Smoke and Gas Detector

A device which uses the gas sensor to tell if there is a gas leakage in your house or not

Aug 28, 2022

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environmental sensing

Components and supplies

LED (generic)

Gas Detection Sensor, Flammable Gas

Arduino UNO

Buzzer

Alphanumeric LCD, 16 x 2

Apps and platforms

Arduino IDE

Project description

Code

The code

c_cpp

upload on Arduino ide

1#include <LiquidCrystal.h>
2
3//System state
4const char onMessage[]   = "Alarm on";
5const char offMessage[] = "Alarm off";
6const char activeMessage[][16]   = {"Gas Detected", "Please evacuate","Fire Detected"};
7const int OFF=0,   ON=1, ACTIVE=2; 
8int state = OFF;
9
10//Pins
11const int tempSensor = A2;
12const   int gasSensor = A3;
13const int led = 5;
14const int piezo = 3;
15const int power   = 2;
16
17const int rs = 8, en = 9, d4=10, d5=11, d6=12, d7=13;
18LiquidCrystal   lcd(rs, en, d4, d5, d6, d7);
19
20int temperature;
21int gas;
22char degree   = 176; //ASCII value of Degree
23unsigned long time;
24
25void setup()
26 {
27   Serial.begin(9600);               //
28  delay(3000);                      //
29   Serial.println("Start");          //
30  
31  pinMode(led, OUTPUT);
32  pinMode(piezo,   OUTPUT);
33  
34  pinMode(A3,INPUT);                //          
35  pinMode(A2,INPUT);                 //
36  
37  lcd.begin(16, 2);
38  setOff(); 
39 }
40
41void   loop()
42{
43  int on = digitalRead(power);
44  int Gas_state = analogRead(A3);    //
45
46  int tmp = analogRead(A0);//Reading data from the sensor.This voltage   is stored as a 10bit number.
47  float voltage = (tmp * 5.0)/1024;//(5*temp)/1024   is to convert the 10 bit number to a voltage reading.
48  float milliVolt = voltage   * 1000;//This is multiplied by 1000 to convert it to millivolt.
49  float tmpCel   =  (milliVolt-500)/10 ;//For TMP36 sensor. Range(−40°C to +125°C)
50  float tmpFer   = (((tmpCel*9)/5)+32);//used to convert Celsius -> Fahrenheit
51
52  if(on &&   (state == OFF)){
53    setOn();
54    Serial.println("Gas Leaked at your premises");
55   }else if(!on && (state != OFF)){
56    setOff();
57  }
58
59if(state == ON)   {
60  readSensors();
61  if(gas > 60) {
62    setActive();
63  }else if(temperature   > 100){
64    setActive1();
65  }
66    
67}else if(state == ACTIVE) {
68  int   ledState = digitalRead(led);
69  digitalWrite(led, !ledState);
70  if(ledState   == HIGH) {
71    delay(50);
72  }else {
73    delay(20);
74  }
75 }
76  
77   time = millis();
78  Serial.print("Time: ");
79  Serial.println(time);
80   
81  /*Serial.print("10bit number(0-1023):  ");
82  Serial.println(tmp);
83   
84  Serial.print("voltage: ");
85  Serial.print(voltage);
86  Serial.println("V");
87   
88  Serial.print("millivolt: ");
89  Serial.print(milliVolt);
90  Serial.println("mV");*/
91   
92  Serial.print("Celsius: ");
93  Serial.print(tmpCel);
94  Serial.println(degree);
95   
96  Serial.print("Fahrenheit: ");
97  Serial.println(tmpFer);
98  Serial.println("");
99   
100  delay(1000);
101}
102 
103void setOff() {
104 state = OFF;
105 digitalWrite(led,   LOW);
106 noTone(piezo);
107 lcd.clear();
108 lcd.setCursor(4, 0);
109 lcd.print(offMessage);   
110}
111
112void setOn() {
113 state = ON;
114 digitalWrite(led, HIGH);
115 lcd.clear();
116   lcd.setCursor(4, 0);
117 lcd.print(onMessage);  
118}
119
120void setActive(){
121   state = ACTIVE;
122 tone(piezo, 750);
123 lcd.clear();
124 lcd.print(activeMessage[0]);
125   lcd.setCursor(0, 1);
126 lcd.print(activeMessage[1]);
127}
128
129void setActive1(){
130   state = ACTIVE;
131 tone(piezo, 750);
132 lcd.clear();
133 lcd.print(activeMessage[2]);
134   lcd.setCursor(0, 1);
135 lcd.print(activeMessage[1]);
136}
137
138void readSensors(){
139   int t = analogRead(tempSensor); 
140  temperature = map(t, 20, 358, -40, 125);
141   int q = analogRead(gasSensor);
142  gas = map(q, 157, 600, 0, 100);
143 }

