Alarm and LED system control

Prototype of application for house alarm system, contained by Gas and Ultrasonic sensor, and LED lights control

Dec 11, 2021

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alarm system

arduino uno

Components and supplies

Resistor 220 ohm

Buzzer

Arduino UNO

Breadboard (generic)

LED (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

Grove - Gas Sensor(MQ2)

Apps and platforms

Arduino IDE

Visual Studio 2017

Project description

Code

Arduino Code

arduino

1#define echoPin 2 // pin D2 echo pin senzora udaljenosti 
2#define trigPin  3 // pin D3 trig pin senzora udaljenosti 
3
4int gas;
5
6long duration;  // varijabla za trajanje zvučnog signala
7int distance; // varijabla za mjerenje  udaljenosti
8bool alarm = false;
9
10
11
12const int buzzer = 9; //buzzer  spojen na arduino pin 9
13
14bool osoba= false;
15bool dim=false;
16
17bool  gasSystem=false;
18
19const int gasPin = A0; //GAS sensor output pin to Arduino  analog A0 pin
20
21void setup()    
22{    
23      
24  Serial.begin(9600);    
25  pinMode(13, OUTPUT);    // izlazni pin spojenih ledica
26
27  pinMode(trigPin,  OUTPUT); //izlazni pin senzora udaljenosti
28  pinMode(echoPin, INPUT);  //ulazni  pin senzora udaljenosti
29
30  pinMode(buzzer, OUTPUT); // buzzer pin 9 je output
31
32}    
33    
34void loop()    
35{   
36  
37  Provjera_Komunikacije();
38  Provjera_Alarma();
39  Provjera_Alarma2();
40}  
41
42void Provjera_Alarma()  {
43  
44 if (alarm == true)
45 { 
46  digitalWrite(trigPin, LOW);
47  delayMicroseconds(2);
48  digitalWrite(trigPin, HIGH);
49  delayMicroseconds(10);
50  digitalWrite(trigPin,  LOW);
51  duration = pulseIn(echoPin, HIGH);
52  distance = duration * 0.034 /  2; // Speed of sound wave divided by 2 (go and back)
53  
54  
55Provjera_Komunikacije();
56
57  if(distance < 20){
58   
59    osoba=true;
60    }
61    if(osoba == true){
62
63        Serial.write("1");
64        tone(buzzer,500);
65        delay(800);
66        
67         
68      
69         noTone(buzzer);
70      }
71    }
72  }
73      
74void Provjera_Komunikacije(){
75  
76  if(Serial.available())
77    
78  {    
79  char  data1=Serial.read();    
80    
81  if (data1 == 'G')
82
83  {
84    alarm = true;
85  }
86
87   else if (data1 == 'H')
88  {
89    alarm  = false;
90    osoba=false;
91   }       
92      
93    
94  switch(data1)    
95  {    
96    case 'O':digitalWrite(13, HIGH);    
97    break;    
98    case 'F':digitalWrite(13, LOW);    
99    break;  
100  }
101
102 if (data1  == 'I')
103  {
104    gasSystem = true;
105    }
106
107   else if (data1 == 'J')
108  {
109     gasSystem = false;
110     dim=false;
111    }      
112  } 
113  }
114
115void  Provjera_Alarma2(){
116  if (gasSystem==true){
117    gas=analogRead(gasPin);
118
119    Provjera_Komunikacije();
120
121   if(gas > 400){
122
123    dim=true;
124}
125
126if  (dim== true){
127  Serial.print('2');
128  tone(buzzer,1500);
129  delay(400);
130  noTone(buzzer);
131  
132              }
133           }
134   }
135

