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Ron Varun Lowe

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Description

Gas leak detector alarm system with arduino nano

In this tutorial we will see how to assemble a gas leak detector alarm system with arduino nano. We will see a list of the electronic components to be used, the assembly of the circuit, the source code, and finally we will test the operation of the system. This project is ideal for use in sources near our home, where there is gas, such as a kitchen, stove or thermotanque

Electronic components

mq2 gas sensor

Pin-Out sensor de gas Mq-2

Datasheet sensor MQ-2

Download–> MQ-2

Gas sensor (MQ2) is useful for gas leak detection (in home and industry). It can detect LPG, i-butane, methane, alcohol, hydrogen, smoke, etc. Based on its fast response time. measures can be taken as soon as possible. In addition, the sensitivity can be adjusted using a potentiometer (digital pin).

TECHNICAL SPECIFICATIONS

Operating Voltage: 5V DC

Fast

response and high sensitivity Detection range: 300 to 10000

ppm

Characteristic gas: 1000ppm, Isobutane Sensing resistance:

1KΩ 50ppm Toluene at 20KΩ in Response Time: ≤ 10s

Recovery time: ≤ 30s

Working temperature: -20°C~+55°C

Humidity: ≤ 95% RH

Ambient oxygen content: 21%

Consumes less than 150mA at 5V.

APPLICATIONS

Gas

Leak Detector Industrial Gas Detector

Arduino nano

The Arduino Nano is a small, complete and compatible board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality as the Arduino Duemilanove, but in a different package. It only lacks a DC power connector and works with a Mini-B USB cable instead of a standard one.

Pin diagram

Six 5 mm LED diodes of different colors

Six resistors of 1 Kohm

A 5-volt buzeer

Female pins (4 pins in total)

Male pins (In total 2)

Socket for the arduino nano

PCB

Circuit

Code

Source Code

Arduino

int sensorMQ2=0;
void setup(){
Serial.begin(9600);//Configuración de la velocidad del puerto serial de arduino a 9600
//Se configuraran los pines 2,3,4,5,6 y 7 como salidas 
//Del pin 2 al 6 van conectados a diodos led con su respectiva resistencia
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(6, OUTPUT);
 //Va conectado al Buzzer
 pinMode(7, OUTPUT);
 sensorMQ2=analogRead(A0);//Se lee el valor de la entrada analógica  A0 donde está conectado el sensor MQ2
while(sensorMQ2>80){
  Serial.print("Esperando a que se estabilice el sensor MQ2 (valor menor a 80): ");//Se imprime su valor por el terminal serial
  sensorMQ2=analogRead(A0);//Se lee el valor de la entrada analógica  A0
  Serial.println(sensorMQ2);//Se imprime su valor por el terminal serial
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  delay(500);
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  delay(500); 
 }
}
void loop(){
sensorMQ2=analogRead(A0);//Se lee el valor de la entrada analógica  A0
Serial.print("Valor del sensor MQ2: ");
Serial.println(sensorMQ2);//Se imprime su valor por el terminal serial
//Se compara el valor de la variable sensorMQ2 si se cumple apagará todos los led
if(sensorMQ2<79){
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  }
//Se compara el valor de la variable sensorMQ2 si se cumple encenderá el led en el pin 2
if(sensorMQ2>80){
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  }
//Se compara el valor de la variable sensorMQ2 si se cumple encenderá el led en el pin 2 y 3
if(sensorMQ2>120){
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  }
//Se compara el valor de la variable sensorMQ2 si se cumple encenderá el led en el pin 2, 3 y 4
if(sensorMQ2>160){
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  }
//Se compara el valor de la variable sensorMQ2 si se cumple encenderá el led en el pin 2, 3, 4, y 5
if(sensorMQ2>200){
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW);

  }
//Se compara el valor de la variable sensorMQ2 si se cumple encenderá el led en el pin 2, 3 ,4 ,5, 6 y el buzzer
if(sensorMQ2>240){
  digitalWrite(2, HIGH);
  digitalWrite(3, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);//Se actica el buzzer

  }         
delay(100);// retardo antes de comenzar de vuelta
}

Download Gerbers

Sep 01,2021

2,427 views

Gas leak detector alarm system with arduino nano

In this tutorial we will see how to assemble a gas leak detector alarm system with arduino nano. We will see a list of the electronic compon

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Published: Sep 01,2021

Download Gerber file 30

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