#include <LiquidCrystal.h>

//System state
const char onMessage[]   = "Alarm on";
const char offMessage[] = "Alarm off";
const char activeMessage[][16]   = {"Gas Detected", "Please evacuate","Fire Detected"};
const int OFF=0,   ON=1, ACTIVE=2; 
int state = OFF;

//Pins
const int tempSensor = A2;
const   int gasSensor = A3;
const int led = 5;
const int piezo = 3;
const int power   = 2;

const int rs = 8, en = 9, d4=10, d5=11, d6=12, d7=13;
LiquidCrystal   lcd(rs, en, d4, d5, d6, d7);

int temperature;
int gas;
char degree   = 176; //ASCII value of Degree
unsigned long time;

void setup()
 {
   Serial.begin(9600);               //
  delay(3000);                      //
   Serial.println("Start");          //
  
  pinMode(led, OUTPUT);
  pinMode(piezo,   OUTPUT);
  
  pinMode(A3,INPUT);                //          
  pinMode(A2,INPUT);                 //
  
  lcd.begin(16, 2);
  setOff(); 
 }

void   loop()
{
  int on = digitalRead(power);
  int Gas_state = analogRead(A3);    //

  int tmp = analogRead(A0);//Reading data from the sensor.This voltage   is stored as a 10bit number.
  float voltage = (tmp * 5.0)/1024;//(5*temp)/1024   is to convert the 10 bit number to a voltage reading.
  float milliVolt = voltage   * 1000;//This is multiplied by 1000 to convert it to millivolt.
  float tmpCel   =  (milliVolt-500)/10 ;//For TMP36 sensor. Range(−40°C to +125°C)
  float tmpFer   = (((tmpCel*9)/5)+32);//used to convert Celsius -> Fahrenheit

  if(on &&   (state == OFF)){
    setOn();
    Serial.println("Gas Leaked at your premises");
   }else if(!on && (state != OFF)){
    setOff();
  }

if(state == ON)   {
  readSensors();
  if(gas > 60) {
    setActive();
  }else if(temperature   > 100){
    setActive1();
  }
    
}else if(state == ACTIVE) {
  int   ledState = digitalRead(led);
  digitalWrite(led, !ledState);
  if(ledState   == HIGH) {
    delay(50);
  }else {
    delay(20);
  }
 }
  
   time = millis();
  Serial.print("Time: ");
  Serial.println(time);
   
  /*Serial.print("10bit number(0-1023):  ");
  Serial.println(tmp);
   
  Serial.print("voltage: ");
  Serial.print(voltage);
  Serial.println("V");
   
  Serial.print("millivolt: ");
  Serial.print(milliVolt);
  Serial.println("mV");*/
   
  Serial.print("Celsius: ");
  Serial.print(tmpCel);
  Serial.println(degree);
   
  Serial.print("Fahrenheit: ");
  Serial.println(tmpFer);
  Serial.println("");
   
  delay(1000);
}
 
void setOff() {
 state = OFF;
 digitalWrite(led,   LOW);
 noTone(piezo);
 lcd.clear();
 lcd.setCursor(4, 0);
 lcd.print(offMessage);   
}

void setOn() {
 state = ON;
 digitalWrite(led, HIGH);
 lcd.clear();
   lcd.setCursor(4, 0);
 lcd.print(onMessage);  
}

void setActive(){
   state = ACTIVE;
 tone(piezo, 750);
 lcd.clear();
 lcd.print(activeMessage[0]);
   lcd.setCursor(0, 1);
 lcd.print(activeMessage[1]);
}

void setActive1(){
   state = ACTIVE;
 tone(piezo, 750);
 lcd.clear();
 lcd.print(activeMessage[2]);
   lcd.setCursor(0, 1);
 lcd.print(activeMessage[1]);
}

void readSensors(){
   int t = analogRead(tempSensor); 
  temperature = map(t, 20, 358, -40, 125);
   int q = analogRead(gasSensor);
  gas = map(q, 157, 600, 0, 100);
 }

