Automatic Room Lights Control

1#include <LiquidCrystal.h>
2const int rs = 13, en = 6, d4 = 4, d5 =  10, d6 = 9, d7 = 7; 
3int trigPin1 = 2;
4int echoPin1 = 3;
5int led1 = 8;
6int  trigPin2 = 12;
7int echoPin2 = 11;
8int loop_count = 0;
9int counter1 = 0;
10int  counter2 = 0;
11int people_count = 0;
12int s1 = 0 , s2 = 0;
13int s1_prev =  0 , s2_prev = 0;
14int led2 = 5; 
15
16void setup() {
17  Serial.begin(9600);  
18   pinMode(led1, OUTPUT);
19   pinMode(trigPin1, OUTPUT);
20  pinMode(echoPin1,  INPUT);
21   pinMode(trigPin2, OUTPUT);
22    pinMode(echoPin2, INPUT);
23    pinMode(led2,  OUTPUT);
24   // set up the LCD's number of columns and rows:
25  lcd.begin(16,  2);
26  // Print a message to the LCD.
27  lcd.print("No of People :");
28
29}
30
31void  loop() 
32{
33  long duration1, distance1, distance2, duration2;
34  digitalWrite(trigPin1,HIGH);
35  delayMicroseconds(1000);
36  digitalWrite(trigPin1, LOW);
37  duration1=pulseIn(echoPin1,  HIGH);
38  distance1 =(duration1/2)/29.1;
39  //Serial.print("distance 1: ");
40  //Serial.print(distance1);
41  //Serial.println("CM");
42  delay(10);
43  digitalWrite(trigPin2,HIGH);
44  delayMicroseconds(1000);
45  digitalWrite(trigPin2,  LOW);
46  duration2=pulseIn(echoPin2, HIGH);
47  distance2 =(duration2/2)/29.1;
48  //Serial.print("distance 2: ");
49  //Serial.print(distance2);
50  //Serial.println("CM");
51  delay(10);
52 
53 if(distance1<=50)
54  {
55    digitalWrite(led1, HIGH);
56    s1 = 1;
57  }
58   else if(distance1>50)
59  {
60     digitalWrite(led1,  LOW);
61     s1 = 0;
62   }
63   if (distance2<=50)
64   {
65    digitalWrite(led1,  HIGH);
66    s2 = 1;
67    }
68   else if(distance2>50 )
69   {
70    digitalWrite(led1,  LOW);
71    s2 = 0;
72   }
73   loop_count++;
74   if ((s1_prev ==0) && (s1  == 1))
75     {
76      counter1 = loop_count;
77     }
78   if ((s2_prev ==  0) && (s2 == 1))
79   {
80      counter2 = loop_count;
81    }
82   s1_prev  = s1;
83   s2_prev = s2;
84
85   if ((counter1>0) && (counter2>0))
86      {
87        if (counter1>counter2)
88        {
89          people_count ++;   
90        }
91        else
92        {
93          people_count --;
94        }
95        if (people_count < 0)
96        {
97          people_count = 0;
98        }
99    if (people_count>0)
100    {
101    digitalWrite(led2, HIGH);  
102    }
103     else
104     {
105      digitalWrite(led2, LOW);
106     }
107       
108        Serial.print("Counter  1 :");
109        Serial.println(counter1);
110        Serial.print("Counter 2  :");
111        Serial.println(counter2);
112        Serial.print("Number of people  : ");
113        Serial.println(people_count);
114        counter1 = 0;
115        counter2  = 0;
116      }
117
118  lcd.setCursor(0, 1);
119  // print the number of seconds  since reset:
120  lcd.print(people_count);
121}
122