Overview
Things
Story

CO Gas Leak Detector with Arduino
Components
Construction
Working
Applications
Advantages

Published January 6, 2024

Gas sensor interfacing with Arduino

In this article we will learn how to make CO Gas Leak detector Using Arduino, Relay and LCD display.

ExpertFull instructions provided3 hours235

Things used in this project

Hardware components

Arduino Nano R3

Adafruit RGB Backlight LCD - 16x2

Seeed Studio Grove - Gas Sensor(MQ2)

Buzzer

TaydaElectronics MINI RELAY SPDT 5 PINS 12VDC 10A 120V CONTACT

1N4007 – High Voltage, High Current Rated Diode

General Purpose Transistor NPN

Resistor 10k ohm

Jumper wires (generic)

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

PCB Holder, Soldering Iron

Wire Stripper & Cutter, 32-20 AWG / 0.05-0.5mm² Solid & Stranded Wires

Story

CO Gas Leak Detector with Arduino

In this article we will learn how to make CO Gas Leak detector Using Arduino, Relay and LCD display. You can visit our website, I hope you appreciate my work, let’s discuss about today’s project.

Components:

1. Arduino nano

2. Gas sensor

3. LCD display

4. Buzzer

5. Relay (12v)

6. Diod (4007)

7. Transistor (BC547)

8. Resistor (10k)

9. Jumper wires

GasDetectorwithArduino:

Gas detection Circuit

Construction…

· Connect OUT pin of Gas sensor with A0 pin of Arduino

· Connect VCC pin of Sensor with +ve

· Connect GND pin of Sensor with GND

· Connect D2 pin of Arduino with pin D7 of LCD display

· Connect D3 pin of Arduino with pin D6 of LCD display

· Connect D4 pin of Arduino with pin D5 of LCD display

· Connect D5 pin of Arduino with pin D4 of LCD display

· Connect D6 pin of Arduino with pin E of LCD display

· Connect D7 pin of Arduino with pin RS of LCD display

· Connect RW, VEE, & VSS pins of LCD display with each other and then connect them with GND

· Connect VDD pin of LCD display with +ve

· Connect D8 pin of Arduino with one side of resistor 10k

· Connect 2ndside of resistor with signal pin of transistor

· Connect ammeter pin of transistor with GND

· Connect Collector pin of Transistor with 1st terminal of Relay through +ve side of Diod

· Connect 2ndterminal of Relay with –ve side of Diod and then connect them with +ve

· Connect 3rdand 5th terminal with each other and then connect 3rdterminal with +ve

· Now connect 5thTerminal with one side of Buzzer

· Connect 2ndside of Buzzer with GND

CircuitConnectionDiagram:

Circuit connection Diagram

Working…

A carbon monoxide (CO) gas leak detector using Arduino, a relay, and an LCD display can help you monitor the presence of this potentially dangerous gas in your surroundings.

Applications…

1. Home Safety

2. Industrial Facilities

3. Commercial Buildings

4. Garages and Workshops

5. Hospitals

Advantages…

1. Cost-Effective Solution

2. Customization

3. Real-Time Monitoring

4. Audible and Visual Alerts

5. Educational Tool

Code

Gas Detector Circuit

#include <LiquidCrystal.h>
// Gas Sensor Pin Configuration
const int MQ7SensorPin = A0;
// Relay Module Pin Configuration
const int RelayPin = 8; // You can use any digital pin
// LCD Configuration
LiquidCrystal lcd(7, 6, 5, 4, 3, 2); // Adjust the pin numbers as needed
void setup() {
pinMode(RelayPin, OUTPUT);
Serial.begin(9600);
lcd.begin(16, 2); // Initialize the LCD with its dimensions
lcd.clear(); // Clear the display
}
void loop() {
int sensorValue = analogRead(MQ7SensorPin);
// Convert the analog value to voltage (0-5V)
float voltage = (sensorValue / 1023.0) * 5.0;
// Define a threshold level for CO gas detection
float threshold = 3.0; // You may need to adjust this value
lcd.setCursor(0, 0);
lcd.print("CO Gas Detector");
if (voltage > threshold) {
lcd.setCursor(0, 1);
lcd.print("Danger:Gas!");
Serial.println("Danger: High CO gas detected!");
digitalWrite(RelayPin,HIGH); // Turn on the relay
} else {
lcd.setCursor(0, 0);
lcd.print("CO levels normal");
Serial.println("CO gas levels normal.");
digitalWrite(RelayPin, LOW); // Turn off the relay
}
delay(500); // Delay between readings (adjust as needed)
}

Credits

JACK

21 projects • 2 followers

Gas sensor interfacing with Arduino