Smart Weather Station with ESP8266, BMP180, DHT11, and MQ135 Sensors — Local SD Card Storage and Web-Based Monitoring

This project is a smart weather station built using the ESP8266 microcontroller integrated with multiple environmental sensors — BMP180 for pressure and altitude, DHT11 for temperature and humidity, and MQ135 for air quality monitoring. It continuously collects real-time weather data and air quality measurements, providing valuable insights into local environmental conditions. The system stores all sensor readings locally on an SD card for reliable data logging and historical analysis. Additionally, it features an intuitive LCD display to show live sensor data and weather predictions based on temperature, humidity, air quality, and pressure trends. For remote accessibility, the station hosts a web server, allowing users to monitor current weather and air quality information via a user-friendly webpage accessible over WiFi. This combination of local data storage, real-time display, and web-based monitoring makes the system ideal for hobbyists, researchers, and smart home enthusiasts looking for a comprehensive and affordable environmental monitoring solution.

May 25, 2025

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3 respects

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GPL3+

Devices & Components

16x2 LCD display with I²C interface

DHT11 Temperature & Humidity Sensor (4 pins)

Bmp 180

4GB or Larger Micro SD Card

esp8266 NodeMCU

Air Quality sensor (MQ135)

SD card reader/writer

rtc DS1307

5V Power Supply Module

Hardware & Tools

Soldering kit

Wire cutter

Software & Tools

Arduino IDE

Project description

Code

Weather

weather

1#include <Wire.h>
2#include <LiquidCrystal_I2C.h>
3#include "uRTCLib.h"
4#include <DHT.h>
5#include <Adafruit_BMP085.h> // Library handles both BMP085 and BMP180
6#include <SPI.h>
7#include <SD.h>
8#include <ESP8266WiFi.h>
9#include <ESP8266WebServer.h>
10
11// ----------- Configuration -----------
12#define SDA_PIN D2
13#define SCL_PIN D1
14#define MQ135_PIN A0
15#define DHTPIN D4
16#define DHTTYPE DHT11
17#define LCD_ADDR 0x27
18#define SD_CS D8 // Corrected SD_CS pin for ESP8266 (e.g., D8/GPIO15 often used with default SPI)
19
20// <-- Add your WiFi SSID and Password here
21const char* ssid = ""; 
22const char* password = "";
23
24// Threshold for pressure change (in Pa, or 0.1 hPa)
25// A common rule of thumb for "significant change" is around 2-3 hPa over a few hours.
26// Adjust this value based on how sensitive you want the pressure trend detection to be.
27#define PRESSURE_CHANGE_THRESHOLD 200 // 200 Pa = 2 hPa
28
29// ----------- Objects -----------
30LiquidCrystal_I2C lcd(LCD_ADDR, 16, 2);
31uRTCLib rtc;
32DHT dht(DHTPIN, DHTTYPE);
33Adafruit_BMP085 bmp;
34ESP8266WebServer server(80);
35File myFile;
36
37// ----------- Globals -----------
38float temp, hum, airQuality;
39float bmpTemp, pressure, altitude, seaLevelPressure;
40float previousPressure = 0.0; // To store the last pressure reading for trend analysis
41String tempStatus, humStatus, airStatus, prediction;
42String currentDate, currentTime;
43String predictionMessage;
44char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
45String pressureTrendStatus; // "Rising", "Falling", "Stable"
46
47// ----------- Helper Functions -----------
48
49void updateDateTime() {
50  rtc.refresh();
51  currentDate = String(rtc.day()) + "-" + String(rtc.month()) + "-" + String(rtc.year());
52  currentTime = String(rtc.hour()) + ":" + String(rtc.minute()) + ":" + String(rtc.second());
53}
54
55void displayLCD(const String& line1, const String& line2) {
56  lcd.clear();
57  lcd.setCursor(0, 0); lcd.print(line1);
58  lcd.setCursor(0, 1); lcd.print(line2);
59}
60
61void readSensors() {
62  airQuality = analogRead(MQ135_PIN);
63  temp = dht.readTemperature();
64  hum = dht.readHumidity();
65
66  // Store current pressure as previous for next cycle
67  previousPressure = pressure;
68
69  // Read BMP085 sensor data
70  bmpTemp = bmp.readTemperature();
71  pressure = bmp.readPressure();
72  altitude = bmp.readAltitude();
73  seaLevelPressure = bmp.readSealevelPressure();
74
75  // Determine pressure trend