#define echoPin 2 // pin D2 echo pin senzora udaljenosti 
#define trigPin  3 // pin D3 trig pin senzora udaljenosti 

int gas;

long duration;  // varijabla za trajanje zvučnog signala
int distance; // varijabla za mjerenje  udaljenosti
bool alarm = false;



const int buzzer = 9; //buzzer  spojen na arduino pin 9

bool osoba= false;
bool dim=false;

bool  gasSystem=false;

const int gasPin = A0; //GAS sensor output pin to Arduino  analog A0 pin

void setup()    
{    
      
  Serial.begin(9600);    
  pinMode(13, OUTPUT);    // izlazni pin spojenih ledica

  pinMode(trigPin,  OUTPUT); //izlazni pin senzora udaljenosti
  pinMode(echoPin, INPUT);  //ulazni  pin senzora udaljenosti

  pinMode(buzzer, OUTPUT); // buzzer pin 9 je output

}    
    
void loop()    
{   
  
  Provjera_Komunikacije();
  Provjera_Alarma();
  Provjera_Alarma2();
}  

void Provjera_Alarma()  {
  
 if (alarm == true)
 { 
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,  LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 /  2; // Speed of sound wave divided by 2 (go and back)
  
  
Provjera_Komunikacije();

  if(distance < 20){
   
    osoba=true;
    }
    if(osoba == true){

        Serial.write("1");
        tone(buzzer,500);
        delay(800);
        
         
      
         noTone(buzzer);
      }
    }
  }
      
void Provjera_Komunikacije(){
  
  if(Serial.available())
    
  {    
  char  data1=Serial.read();    
    
  if (data1 == 'G')

  {
    alarm = true;
  }

   else if (data1 == 'H')
  {
    alarm  = false;
    osoba=false;
   }       
      
    
  switch(data1)    
  {    
    case 'O':digitalWrite(13, HIGH);    
    break;    
    case 'F':digitalWrite(13, LOW);    
    break;  
  }

 if (data1  == 'I')
  {
    gasSystem = true;
    }

   else if (data1 == 'J')
  {
     gasSystem = false;
     dim=false;
    }      
  } 
  }

void  Provjera_Alarma2(){
  if (gasSystem==true){
    gas=analogRead(gasPin);

    Provjera_Komunikacije();

   if(gas > 400){

    dim=true;
}

if  (dim== true){
  Serial.print('2');
  tone(buzzer,1500);
  delay(400);
  noTone(buzzer);
  
              }
           }
   }

C# code

csharp

In the C # application, which is available to the client, by pressing the ON button under the heading ALARM SYSTEM, the client turns on the alarm system and the ultrasonic sensor constantly measures the distance and sends it to the Arduino. If it has measured a certain distance at which we know someone is in the room, the Arduino sends the information to the buzzer and it advertises. On the OFF button, the client has the option to turn off the alarm system or buzzer. The smoke detection system works in the same way. By pressing the ON button below the GAS SYSTEM heading, the smoke sensor measures air quality and sends it to the Arduino. If the air quality is out of range, an alarm or buzzer is activated. On the OFF button, turn off both the system and the buzzer if it is activated. The LED system works by pressing the ON button below the LED SYSTEM header to turn on the LEDs and they are on until you press the OFF button.