The code

c_cpp

upload on Arduino ide

1#include <LiquidCrystal.h>
2
3//System state
4const char onMessage[]  = "Alarm on";
5const char offMessage[] = "Alarm off";
6const char activeMessage[][16]  = {"Gas Detected", "Please evacuate","Fire Detected"};
7const int OFF=0,  ON=1, ACTIVE=2; 
8int state = OFF;
9
10//Pins
11const int tempSensor = A2;
12const  int gasSensor = A3;
13const int led = 5;
14const int piezo = 3;
15const int power  = 2;
16
17const int rs = 8, en = 9, d4=10, d5=11, d6=12, d7=13;
18LiquidCrystal  lcd(rs, en, d4, d5, d6, d7);
19
20int temperature;
21int gas;
22char degree  = 176; //ASCII value of Degree
23unsigned long time;
24
25void setup()
26 {
27  Serial.begin(9600);               //
28  delay(3000);                      //
29  Serial.println("Start");          //
30  
31  pinMode(led, OUTPUT);
32  pinMode(piezo,  OUTPUT);
33  
34  pinMode(A3,INPUT);                //          
35  pinMode(A2,INPUT);                //
36  
37  lcd.begin(16, 2);
38  setOff(); 
39 }
40
41void  loop()
42{
43  int on = digitalRead(power);
44  int Gas_state = analogRead(A3);   //
45
46  int tmp = analogRead(A0);//Reading data from the sensor.This voltage  is stored as a 10bit number.
47  float voltage = (tmp * 5.0)/1024;//(5*temp)/1024  is to convert the 10 bit number to a voltage reading.
48  float milliVolt = voltage  * 1000;//This is multiplied by 1000 to convert it to millivolt.
49  float tmpCel  =  (milliVolt-500)/10 ;//For TMP36 sensor. Range(−40°C to +125°C)
50  float tmpFer  = (((tmpCel*9)/5)+32);//used to convert Celsius -> Fahrenheit
51
52  if(on &&  (state == OFF)){
53    setOn();
54    Serial.println("Gas Leaked at your premises");
55  }else if(!on && (state != OFF)){
56    setOff();
57  }
58
59if(state == ON)  {
60  readSensors();
61  if(gas > 60) {
62    setActive();
63  }else if(temperature  > 100){
64    setActive1();
65  }
66    
67}else if(state == ACTIVE) {
68  int  ledState = digitalRead(led);
69  digitalWrite(led, !ledState);
70  if(ledState  == HIGH) {
71    delay(50);
72  }else {
73    delay(20);
74  }
75 }
76  
77  time = millis();
78  Serial.print("Time: ");
79  Serial.println(time);
80  
81  /*Serial.print("10bit number(0-1023):  ");
82  Serial.println(tmp);
83  
84  Serial.print("voltage: ");
85  Serial.print(voltage);
86  Serial.println("V");
87  
88  Serial.print("millivolt: ");
89  Serial.print(milliVolt);
90  Serial.println("mV");*/
91  
92  Serial.print("Celsius: ");
93  Serial.print(tmpCel);
94  Serial.println(degree);
95  
96  Serial.print("Fahrenheit: ");
97  Serial.println(tmpFer);
98  Serial.println("");
99  
100  delay(1000);
101}
102 
103void setOff() {
104 state = OFF;
105 digitalWrite(led,  LOW);
106 noTone(piezo);
107 lcd.clear();
108 lcd.setCursor(4, 0);
109 lcd.print(offMessage);  
110}
111
112void setOn() {
113 state = ON;
114 digitalWrite(led, HIGH);
115 lcd.clear();
116  lcd.setCursor(4, 0);
117 lcd.print(onMessage);  
118}
119
120void setActive(){
121  state = ACTIVE;
122 tone(piezo, 750);
123 lcd.clear();
124 lcd.print(activeMessage[0]);
125  lcd.setCursor(0, 1);
126 lcd.print(activeMessage[1]);
127}
128
129void setActive1(){
130  state = ACTIVE;
131 tone(piezo, 750);
132 lcd.clear();
133 lcd.print(activeMessage[2]);
134  lcd.setCursor(0, 1);
135 lcd.print(activeMessage[1]);
136}
137
138void readSensors(){
139  int t = analogRead(tempSensor); 
140  temperature = map(t, 20, 358, -40, 125);
141  int q = analogRead(gasSensor);
142  gas = map(q, 157, 600, 0, 100);
143 }