76  if (abs(pressure - previousPressure) < PRESSURE_CHANGE_THRESHOLD || previousPressure == 0.0) {
77    pressureTrendStatus = "Stable";
78  } else if (pressure > previousPressure) {
79    pressureTrendStatus = "Rising";
80  } else {
81    pressureTrendStatus = "Falling";
82  }
83}
84
85String generatePrediction() {
86  if (temp > 35) tempStatus = "Hot";
87  else if (temp > 25) tempStatus = "Warm";
88  else if (temp > 15) tempStatus = "Cool";
89  else tempStatus = "Cold";
90
91  if (hum > 80) humStatus = "Very Humid";
92  else if (hum > 60) humStatus = "Humid";
93  else if (hum < 30) humStatus = "Dry";
94  else humStatus = "Normal";
95
96  if (airQuality > 900) airStatus = "Hazardous";
97  else if (airQuality > 700) airStatus = "Poor";
98  else if (airQuality > 500) airStatus = "Moderate";
99  else airStatus = "Good";
100
101  // --- Prediction logic including pressure trend ---
102  if (airStatus == "Hazardous") prediction = "Stay indoors!";
103  else if (airStatus == "Poor") prediction = "Wear a mask!";
104  else if (tempStatus == "Hot" && humStatus == "Humid") prediction = "Heat risk!";
105  else if (tempStatus == "Cold" && humStatus == "Very Humid") prediction = "Cold & damp!";
106  else if (tempStatus == "Cold" && airStatus == "Poor") prediction = "Cold+Pollution!";
107  else if (pressureTrendStatus == "Falling" && hum > 70) prediction = "Rain likely!"; // Falling pressure + high humidity
108  else if (pressureTrendStatus == "Falling") prediction = "Expect change!"; // General falling pressure
109  else if (pressureTrendStatus == "Rising" && temp > 15) prediction = "Improving weather!"; // Rising pressure, not too cold
110  else if (pressureTrendStatus == "Rising") prediction = "Clearer skies!"; // General rising pressure
111  else if (tempStatus == "Warm" && humStatus == "Normal" && airStatus == "Good") prediction = "Perfect!";
112  else if (tempStatus == "Cool" && humStatus == "Dry" && airStatus == "Good") prediction = "Pleasant!";
113  else prediction = "Mild Weather"; // Default if no specific condition met
114
115  // --- Displaying ALL sensor data on LCD in a sequence ---
116  displayLCD("Temp: " + String(temp, 1) + (char)223 + "C", "(" + tempStatus + ")");
117  delay(3000);
118
119  displayLCD("Humidity: " + String(hum, 1) + "%", "(" + humStatus + ")");
120  delay(3000);
121
122  displayLCD("Air Qual: " + String((int)airQuality), "(" + airStatus + ")");
123  delay(3000);
124
125  displayLCD("BMP Temp: " + String(bmpTemp, 1) + (char)223 + "C", ""); // BMP Temp
126  delay(3000);
127
128  displayLCD("Pressure: " + String(pressure / 100.0, 1) + "hPa", "(" + pressureTrendStatus.substring(0,10) + ")"); // Pressure in hPa with trend
129  delay(3000);
130
131  displayLCD("Altitude: " + String(altitude, 1) + "m", ""); // Altitude
132  delay(3000);
133
134  displayLCD("Prediction:", prediction.substring(0, 16));
135  delay(4000);
136  // --- End of LCD display sequence ---
137
138
139  // Serial Monitor Output (all parameters, including BMP085 data)
140  Serial.println("\n--- Sensor Readings ---");
141  Serial.println("Date: " + currentDate + ", Time: " + currentTime);
142  Serial.println("DHT Temp: " + String(temp, 1) + "C (" + tempStatus + ")");
143  Serial.println("Humidity: " + String(hum, 1) + "% (" + humStatus + ")");
144  Serial.println("Air Quality: " + String(airQuality) + " (" + airStatus + ")");
145  Serial.println("BMP Temp: " + String(bmpTemp, 1) + "C");
146  Serial.println("Pressure: " + String(pressure / 100.0, 2) + " hPa (" + pressureTrendStatus + ")"); // Convert Pa to hPa
147  Serial.println("Altitude: " + String(altitude, 2) + " m");
148  Serial.println("Sea Level Pres: " + String(seaLevelPressure / 100.0, 2) + " hPa");
149  Serial.println("Prediction: " + prediction);
150  Serial.println("-----------------------\n");
151
152  return prediction;
153}
154
155void logToSDCard() {
156  String log = currentDate + "," + currentTime + "," +
157               String(hum, 2) + "," + String(temp, 2) + "," + String(airQuality, 0) + "," +
158               String(pressure, 2) + "," + String(bmpTemp, 2) + "," + String(altitude, 2) + "," +
