Published October 20, 2020 © GPL3+

Smoke Detector using Gas Sensor

In this project, we will learn how to create a smoke detector using Arduino. This will help us detect the intensity of gases.

IntermediateFull instructions provided19,289

Things used in this project

Hardware components

Arduino UNO

Breadboard (generic)

Seeed Studio Gas Sensor

Buzzer, Piezo

5 mm LED: Red

5 mm LED: Green

Resistor 220 ohm

Jumper wires (generic)

Software apps and online services

Arduino IDE

Autodesk Tinkercad

This CAD tool helps to create and simulate the requisite circuit

Story

About the Project

In this project, we will create a smoke detector using Arduino. The detector will detect the smoke and will notify the user through the buzzer and red LED if the smoke density is above the safety limit.

Gas Sensor

When we apply bias to the sensor, it takes some time for the sensor to warm, after that the electrochemical sensor detects specific Gas and varies the current flow through the sensor. Hence we get analog output ranges depends on Gas concentration.

It has 6 pins in all.The centre has two pins which are called the H pins (Heater pins).The other pins up and down pairs are known as A and B pins. Both pins are connected with separate sensors.

Both A pins are connected to the +5 DC voltage, both B pins are connected to the Analog Output pins of the Arduino and one H pin to the ground while another H pin to +5 DC voltage. We can vary the sensitivity of the sensor by connecting a resistor between ground and a B pin. So we can control the sensitivity of the detector by changing the resistance

GAS Sensor Pin Layout

Circuit Diagram

CIRCUIT DIAGRAM

Procedure

1.) Arrange the components as per the given circuit diagram

2.) Write the appropriate code for the requisite applications.

3.) Upload your code in the Arduino.

4.) Now simulate your circuit.

Suggestions:-

You may use other types of sensors

You can replace the two LEDs by an RGB LED.

Try to modify your code using functions.

Code

Code for smoke Detector

int red_LED_PIN = 11;
int green_LED_PIN = 9;
int blue_LED_PIN = 10;
int buzzer = 6;
int smoke_detector = A0;
int safety_lim = 60; //Sets smoke density safe limit

void setup() {
  pinMode(red_LED_PIN, OUTPUT);
  pinMode(green_LED_PIN, OUTPUT);
  pinMode(blue_LED_PIN, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smoke_detector, INPUT);
  Serial.begin(9600); //baud rate
}

void loop() {
  int sensor_read = analogRead(smoke_detector); 
  	//reads and stores the reading from the detector in sensor_read

  Serial.print("Smoke Density: ");
  Serial.println(sensor_read);
  
  if (sensor_read > safety_lim)
    // Checks if reading is beyond safety limit
  {
	analogWrite(red_LED_PIN,255);
    analogWrite(green_LED_PIN, 0);
    tone(buzzer,500, 100); //piezo rings 
  }
  else
  {
    analogWrite(green_LED_PIN, 255);
    analogWrite(red_LED_PIN,0);
    noTone(buzzer); //peizo wont ring
  }
  delay(50);
}

Credits

srajandikshit147

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Smoke Detector using Gas Sensor

Things used in this project

Hardware components

Software apps and online services

Story

About the Project

Gas Sensor

Circuit Diagram

Procedure

Suggestions:-

Schematics

Schematic of Smoke Detector

Code

Code for smoke Detector

Credits

srajandikshit147

Comments

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Smoke Detector using Gas Sensor

Smoke Detector using Gas Sensor

Things used in this project

Hardware components

Software apps and online services

Story

About the Project

Gas Sensor

Circuit Diagram

Procedure

Suggestions:-

Schematics

Schematic of Smoke Detector

Code

Code for smoke Detector

Credits

srajandikshit147

Comments

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