1using System;
2using System.Collections.Generic;
3using System.ComponentModel;
4using  System.Data;
5using System.Drawing;
6using System.Linq;
7using System.Text;
8using  System.Threading.Tasks;
9using System.Windows.Forms;
10using System.IO.Ports;
11
12namespace  Project_RS
13
14{
15    public partial class Form1 : Form
16    {
17        public  SerialPort myport;
18        
19
20        public Form1()
21        {
22            InitializeComponent();
23            
24            
25            
26        }
27
28        
29
30        private void button1_Click(object sender, EventArgs e)
31        {
32            button1.BackColor = Color.Green;
33            button2.BackColor =  Color.White;
34            myport = new SerialPort();
35            myport.BaudRate  = 9600;
36            myport.PortName = "COM7";
37            myport.Open();
38            myport.WriteLine("O");
39            myport.Close();
40        }
41
42        private void button2_Click(object sender, EventArgs e)
43        {
44            button1.BackColor = Color.White;
45            button2.BackColor =  Color.Red;
46            myport = new SerialPort();
47            myport.BaudRate  = 9600;
48            myport.PortName = "COM7";
49            myport.Open();
50            myport.WriteLine("F");
51            myport.Close();
52        }
53
54        private void button3_Click(object sender, EventArgs e)
55        {
56
57            button3.BackColor = Color.Green;
58            button4.BackColor =  Color.White;
59
60            myport = new SerialPort("COM7",9600,Parity.None,8,StopBits.One);
61            myport.BaudRate = 9600;
62            myport.PortName = "COM7";
63            myport.Open();
64            myport.WriteLine("G");
65            myport.Close();
66
67
68
69
70
71            
72           
73        }
74
75        private void button4_Click(object  sender, EventArgs e)
76        {
77
78            button3.BackColor = Color.White;
79            button4.BackColor = Color.Red;
80            myport = new SerialPort();
81            myport.BaudRate = 9600;
82            myport.PortName = "COM7";
83            myport.Open();
84            myport.WriteLine("H");
85            myport.Close();
86        }
87
88        private void label1_Click(object sender, EventArgs e)
89        {
90
91        }
92
93        
94
95        private void button5_Click(object  sender, EventArgs e)
96        {
97            button5.BackColor = Color.Green;
98            button6.BackColor = Color.White;
99            myport = new SerialPort();
100            myport.BaudRate = 9600;
101            myport.PortName = "COM7";
102            myport.Open();
103            myport.WriteLine("I");
104            myport.Close();
105        }
106
107        private void button6_Click(object sender, EventArgs e)
108        {
109            button6.BackColor = Color.Red;
110            button5.BackColor  = Color.White;
111            myport = new SerialPort();
112            myport.BaudRate  = 9600;
113            myport.PortName = "COM7";
114            myport.Open();
115            myport.WriteLine("J");
116            myport.Close();
117        }
118
119        public void button7_Click(object sender, EventArgs e)
120        {
121            
122        }
123
124       public void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs  e)
125        {
126            serialPort1.Open();
127
128            MessageBox.Show(serialPort1.ReadLine());
129        }
130
131        private void button7_Click_1(object sender, EventArgs e)
132        {
133
134        }
135    }
136}
137

using System;
using System.Collections.Generic;
using System.ComponentModel;
using  System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using  System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;

namespace  Project_RS

{
    public partial class Form1 : Form
    {
        public  SerialPort myport;
        

        public Form1()
        {
            InitializeComponent();
            
            
            
        }

        

        private void button1_Click(object sender, EventArgs e)
        {
            button1.BackColor = Color.Green;
            button2.BackColor =  Color.White;
            myport = new SerialPort();
            myport.BaudRate  = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("O");
            myport.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            button1.BackColor = Color.White;
            button2.BackColor =  Color.Red;
            myport = new SerialPort();
            myport.BaudRate  = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("F");
            myport.Close();
        }

        private void button3_Click(object sender, EventArgs e)
        {

            button3.BackColor = Color.Green;
            button4.BackColor =  Color.White;

            myport = new SerialPort("COM7",9600,Parity.None,8,StopBits.One);
            myport.BaudRate = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("G");
            myport.Close();





            
           
        }

        private void button4_Click(object  sender, EventArgs e)
        {

            button3.BackColor = Color.White;
            button4.BackColor = Color.Red;
            myport = new SerialPort();
            myport.BaudRate = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("H");
            myport.Close();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        

        private void button5_Click(object  sender, EventArgs e)
        {
            button5.BackColor = Color.Green;
            button6.BackColor = Color.White;
            myport = new SerialPort();
            myport.BaudRate = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("I");
            myport.Close();
        }

        private void button6_Click(object sender, EventArgs e)
        {
            button6.BackColor = Color.Red;
            button5.BackColor  = Color.White;
            myport = new SerialPort();
            myport.BaudRate  = 9600;
            myport.PortName = "COM7";
            myport.Open();
            myport.WriteLine("J");
            myport.Close();
        }

        public void button7_Click(object sender, EventArgs e)
        {
            
        }

       public void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs  e)
        {
            serialPort1.Open();