159               String(seaLevelPressure, 2) + "," + pressureTrendStatus; // Added pressure trend to log
160
161  myFile = SD.open("Data.txt", FILE_WRITE);
162  if (myFile) {
163    myFile.println(log);
164    myFile.close();
165    Serial.println("Logged to SD: " + log);
166  } else {
167    Serial.println("Error opening Data.txt for logging.");
168  }
169}
170
171void logPrediction(String pred) {
172  myFile = SD.open("Prediction.txt", FILE_WRITE);
173  if (myFile) {
174    myFile.println(currentDate + "," + currentTime + "," + pred);
175    myFile.close();
176    Serial.println("Logged prediction to SD: " + pred);
177  } else {
178    Serial.println("Error opening Prediction.txt for logging.");
179  }
180}
181
182void handleRoot() {
183  String html = "<html><head><meta http-equiv='refresh' content='15'><style>body{font-family: Arial, sans-serif; text-align:center; background-color: #f0f0f0; margin-top: 50px;} h2{color:#333;} p{color:#666; font-size:1.1em;}</style></head><body>";
184  html += "<h2>ESP8266 Weather Station</h2>";
185  html += "<p>Date: <b>" + currentDate + "</b></p>";
186  html += "<p>Time: <b>" + currentTime + "</b></p>";
187  html += "<p>DHT Temperature: <b>" + String(temp, 1) + "&deg;C</b> (" + tempStatus + ")</p>";
188  html += "<p>Humidity: <b>" + String(hum, 1) + "%</b> (" + humStatus + ")</p>";
189  html += "<p>Air Quality (MQ135): <b>" + String(airQuality, 0) + "</b> (" + airStatus + ")</p>";
190  html += "<hr>";
191  html += "<p>BMP Temperature: <b>" + String(bmpTemp, 1) + "&deg;C</b></p>";
192  html += "<p>Pressure: <b>" + String(pressure / 100.0, 2) + " hPa</b> (" + pressureTrendStatus + ")</p>";
193  html += "<p>Altitude: <b>" + String(altitude, 2) + " m</b></p>";
194  html += "<p>Sea Level Pressure: <b>" + String(seaLevelPressure / 100.0, 2) + " hPa</b></p>";
195  html += "<hr>";
196  html += "<p><strong>Weather Prediction:</strong> " + prediction + "</p>";
197  html += "</body></html>";
198  server.send(200, "text/html", html);
199}
200
201// ----------- Setup -----------
202void setup() {
203
204// Uncomment this block to set RTC time once, then comment again after upload
205/*
206  rtc.set(2025, 5, 25, 0, 15, 30, 0);
207  // Format: rtc.set(YYYY, MM, DD, DayOfWeek, HH, MM, SS)
208  // DayOfWeek: 0 = Sunday, 1 = Monday, ..., 6 = Saturday
209  Serial.println("RTC time set.");
210  while (1); // Halt to prevent resetting repeatedly
211*/
212
213
214  Serial.begin(9600);
215  Wire.begin(SDA_PIN, SCL_PIN);
216  URTCLIB_WIRE.begin();
217  lcd.init(); lcd.backlight();
218  lcd.setCursor(0, 0); lcd.print("Starting...");
219  delay(2000);
220  dht.begin();
221
222  if (!bmp.begin()) {
223    Serial.println("Could not find a valid BMP085/BMP180 sensor, check wiring!");
224    displayLCD("BMP180 Error!", "Check Wiring!");
225    while (1) {} // Halt if BMP085 is not found
226  } else {
227    Serial.println("BMP180 sensor found.");
228  }
229
230  // Initialize SD Card
231  if (!SD.begin(SD_CS)) {
232    Serial.println("SD Card init failed!");
233    displayLCD("SD Card Error!", "Check Wiring!");
234    // You might want to halt here or continue without SD logging
235  } else {
236    Serial.println("SD Card initialized.");
237  }
238
239  WiFi.begin(ssid, password);
240  Serial.print("Connecting to WiFi");
241  while (WiFi.status() != WL_CONNECTED) {
242    delay(500); Serial.print(".");
243  }
244
245  IPAddress ip = WiFi.localIP();
246  lcd.clear();
247  lcd.setCursor(0, 0); lcd.print("WiFi Connected");
248  lcd.setCursor(0, 1); lcd.print(ip.toString());
249  delay(3000);
250  Serial.println("\nWiFi connected. IP: " + ip.toString());
251
252  server.on("/", handleRoot);
253  server.begin();
254  Serial.println("HTTP server started");
255}
256
257// ----------- Loop -----------
258void loop() {
259  updateDateTime();
260  readSensors(); // This now updates previousPressure and calculates pressureTrendStatus
261  displayLCD("Date: " + currentDate, "Time: " + currentTime);
262  delay(3000);
263  predictionMessage = generatePrediction(); // This now uses pressureTrendStatus
264  logToSDCard();
265  logPrediction(predictionMessage);
266  server.handleClient();
267  delay(5000); // Add a small delay at the end of the loop
268}

