How to make gas leak alert security alarm using arduino

In this tutorial I will show you how to make gas leak alert security alarm using arduino nano and mq 5 gas sensor

Sep 1, 2020

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Components and supplies

Gravity: Analog LPG Gas Sensor (MQ5) For Arduino

5V 2.5A Switching Power Supply

LED (generic)

Buzzer

Arduino Nano R3

5 mm LED: Green

Tools and machines

Soldering iron (generic)

PCB, For DMB-4775

Solder Wire, Lead Free

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Apps and platforms

Arduino IDE

Project description

Code

Arduino source code

arduino

1int redLed = 12;
2int greenLed = 11;
3int buzzer = 10;
4int smokeA0  = A5;
5// Your threshold value
6int sensorThres = 120;
7
8void setup() {
9  pinMode(redLed, OUTPUT);
10  pinMode(greenLed, OUTPUT);
11  pinMode(buzzer,  OUTPUT);
12  pinMode(smokeA0, INPUT);
13  Serial.begin(9600);
14}
15
16void  loop() {
17  int analogSensor = analogRead(smokeA0);
18
19  Serial.print("Pin  A0: ");
20  Serial.println(analogSensor);
21  // Checks if it has reached the  threshold value
22  if (analogSensor > sensorThres)
23  {
24    digitalWrite(redLed,  HIGH);
25    digitalWrite(greenLed, LOW);
26    digitalWrite(buzzer, HIGH);
27  }
28  else
29  {
30    digitalWrite(redLed, LOW);
31    digitalWrite(greenLed,  HIGH);
32    digitalWrite(buzzer, LOW);
33  }
34  delay(100);
35}
36

int redLed = 12;
int greenLed = 11;
int buzzer = 10;
int smokeA0  = A5;
// Your threshold value
int sensorThres = 120;

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(buzzer,  OUTPUT);
  pinMode(smokeA0, INPUT);
  Serial.begin(9600);
}

void  loop() {
  int analogSensor = analogRead(smokeA0);

  Serial.print("Pin  A0: ");
  Serial.println(analogSensor);
  // Checks if it has reached the  threshold value
  if (analogSensor > sensorThres)
  {
    digitalWrite(redLed,  HIGH);
    digitalWrite(greenLed, LOW);
    digitalWrite(buzzer, HIGH);
  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed,  HIGH);
    digitalWrite(buzzer, LOW);
  }
  delay(100);
}

Downloadable files

Circuit Diagram

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