Program Sensor Gas MQ-4 Methana for Arduino Project

Program Sensor Gas MQ-4 Methana for Arduino Project

SENSOR GAS MQ-4

Program sensor Gas MQ-4 Methana for Arduino Project - Di postingan kali ini saya akan mengenalkan salah satu Sensor Gas yang bisa di aplikasikan dengan Arduino dan sensor ini bisa jadi bahan penelitian untuk mengukur zat / kadar Gas yang terkandung di dalam suatu ruangan. menggunakan Sensor Gas Methane berserta dengan pemprogramannya .

Sensor Gas MQ-4 adalah komponen elektronika yang dapat mendeteksi kadar gas alam terkompresi / CNG (compressed natural gas) yang utamanya mengandung gas metana (methane, CH4) yang merupakan bentuk zat paling sederhana dari hidrokarbon. Walaupun tidak bersifat racun, gas metana dapat berbahaya karena mudah terbakar (combustive / flammable gas). Gas ini tidak berbau dan tidak berwarna, menjadikannya sulit untuk dideteksi secara langsung oleh manusia.


Berikut Sketch sederhana-nya :

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Int SensorValue;


void setup() {

Serial.begin(9600); //Seting serial port ke 9600

pinMode(A0, INPUT);

}


void loop() {

SensorValue = AnalogRead(A0); //Membaca analog input 0

Serial.println(SensorValue, DEC); // Menampilkan Value dalam DECIMAL

delay(100); // Jeda 100ms

}

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Program Lengkap Sensor Gas MQ-4 Methana Gas Sensor ke dalam satuan PPM
Berikut Sketch Untuk merasi Resistansi R0 :

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/*

 Arduino MQ4 gas sensor - Geekstips.com

 This example is for calculating R0 which is

 the resistance of the sensor at a known concentration 

 without the presence of other gases, or in fresh air

*/

void setup() {

  Serial.begin(9600); //Baud rate

}


void loop() {

  float sensor_volt; //Define variable for sensor voltage

  float RS_air; //Define variable for sensor resistance

  float R0; //Define variable for R0

  float sensorValue; //Define variable for analog readings

  for (int x = 0 ; x < 500 ; x++) //Start for loop

  {

    sensorValue = sensorValue + analogRead(A0); //Add analog values of sensor 500 times

  }

  sensorValue = sensorValue / 500.0; //Take average of readings

  sensor_volt = sensorValue * (5.0 / 1023.0); //Convert average to voltage

  RS_air = ((5.0 * 10.0) / sensor_volt) - 10.0; //Calculate RS in fresh air

  R0 = RS_air / 4.4; //Calculate R0


  Serial.print("R0 = "); //Display "R0"

  Serial.println(R0); //Display value of R0

  delay(1000); //Wait 1 second

}

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Dan berikut ini adalah program untuk mengkalkulasikan / menghitung kadar Gas Methana ke dalam Persentasi (%)  dan kedalam Satuan PPM :

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/*

 Arduino MQ4 gas sensor - Geekstips.com

 This example is to calculate the gas concentration using the R0

 calculated in the example above

 Also a OLED SSD1306 screen is used to display data, if you do not

 have such a display, just delete the code used for displaying

*/


#include <Adafruit_SSD1306.h>

#include <Adafruit_GFX.h>

#include <gfxfont.h>


#include <SPI.h> //Library for SPI interface 

#include <Wire.h> //Library for I2C interface 


#define OLED_RESET 11 //Reset pin 

Adafruit_SSD1306 display(OLED_RESET); //Set Reset pin for OLED display


int led = 10; //LED pin

int buzzer = 9; //Buzzer pin

int gas_sensor = A0; //Sensor pin

float m = -0.318; //Slope

float b = 1.133; //Y-Intercept

float R0 = 11.820; //Sensor Resistance in fresh air from previous code


void setup() {

  Serial.begin(9600); //Baud rate

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); //Initialize screen

  display.setTextColor(WHITE); //Set text color

  display.setTextSize(3); //Set text size

  pinMode(led, OUTPUT); //Set LED as output

  digitalWrite(led, LOW); //Turn LED off

  pinMode(buzzer, OUTPUT); //Set buzzer as output

  digitalWrite(buzzer, LOW); // Turn buzzer off

  pinMode(gas_sensor, INPUT); //Set gas sensor as input

}


void loop() {

  display.clearDisplay(); //Clear display

  display.setCursor(0, 5); //Place cursor in (x,y) location

  float sensor_volt; //Define variable for sensor voltage

  float RS_gas; //Define variable for sensor resistance

  float ratio; //Define variable for ratio

  float sensorValue = analogRead(gas_sensor); //Read analog values of sensor

  sensor_volt = sensorValue * (5.0 / 1023.0); //Convert analog values to voltage

  RS_gas = ((5.0 * 10.0) / sensor_volt) - 10.0; //Get value of RS in a gas

  ratio = RS_gas / R0;   // Get ratio RS_gas/RS_air


  double ppm_log = (log10(ratio) - b) / m; //Get ppm value in linear scale according to the the ratio value

  double ppm = pow(10, ppm_log); //Convert ppm value to log scale

  double percentage = ppm / 10000; //Convert to percentage

  display.print(percentage); //Load screen buffer with percentage value

  display.print("%"); //Load screen buffer with "%"

  display.display(); //Flush characters to screen


  if (ppm > 2000) {

    //Check if ppm value is greater than 2000

    digitalWrite(led, HIGH); //Turn LED on

    digitalWrite(buzzer, HIGH); //Turn buzzer on

  } else {

    //Case ppm is not greater than 2000

    digitalWrite(led, LOW);

    //Turn LED off

    digitalWrite(buzzer, LOW);

    //Turn buzzer off

  }


}

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