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "uRTCLib.h"
#include <DHT.h>
#include <Adafruit_BMP085.h> // Library handles both BMP085 and BMP180
#include <SPI.h>
#include <SD.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

// ----------- Configuration -----------
#define SDA_PIN D2
#define SCL_PIN D1
#define MQ135_PIN A0
#define DHTPIN D4
#define DHTTYPE DHT11
#define LCD_ADDR 0x27
#define SD_CS D8 // Corrected SD_CS pin for ESP8266 (e.g., D8/GPIO15 often used with default SPI)

// <-- Add your WiFi SSID and Password here
const char* ssid = ""; 
const char* password = "";

// Threshold for pressure change (in Pa, or 0.1 hPa)
// A common rule of thumb for "significant change" is around 2-3 hPa over a few hours.
// Adjust this value based on how sensitive you want the pressure trend detection to be.
#define PRESSURE_CHANGE_THRESHOLD 200 // 200 Pa = 2 hPa

// ----------- Objects -----------
LiquidCrystal_I2C lcd(LCD_ADDR, 16, 2);
uRTCLib rtc;
DHT dht(DHTPIN, DHTTYPE);
Adafruit_BMP085 bmp;
ESP8266WebServer server(80);
File myFile;

// ----------- Globals -----------
float temp, hum, airQuality;
float bmpTemp, pressure, altitude, seaLevelPressure;
float previousPressure = 0.0; // To store the last pressure reading for trend analysis
String tempStatus, humStatus, airStatus, prediction;
String currentDate, currentTime;
String predictionMessage;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
String pressureTrendStatus; // "Rising", "Falling", "Stable"

// ----------- Helper Functions -----------

void updateDateTime() {
  rtc.refresh();
  currentDate = String(rtc.day()) + "-" + String(rtc.month()) + "-" + String(rtc.year());
  currentTime = String(rtc.hour()) + ":" + String(rtc.minute()) + ":" + String(rtc.second());
}

void displayLCD(const String& line1, const String& line2) {
  lcd.clear();
  lcd.setCursor(0, 0); lcd.print(line1);
  lcd.setCursor(0, 1); lcd.print(line2);
}

void readSensors() {
  airQuality = analogRead(MQ135_PIN);
  temp = dht.readTemperature();
  hum = dht.readHumidity();

  // Store current pressure as previous for next cycle
  previousPressure = pressure;

  // Read BMP085 sensor data
  bmpTemp = bmp.readTemperature();
  pressure = bmp.readPressure();
  altitude = bmp.readAltitude();
  seaLevelPressure = bmp.readSealevelPressure();

  // Determine pressure trend
  if (abs(pressure - previousPressure) < PRESSURE_CHANGE_THRESHOLD || previousPressure == 0.0) {
    pressureTrendStatus = "Stable";
  } else if (pressure > previousPressure) {
    pressureTrendStatus = "Rising";
  } else {
    pressureTrendStatus = "Falling";
  }
}

