Hydrogen Reader Through ESP32 (Mobile App Based)

Project : 41

Introduction:

     The Hydrogen Gas Monitoring System project aims to create a wireless system that can            monitor hydrogen gas levels and upload the data to a Firebase database for remote      and       analysis. The system utilizes an ESP32 development board, a hydrogen gas sensor, and    Firebase's real-time database. The objective is to provide an efficient and reliable solution for    monitoring hydrogen gas levels in an environment.

 

Apparatus Required:

·       ESP32 Development Board: The ESP32 serves as the main controller and provides the           necessary processing power and Wi-Fi connectivity.

·   Hydrogen Gas Sensor: A hydrogen gas sensor is used to measure the concentration of hydrogen gas in the environment.

·      Custom-Designed PCB: A custom-designed PCB is used for circuit connections and mounting the components.

·       Liquid Crystal Display (LCD): An LCD is used to display the hydrogen gas readings.

Pin Configuration:

·   trigPin: Connected to pin 5 of the ESP32 board. It is set as an output pin to send the trigger signal for the ultrasonic sensor.

·   echoPin: Connected to pin 18 of the ESP32 board. It is set as an input pin to receive the echo signal from the ultrasonic sensor.

·   MOTOR1: Connected to pin 27 of the ESP32 board. It is set as an output pin to control the direction of Motor 1.

·     MOTOR2: Connected to pin 26 of the ESP32 board. It is set as an output pin to control the direction of Motor 2.

·   MOTOR3: Connected to pin 25 of the ESP32 board. It is set as an output pin to control the direction of Motor 3.

·    MOTOR4: Connected to pin 33 of the ESP32 board. It is set as an output pin to control the direction of Motor 4.

·     sensor pin: Connected to pin 34 of the ESP32 board. It is set as an input pin to read the analog output from the hydrogen gas sensor.

 

Libraries Used:

·       Arduino.h: The standard Arduino library for general-purpose functions and communication with the ESP32 board.

·       WiFi.h: The library for connecting to a Wi-Fi network and establishing an internet connection

·       FirebaseESP32.h: The Firebase library for interfacing with the Firebase real-time database.

 

Program:

 

//Copy the blynk credential from your acoount device and paset it here

 

#define BLYNK_TEMPLATE_ID "TMPL670BbO1Nl"

#define BLYNK_TEMPLATE_NAME "Data Monitoring"

#define BLYNK_AUTH_TOKEN "4Q5w-qYfY3jO82qXBaL3O0E3irLFfDwb"

 

 

#define BLYNK_PRINT Serial

#include <BlynkSimpleEsp32.h>

#include <Wire.h>

#include <WiFi.h>

#include <LiquidCrystal_I2C.h>

 

 

LiquidCrystal_I2C lcd(0x27, 16, 2);

 

#define Sensor_PIN 34

 

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "nepatronix_2.4";  //Enter your WIFI SSID name

char pass[] = "CLB269DA03";      //Enter your WIFI password

BlynkTimer timer;

 

 

void notify() {

  int value = analogRead(Sensor_PIN);

  value = map(value, 0, 4095, 200, 700);

  Serial.println(value);

  Blynk.virtualWrite(V1, value);

  display(1, 1, String(value));

 

 

 

  //  if (value == 800) { // If 1 receive then turn ON

  //    display(1, 1, "Toxic Air");

  //    Blynk.logEvent("intruder_alert", "Intruder Detected");

  //  } else {// Else turn OFF

  //    display(1, 1, "Noraml air");

  //  }

  delay(100);

}

 

void setup() {

  Serial.begin(9600);

  Wire.begin();

  lcd.begin();

  lcd.clear();

  lcd.backlight();

  lcd.setCursor(1, 0);

  lcd.print("**NEPATRONIX**");

  delay(2000);

  lcd.clear();

  pinMode(Sensor_PIN, INPUT);

  display(1, 0, "Hydrogen: ");

  Blynk.begin(auth, ssid, pass); //Connecting to Blynk Server with ssid and password

  delay(500);

  Serial.println(WiFi.localIP());

 

  timer.setInterval(100L, notify);

 

}

 

void loop() {

  Blynk.run(); //run the blynk function in loop

  timer.run();

}

 

void display(int col, int row, String msg) {

 

  lcd.setCursor(col, row);

  lcd.print(msg);

}

 

Working:

·       Initialization: The ESP32 development board is powered on and the necessary pins are configured. Wi-Fi connectivity is established by connecting to the specified network.

·       Sensor Reading: The hydrogen gas sensor's analog output is read using the ‘analogRead()” function. The raw sensor value is then mapped to a meaningful range of hydrogen gas concentrations.

·       Data Upload: If the specified delay has clapsed, the system uploads the hydrogen gas reading to the Firebase database using the "Firebase.setInt() function.This allows for real-time monitoring and analysis of the hydrogen gas levels.

·       LCD Display: The hydrogen gas reading is displayed on the LCD screen using the “led.print()" function. The LCD backlight is also turned on using the “led.backlight()" function.

·       Delay: The system waits for a specified delay of 500 milliseconds before repeating the process. By continuously reading the hydrogen gas sensor, uploading the data to Firebase, and displaying the reading on the LCD screen, the system provides real-time monitoring of hydrogen gas levels. The Firebase integration allows for remote access and analysis of the data, making it a valuable tool for monitoring and managing hydrogen gas environments.

·       Initialization: The ESP32 development board is powered on and the necessary pins are configured. Wi-Fi connectivity is established by connecting to the specified network.

·       Sensor Reading: The hydrogen gas sensor's analog output is read using the “analogRead()" function. The raw sensor value is then mapped to a meaningful range.

 

Testing:

·       To ensure the proper functioning of the Hydrogen Gas Monitoring System, the following testing steps can be performed.

·       Power up the system: Connect the power supply to the system and ensure that all components are properly powered.

·       Wi-Fi connectivity: Verify that the system successfully connects to the specified Wi-Fi network. Monitor the serial output to check for any error messages related to Wi-Fi connectivity.

·       Sensor readings: Observe the LCD display to ensure that the hydrogen gas readings are being displayed accurately. The readings should update every 5 seconds according to the specified delay.

·       Data upload: Monitor the serial output to check if the system successfully uploads the hydrogen gas readings to the Firebase database. Cross-reference the readings displayed on the LCD with the data stored in the Fircbase database to verify their accuracy

·       Remote access: Access the Firebasce database using the specified credentials and verify that the hydrogen gas readings are being stored correctly. Check if the readings correspond to the values displayed on the LCD.

·       Continuous monitoring: Keep the system running for an extended period of time and observe its performance. Ensure that the system maintains stable Wi-Fi connectivity and consistently uploads accurate hydrogen gas readings to the Firebase database.

·       System reliability: Test the system's reliability by subjecting it to different environmental conditions and monitoring its performance. Introduce varying levels of hydrogen gas in the vicinity of the sensor and verify if the system responds accordingly and provides accurate readings.

·       User interface: Evaluate the user interface provided by the LCD display. Check if the hydrogen gas readings are clearly visible and if the LCD backlight is functioning properly.