#include <LiquidCrystal.h>

//System state
const char onMessage[]  = "Alarm on";
const char offMessage[] = "Alarm off";
const char activeMessage[][16]  = {"Gas Detected", "Please evacuate","Fire Detected"};
const int OFF=0,  ON=1, ACTIVE=2; 
int state = OFF;

//Pins
const int tempSensor = A2;
const  int gasSensor = A3;
const int led = 5;
const int piezo = 3;
const int power  = 2;

const int rs = 8, en = 9, d4=10, d5=11, d6=12, d7=13;
LiquidCrystal  lcd(rs, en, d4, d5, d6, d7);

int temperature;
int gas;
char degree  = 176; //ASCII value of Degree
unsigned long time;

void setup()
 {
  Serial.begin(9600);               //
  delay(3000);                      //
  Serial.println("Start");          //
  
  pinMode(led, OUTPUT);
  pinMode(piezo,  OUTPUT);
  
  pinMode(A3,INPUT);                //          
  pinMode(A2,INPUT);                //
  
  lcd.begin(16, 2);
  setOff(); 
 }

void  loop()
{
  int on = digitalRead(power);
  int Gas_state = analogRead(A3);   //

  int tmp = analogRead(A0);//Reading data from the sensor.This voltage  is stored as a 10bit number.
  float voltage = (tmp * 5.0)/1024;//(5*temp)/1024  is to convert the 10 bit number to a voltage reading.
  float milliVolt = voltage  * 1000;//This is multiplied by 1000 to convert it to millivolt.
  float tmpCel  =  (milliVolt-500)/10 ;//For TMP36 sensor. Range(−40°C to +125°C)
  float tmpFer  = (((tmpCel*9)/5)+32);//used to convert Celsius -> Fahrenheit

  if(on &&  (state == OFF)){
    setOn();
    Serial.println("Gas Leaked at your premises");
  }else if(!on && (state != OFF)){
    setOff();
  }

if(state == ON)  {
  readSensors();
  if(gas > 60) {
    setActive();
  }else if(temperature  > 100){
    setActive1();
  }
    
}else if(state == ACTIVE) {
  int  ledState = digitalRead(led);
  digitalWrite(led, !ledState);
  if(ledState  == HIGH) {
    delay(50);
  }else {
    delay(20);
  }
 }
  
  time = millis();
  Serial.print("Time: ");
  Serial.println(time);
  
  /*Serial.print("10bit number(0-1023):  ");
  Serial.println(tmp);
  
  Serial.print("voltage: ");
  Serial.print(voltage);
  Serial.println("V");
  
  Serial.print("millivolt: ");
  Serial.print(milliVolt);
  Serial.println("mV");*/
  
  Serial.print("Celsius: ");
  Serial.print(tmpCel);
  Serial.println(degree);
  
  Serial.print("Fahrenheit: ");
  Serial.println(tmpFer);
  Serial.println("");
  
  delay(1000);
}
 
void setOff() {
 state = OFF;
 digitalWrite(led,  LOW);
 noTone(piezo);
 lcd.clear();
 lcd.setCursor(4, 0);
 lcd.print(offMessage);  
}

void setOn() {
 state = ON;
 digitalWrite(led, HIGH);
 lcd.clear();
  lcd.setCursor(4, 0);
 lcd.print(onMessage);  
}

void setActive(){
  state = ACTIVE;
 tone(piezo, 750);
 lcd.clear();
 lcd.print(activeMessage[0]);
  lcd.setCursor(0, 1);
 lcd.print(activeMessage[1]);
}

void setActive1(){
  state = ACTIVE;
 tone(piezo, 750);
 lcd.clear();
 lcd.print(activeMessage[2]);
  lcd.setCursor(0, 1);
 lcd.print(activeMessage[1]);
}

void readSensors(){
  int t = analogRead(tempSensor); 
  temperature = map(t, 20, 358, -40, 125);
  int q = analogRead(gasSensor);
  gas = map(q, 157, 600, 0, 100);
 }

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