String generatePrediction() {
  if (temp > 35) tempStatus = "Hot";
  else if (temp > 25) tempStatus = "Warm";
  else if (temp > 15) tempStatus = "Cool";
  else tempStatus = "Cold";

  if (hum > 80) humStatus = "Very Humid";
  else if (hum > 60) humStatus = "Humid";
  else if (hum < 30) humStatus = "Dry";
  else humStatus = "Normal";

  if (airQuality > 900) airStatus = "Hazardous";
  else if (airQuality > 700) airStatus = "Poor";
  else if (airQuality > 500) airStatus = "Moderate";
  else airStatus = "Good";

  // --- Prediction logic including pressure trend ---
  if (airStatus == "Hazardous") prediction = "Stay indoors!";
  else if (airStatus == "Poor") prediction = "Wear a mask!";
  else if (tempStatus == "Hot" && humStatus == "Humid") prediction = "Heat risk!";
  else if (tempStatus == "Cold" && humStatus == "Very Humid") prediction = "Cold & damp!";
  else if (tempStatus == "Cold" && airStatus == "Poor") prediction = "Cold+Pollution!";
  else if (pressureTrendStatus == "Falling" && hum > 70) prediction = "Rain likely!"; // Falling pressure + high humidity
  else if (pressureTrendStatus == "Falling") prediction = "Expect change!"; // General falling pressure
  else if (pressureTrendStatus == "Rising" && temp > 15) prediction = "Improving weather!"; // Rising pressure, not too cold
  else if (pressureTrendStatus == "Rising") prediction = "Clearer skies!"; // General rising pressure
  else if (tempStatus == "Warm" && humStatus == "Normal" && airStatus == "Good") prediction = "Perfect!";
  else if (tempStatus == "Cool" && humStatus == "Dry" && airStatus == "Good") prediction = "Pleasant!";
  else prediction = "Mild Weather"; // Default if no specific condition met

  // --- Displaying ALL sensor data on LCD in a sequence ---
  displayLCD("Temp: " + String(temp, 1) + (char)223 + "C", "(" + tempStatus + ")");
  delay(3000);

  displayLCD("Humidity: " + String(hum, 1) + "%", "(" + humStatus + ")");
  delay(3000);

  displayLCD("Air Qual: " + String((int)airQuality), "(" + airStatus + ")");
  delay(3000);

  displayLCD("BMP Temp: " + String(bmpTemp, 1) + (char)223 + "C", ""); // BMP Temp
  delay(3000);

  displayLCD("Pressure: " + String(pressure / 100.0, 1) + "hPa", "(" + pressureTrendStatus.substring(0,10) + ")"); // Pressure in hPa with trend
  delay(3000);

  displayLCD("Altitude: " + String(altitude, 1) + "m", ""); // Altitude
  delay(3000);

  displayLCD("Prediction:", prediction.substring(0, 16));
  delay(4000);
  // --- End of LCD display sequence ---


  // Serial Monitor Output (all parameters, including BMP085 data)
  Serial.println("\n--- Sensor Readings ---");
  Serial.println("Date: " + currentDate + ", Time: " + currentTime);
  Serial.println("DHT Temp: " + String(temp, 1) + "C (" + tempStatus + ")");
  Serial.println("Humidity: " + String(hum, 1) + "% (" + humStatus + ")");
  Serial.println("Air Quality: " + String(airQuality) + " (" + airStatus + ")");
  Serial.println("BMP Temp: " + String(bmpTemp, 1) + "C");
  Serial.println("Pressure: " + String(pressure / 100.0, 2) + " hPa (" + pressureTrendStatus + ")"); // Convert Pa to hPa
  Serial.println("Altitude: " + String(altitude, 2) + " m");
  Serial.println("Sea Level Pres: " + String(seaLevelPressure / 100.0, 2) + " hPa");
  Serial.println("Prediction: " + prediction);
  Serial.println("-----------------------\n");

  return prediction;
}

void logToSDCard() {
  String log = currentDate + "," + currentTime + "," +
               String(hum, 2) + "," + String(temp, 2) + "," + String(airQuality, 0) + "," +
               String(pressure, 2) + "," + String(bmpTemp, 2) + "," + String(altitude, 2) + "," +
               String(seaLevelPressure, 2) + "," + pressureTrendStatus; // Added pressure trend to log