            MessageBox.Show(serialPort1.ReadLine());
        }

        private void button7_Click_1(object sender, EventArgs e)
        {

        }
    }
}

Arduino Code

arduino

1#define echoPin 2 // pin D2 echo pin senzora udaljenosti 
2#define trigPin
3  3 // pin D3 trig pin senzora udaljenosti 
4
5int gas;
6
7long duration;
8  // varijabla za trajanje zvučnog signala
9int distance; // varijabla za mjerenje
10  udaljenosti
11bool alarm = false;
12
13
14
15const int buzzer = 9; //buzzer
16  spojen na arduino pin 9
17
18bool osoba= false;
19bool dim=false;
20
21bool
22  gasSystem=false;
23
24const int gasPin = A0; //GAS sensor output pin to Arduino
25  analog A0 pin
26
27void setup()    
28{    
29      
30  Serial.begin(9600);
31    
32  pinMode(13, OUTPUT);    // izlazni pin spojenih ledica
33
34  pinMode(trigPin,
35  OUTPUT); //izlazni pin senzora udaljenosti
36  pinMode(echoPin, INPUT);  //ulazni
37  pin senzora udaljenosti
38
39  pinMode(buzzer, OUTPUT); // buzzer pin 9 je output
40
41}
42    
43    
44void loop()    
45{   
46  
47  Provjera_Komunikacije();
48
49  Provjera_Alarma();
50  Provjera_Alarma2();
51}  
52
53void Provjera_Alarma()
54  {
55  
56 if (alarm == true)
57 { 
58  digitalWrite(trigPin, LOW);
59  delayMicroseconds(2);
60
61  digitalWrite(trigPin, HIGH);
62  delayMicroseconds(10);
63  digitalWrite(trigPin,
64  LOW);
65  duration = pulseIn(echoPin, HIGH);
66  distance = duration * 0.034 /
67  2; // Speed of sound wave divided by 2 (go and back)
68  
69  
70Provjera_Komunikacije();
71
72
73  if(distance < 20){
74   
75    osoba=true;
76    }
77    if(osoba == true){
78
79
80        Serial.write("1");
81        tone(buzzer,500);
82        delay(800);
83
84        
85         
86      
87         noTone(buzzer);
88      }
89    }
90
91  }
92      
93void Provjera_Komunikacije(){
94  
95  if(Serial.available())
96
97    
98  {    
99  char  data1=Serial.read();    
100    
101  if (data1 == 'G')
102
103
104  {
105    alarm = true;
106  }
107
108   else if (data1 == 'H')
109  {
110    alarm
111  = false;
112    osoba=false;
113   }       
114      
115    
116  switch(data1)
117    
118  {    
119    case 'O':digitalWrite(13, HIGH);    
120    break;    
121
122    case 'F':digitalWrite(13, LOW);    
123    break;  
124  }
125
126 if (data1
127  == 'I')
128  {
129    gasSystem = true;
130    }
131
132   else if (data1 == 'J')
133
134  {
135     gasSystem = false;
136     dim=false;
137    }      
138  } 
139  }
140
141void
142  Provjera_Alarma2(){
143  if (gasSystem==true){
144    gas=analogRead(gasPin);
145
146
147    Provjera_Komunikacije();
148
149   if(gas > 400){
150
151    dim=true;
152}
153
154if
155  (dim== true){
156  Serial.print('2');
157  tone(buzzer,1500);
158  delay(400);
159
160  noTone(buzzer);
161  
162              }
163           }
164   }
165

#define echoPin 2 // pin D2 echo pin senzora udaljenosti 
#define trigPin
  3 // pin D3 trig pin senzora udaljenosti 

int gas;

long duration;
  // varijabla za trajanje zvučnog signala
int distance; // varijabla za mjerenje
  udaljenosti
bool alarm = false;



const int buzzer = 9; //buzzer
  spojen na arduino pin 9

bool osoba= false;
bool dim=false;

bool
  gasSystem=false;

const int gasPin = A0; //GAS sensor output pin to Arduino
  analog A0 pin

void setup()    
{    
      
  Serial.begin(9600);
    
  pinMode(13, OUTPUT);    // izlazni pin spojenih ledica

  pinMode(trigPin,
  OUTPUT); //izlazni pin senzora udaljenosti
  pinMode(echoPin, INPUT);  //ulazni
  pin senzora udaljenosti

  pinMode(buzzer, OUTPUT); // buzzer pin 9 je output

}
    
    
void loop()    
{   
  
  Provjera_Komunikacije();

  Provjera_Alarma();
  Provjera_Alarma2();
}  

void Provjera_Alarma()
  {
  
 if (alarm == true)
 { 
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,
  LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 /
  2; // Speed of sound wave divided by 2 (go and back)
  
