Connect Gas Sensor With Bluetooth Using Arduino Mega 2560

Introduction

• In this article, I will explain about connecting the Gas Sensor to the Bluetooth.
• When the gas is leaked, it can automatically send the message to the app.
• We can control the gas leakage in the house.

Parts Of Lists

• Arduino Mega 2560
• Bluetooth
• Gas Sensor
• Bread Board
• Hook Up wires

Connection

Step 1

Connection from Arduino Board to the Bluetooth.

Bluetooth	Board
Vcc	5v
Gnd	Gnd
RX	TX
TX	RX

Step 2

Connection from Arduino Board to the Sensor.

Sensor	Board
Vcc	5v
Gnd	Gnd
Vin	A0

Programming

const int AOUTpin = 0; //the AOUT pin of the CO sensor goes into analog pin A0 of the arduino
const int DOUTpin = 8; //the DOUT pin of the CO sensor goes into digital pin D8 of the arduino
const int ledPin = 13; //the anode of the LED connects to digital pin D13 of the arduino
int limit;
int value;
void setup()
{
    Serial.begin(9600);
    //sets the baud rate pinMode(DOUTpin, INPUT);
    //sets the pin as an input to the arduino pinMode(ledPin, OUTPUT);
    //sets the pin as an output of the arduino
}
void loop()
{
    value = analogRead(AOUTpin); //reads the analaog value from the CO sensor's AOUT pin
    limit = digitalRead(DOUTpin); //reads the digital value from the CO sensor's DOUT pin
    Serial.print("CO value: ");
    Serial.println(value); //prints the CO value
    Serial.print("Limit: ");
    Serial.print(limit); //prints the limit reached as either LOW or HIGH (above or underneath)
    delay(100);
    if (limit == HIGH)
    {
        Serial.println("Bad");
    }
    else
    {
        Serial.println("OK");
    }
}

Explanation

• We have to build the App in the App inverter
• They can show the Gas level in the App
• When the gas is leaked, it can be used to control the gas level through the App
• When the gas is leaked, it can be printed in the Serial monitor as Bad.