  myFile = SD.open("Data.txt", FILE_WRITE);
  if (myFile) {
    myFile.println(log);
    myFile.close();
    Serial.println("Logged to SD: " + log);
  } else {
    Serial.println("Error opening Data.txt for logging.");
  }
}

void logPrediction(String pred) {
  myFile = SD.open("Prediction.txt", FILE_WRITE);
  if (myFile) {
    myFile.println(currentDate + "," + currentTime + "," + pred);
    myFile.close();
    Serial.println("Logged prediction to SD: " + pred);
  } else {
    Serial.println("Error opening Prediction.txt for logging.");
  }
}

void handleRoot() {
  String html = "<html><head><meta http-equiv='refresh' content='15'><style>body{font-family: Arial, sans-serif; text-align:center; background-color: #f0f0f0; margin-top: 50px;} h2{color:#333;} p{color:#666; font-size:1.1em;}</style></head><body>";
  html += "<h2>ESP8266 Weather Station</h2>";
  html += "<p>Date: <b>" + currentDate + "</b></p>";
  html += "<p>Time: <b>" + currentTime + "</b></p>";
  html += "<p>DHT Temperature: <b>" + String(temp, 1) + "&deg;C</b> (" + tempStatus + ")</p>";
  html += "<p>Humidity: <b>" + String(hum, 1) + "%</b> (" + humStatus + ")</p>";
  html += "<p>Air Quality (MQ135): <b>" + String(airQuality, 0) + "</b> (" + airStatus + ")</p>";
  html += "<hr>";
  html += "<p>BMP Temperature: <b>" + String(bmpTemp, 1) + "&deg;C</b></p>";
  html += "<p>Pressure: <b>" + String(pressure / 100.0, 2) + " hPa</b> (" + pressureTrendStatus + ")</p>";
  html += "<p>Altitude: <b>" + String(altitude, 2) + " m</b></p>";
  html += "<p>Sea Level Pressure: <b>" + String(seaLevelPressure / 100.0, 2) + " hPa</b></p>";
  html += "<hr>";
  html += "<p><strong>Weather Prediction:</strong> " + prediction + "</p>";
  html += "</body></html>";
  server.send(200, "text/html", html);
}

// ----------- Setup -----------
void setup() {

// Uncomment this block to set RTC time once, then comment again after upload
/*
  rtc.set(2025, 5, 25, 0, 15, 30, 0);
  // Format: rtc.set(YYYY, MM, DD, DayOfWeek, HH, MM, SS)
  // DayOfWeek: 0 = Sunday, 1 = Monday, ..., 6 = Saturday
  Serial.println("RTC time set.");
  while (1); // Halt to prevent resetting repeatedly
*/


  Serial.begin(9600);
  Wire.begin(SDA_PIN, SCL_PIN);
  URTCLIB_WIRE.begin();
  lcd.init(); lcd.backlight();
  lcd.setCursor(0, 0); lcd.print("Starting...");
  delay(2000);
  dht.begin();

  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP085/BMP180 sensor, check wiring!");
    displayLCD("BMP180 Error!", "Check Wiring!");
    while (1) {} // Halt if BMP085 is not found
  } else {
    Serial.println("BMP180 sensor found.");
  }

  // Initialize SD Card
  if (!SD.begin(SD_CS)) {
    Serial.println("SD Card init failed!");
    displayLCD("SD Card Error!", "Check Wiring!");
    // You might want to halt here or continue without SD logging
  } else {
    Serial.println("SD Card initialized.");
  }

  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500); Serial.print(".");
  }

  IPAddress ip = WiFi.localIP();
  lcd.clear();
  lcd.setCursor(0, 0); lcd.print("WiFi Connected");
  lcd.setCursor(0, 1); lcd.print(ip.toString());
  delay(3000);
  Serial.println("\nWiFi connected. IP: " + ip.toString());

  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");
}

// ----------- Loop -----------
void loop() {
  updateDateTime();
  readSensors(); // This now updates previousPressure and calculates pressureTrendStatus
  displayLCD("Date: " + currentDate, "Time: " + currentTime);
  delay(3000);
  predictionMessage = generatePrediction(); // This now uses pressureTrendStatus
  logToSDCard();
  logPrediction(predictionMessage);
  server.handleClient();
  delay(5000); // Add a small delay at the end of the loop
}

Documentation

Project Report

Wire Connection, Algorithm, Block Diagram & List

Final_Report_Weather_Perdiction.pdf

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