  
Provjera_Komunikacije();


  if(distance < 20){
   
    osoba=true;
    }
    if(osoba == true){


        Serial.write("1");
        tone(buzzer,500);
        delay(800);

        
         
      
         noTone(buzzer);
      }
    }

  }
      
void Provjera_Komunikacije(){
  
  if(Serial.available())

    
  {    
  char  data1=Serial.read();    
    
  if (data1 == 'G')


  {
    alarm = true;
  }

   else if (data1 == 'H')
  {
    alarm
  = false;
    osoba=false;
   }       
      
    
  switch(data1)
    
  {    
    case 'O':digitalWrite(13, HIGH);    
    break;    

    case 'F':digitalWrite(13, LOW);    
    break;  
  }

 if (data1
  == 'I')
  {
    gasSystem = true;
    }

   else if (data1 == 'J')

  {
     gasSystem = false;
     dim=false;
    }      
  } 
  }

void
  Provjera_Alarma2(){
  if (gasSystem==true){
    gas=analogRead(gasPin);


    Provjera_Komunikacije();

   if(gas > 400){

    dim=true;
}

if
  (dim== true){
  Serial.print('2');
  tone(buzzer,1500);
  delay(400);

  noTone(buzzer);
  
              }
           }
   }

C# code

csharp

1using System;
2using System.Collections.Generic;
3using System.ComponentModel;
4using
5  System.Data;
6using System.Drawing;
7using System.Linq;
8using System.Text;
9using
10  System.Threading.Tasks;
11using System.Windows.Forms;
12using System.IO.Ports;
13
14namespace
15  Project_RS
16
17{
18    public partial class Form1 : Form
19    {
20        public
21  SerialPort myport;
22        
23
24        public Form1()
25        {
26            InitializeComponent();
27
28            
29            
30            
31        }
32
33        
34
35
36        private void button1_Click(object sender, EventArgs e)
37        {
38
39            button1.BackColor = Color.Green;
40            button2.BackColor =
41  Color.White;
42            myport = new SerialPort();
43            myport.BaudRate
44  = 9600;
45            myport.PortName = "COM7";
46            myport.Open();
47
48            myport.WriteLine("O");
49            myport.Close();
50        }
51
52
53        private void button2_Click(object sender, EventArgs e)
54        {
55
56            button1.BackColor = Color.White;
57            button2.BackColor =
58  Color.Red;
59            myport = new SerialPort();
60            myport.BaudRate
61  = 9600;
62            myport.PortName = "COM7";
63            myport.Open();
64
65            myport.WriteLine("F");
66            myport.Close();
67        }
68
69
70        private void button3_Click(object sender, EventArgs e)
71        {
72
73
74            button3.BackColor = Color.Green;
75            button4.BackColor =
76  Color.White;
77
78            myport = new SerialPort("COM7",9600,Parity.None,8,StopBits.One);
79
80            myport.BaudRate = 9600;
81            myport.PortName = "COM7";
82
83            myport.Open();
84            myport.WriteLine("G");
85            myport.Close();
86
87
88
89
90
91
92            
93           
94        }
95
96        private void button4_Click(object
97  sender, EventArgs e)
98        {
99
100            button3.BackColor = Color.White;
101
102            button4.BackColor = Color.Red;
103            myport = new SerialPort();
104
105            myport.BaudRate = 9600;
106            myport.PortName = "COM7";
107
108            myport.Open();
109            myport.WriteLine("H");
110            myport.Close();
111
112        }
113
114        private void label1_Click(object sender, EventArgs e)
115
116        {
117
118        }
119
120        
121
122        private void button5_Click(object
123  sender, EventArgs e)
124        {
125            button5.BackColor = Color.Green;
126
127            button6.BackColor = Color.White;
128            myport = new SerialPort();
129
130            myport.BaudRate = 9600;
131            myport.PortName = "COM7";
132
133            myport.Open();
134            myport.WriteLine("I");
135            myport.Close();
136
137        }
138
139        private void button6_Click(object sender, EventArgs e)
140
141        {
142            button6.BackColor = Color.Red;
143            button5.BackColor
144  = Color.White;
145            myport = new SerialPort();
146            myport.BaudRate
147  = 9600;
148            myport.PortName = "COM7";
149            myport.Open();
150
151            myport.WriteLine("J");
152            myport.Close();
153        }
154
155
156        public void button7_Click(object sender, EventArgs e)
157        {
158            
159
160        }
161
162       public void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs
163  e)
164        {
165            serialPort1.Open();
166
167            MessageBox.Show(serialPort1.ReadLine());
168
169        }
170
171        private void button7_Click_1(object sender, EventArgs e)
172
173        {
174
175        }
176    }
177}
178

