = 10;// Defnes Trg and Echo pns  of the Ultrasonc Sensor
7
8const int ECOpin = 11;
9
10const int buzzer=7;
11
12long  duration;// Varables for the duraton and the dstance
13
14int distance;
15
16String  Msg1 =String(" Obstacle detected at ");
17
18String Msg2 =String(" CentMeter");
19
20String  Msg5 =String(" No obstacle detected ");
21
22void setup() {
23
24  pinMode(TGpin,  OUTPUT); // Sets the TGpin as an Output
25
26  pinMode(ECOpin, INPUT); // Sets  the ECOpin as an input
27
28  pinMode(buzzer, OUTPUT);// Sets the 7th as an Output
29
30  Serial.begin(9600);
31
32  BTserial.begin(9600);
33
34  Serial.println("Engineers  Garage");//After initialising print data
35
36  delay(1000);
37
38  Serial.print("   UltraSonic   ");delay(1000);  
39
40  Serial.println("     HC-SR04    ");delay(1000);    
41
42  Serial.println("Distance:       "); delay(1000);
43
44  BTserial.println("Arduino  is ready");delay(1000);
45
46  BTserial.println("Designed by Engineers Garage");
47
48  delay(1000);
49
50  BTserial.println("Voice for Blind Persons");
51
52}
53
54
55
56
57
58void  loop(){
59
60Serial.print("Distance:       ");
61
62distance = FindDistance();
63
64Serial.print(distance);
65
66Serial.println("Cm");
67
68//BTserial.println(distance);
69
70if(digitalRead(A0)==LOW){
71
72  while(1){
73
74Serial.print(distance);
75
76Serial.println("Cm");
77
78delay(400);
79
80if(distance==0){
81
82  BTserial.println(Msg5);  
83
84  }
85
86if(digitalRead(A0)==HIGH){
87
88BTserial.println(Msg1+distance+Msg2);
89
90Serial.println(Msg1+distance+Msg2);
91
92delay(2000);
93
94break;
95
96}
97
98  }
99
100} 
101
102
103}
104
105
106// Function for calculating the distance measured  by the Ultrasonic sensor
107
108int FindDistance(){ 
109
110  digitalWrite(TGpin,  LOW); 
111
112  delayMicroseconds(2);
113
114  digitalWrite(TGpin, HIGH); 
115
116  delayMicroseconds(10);
117
118  digitalWrite(TGpin, LOW);
119
120  duration =  pulseIn(ECOpin, HIGH); // Reads the ECOpin, returns the sound wave travel time in  microseconds
121
122  distance = duration * 0.0324/1.8;
123
124  return distance;
125
126}