using System;
using System.Collections.Generic;
using System.ComponentModel;
using
  System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
  System.Threading.Tasks;
using System.Windows.Forms;
using System.IO.Ports;

namespace
  Project_RS

{
    public partial class Form1 : Form
    {
        public
  SerialPort myport;
        

        public Form1()
        {
            InitializeComponent();

            
            
            
        }

        


        private void button1_Click(object sender, EventArgs e)
        {

            button1.BackColor = Color.Green;
            button2.BackColor =
  Color.White;
            myport = new SerialPort();
            myport.BaudRate
  = 9600;
            myport.PortName = "COM7";
            myport.Open();

            myport.WriteLine("O");
            myport.Close();
        }


        private void button2_Click(object sender, EventArgs e)
        {

            button1.BackColor = Color.White;
            button2.BackColor =
  Color.Red;
            myport = new SerialPort();
            myport.BaudRate
  = 9600;
            myport.PortName = "COM7";
            myport.Open();

            myport.WriteLine("F");
            myport.Close();
        }


        private void button3_Click(object sender, EventArgs e)
        {


            button3.BackColor = Color.Green;
            button4.BackColor =
  Color.White;

            myport = new SerialPort("COM7",9600,Parity.None,8,StopBits.One);

            myport.BaudRate = 9600;
            myport.PortName = "COM7";

            myport.Open();
            myport.WriteLine("G");
            myport.Close();






            
           
        }

        private void button4_Click(object
  sender, EventArgs e)
        {

            button3.BackColor = Color.White;

            button4.BackColor = Color.Red;
            myport = new SerialPort();

            myport.BaudRate = 9600;
            myport.PortName = "COM7";

            myport.Open();
            myport.WriteLine("H");
            myport.Close();

        }

        private void label1_Click(object sender, EventArgs e)

        {

        }

        

        private void button5_Click(object
  sender, EventArgs e)
        {
            button5.BackColor = Color.Green;

            button6.BackColor = Color.White;
            myport = new SerialPort();

            myport.BaudRate = 9600;
            myport.PortName = "COM7";

            myport.Open();
            myport.WriteLine("I");
            myport.Close();

        }

        private void button6_Click(object sender, EventArgs e)

        {
            button6.BackColor = Color.Red;
            button5.BackColor
  = Color.White;
            myport = new SerialPort();
            myport.BaudRate
  = 9600;
            myport.PortName = "COM7";
            myport.Open();

            myport.WriteLine("J");
            myport.Close();
        }


        public void button7_Click(object sender, EventArgs e)
        {
            

        }

       public void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs
  e)
        {
            serialPort1.Open();

            MessageBox.Show(serialPort1.ReadLine());

        }

        private void button7_Click_1(object sender, EventArgs e)

        {

        }
    }
}

Downloadable files

MQ Gas Sensor and Arduino Uno

They are commonly used to detect toxic or explosive gasses and measure gas concentration. Gas sensors are employed in factories and manufacturing facilities to identify gas leaks, and to detect smoke and carbon monoxide in homes.

MQ Gas Sensor and Arduino Uno

Ultrasonic sensor and Arduino Uno

Ultrasonic sensors are supposed to be in front of the door or windows and if something occurs and ultrasonic sensor measure distance less than reference distance, the buzzer will make a sound.

Ultrasonic sensor and Arduino Uno

MQ Gas Sensor and Arduino Uno

Buzzer wiring

Buzzer will make a sound when ultrasonic or gas sensor measures values that vary from reference values.

Buzzer wiring

LED diode wiring

Buzzer wiring

Buzzer will make a sound when ultrasonic or gas sensor measures values that vary from reference values.

Buzzer wiring

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