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#include <Arduino.h>
#include <U8g2lib.h>
#include <ESP8266WiFi.h>
#include <Wire.h>
#include <Adafruit_BME280.h>
#include <Adafruit_Sensor.h>


U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme;

// Replace with your network credentials
const char* ssid = "ssid";
const char* password = "password";

int ledPin = 13;

// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;


void showBootScreen(){

  /*
    This is a function. you can call it anywhere in your code. Think of it as a macro -
    you can use a lot of commands that will be executed by only one command.
  */

  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_ncenB08_tr);
  u8g2.drawStr(48, 10, "CCMS");
  u8g2.drawStr(30, 21, "Earth Science");
  u8g2.drawStr(25, 31, "Weather Station");
  u8g2.drawStr(56, 60, "Ms. Duverge");
  u8g2.sendBuffer();

  delay(5000);

  u8g2.clear();
  delay(1000);

  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_ncenB08_tr);
  u8g2.drawStr(25, 30, "Visit our server");
  u8g2.drawStr(40, 41, "192.168.1.18");
  u8g2.sendBuffer();

  delay(30000);

}


void setup(){

  pinMode(ledPin,OUTPUT);
  digitalWrite(ledPin,LOW);

  Serial.begin(115200);

  u8g2.begin();

  if (!bme.begin(0x76)){
    Serial.println("BME SENSOR not found!! Check wireing!! Stopping execution!");

    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_ncenB08_tr);
    u8g2.drawStr(0, 10, "Could not find a valid BME280 sensor, check wiring!");

    for(;;){yield()}; // otherwise, your MCU will throw a WDT reset ;)
  }

  Serial.print("\n\nWifi connecting to");
  Serial.println(ssid);

  WiFi.begin(ssid,password);

  Serial.print("\nConnecting");

  while ( WiFi.status() != WL_CONNECTED ) {
    delay(500);
    Serial.print(".");
  }

  digitalWrite( ledPin , HIGH);

  Serial.println("\nWifi Connected Success!");
  Serial.print("NodeMCU IP Address : ");
  Serial.println(WiFi.localIP() );

  server.begin();

  showBootScreen();

}


void loop(void) {
  WiFiClient client = server.available();
  if (client){
    Serial.println("New Client!");
    String currentLine = "";
    while (client.connected()){
      if (client.available()){
        char c = client.read();
        Serial.write(c);
        header += c;
        if (c=='\n') {
          if (currentLine.length() == 0) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            // CSS to style the table
            client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\", Arial;}");
            client.println("table { border-collapse: collapse; width:35%; margin-left:auto; margin-right:auto; }");
            client.println("th { padding: 12px; background-color: #0043af; color: white; }");
            client.println("tr { border: 1px solid #ddd; padding: 12px; }");
            client.println("tr:hover { background-color: #bcbcbc; }");
            client.println("td { border: none; padding: 12px; }");
            client.println(".sensor { color:white; font-weight: bold; background-color: #bcbcbc; padding: 1px; }");

            // Web Page Heading
            client.println("</style></head><body><h1>CCMS Weather Station</h1>");
            client.println("<table><tr><th>MEASUREMENT</th><th>VALUE</th></tr>");
            client.println("<tr><td>Temp. Celsius</td><td><span class=\"sensor\">");
            client.println(bme.readTemperature());
            client.println(" *C</span></td></tr>");
            client.println("<tr><td>Temp. Fahrenheit</td><td><span class=\"sensor\">");
            client.println(1.8 * bme.readTemperature() + 32);
            client.println(" *F</span></td></tr>");
            client.println("<tr><td>Pressure</td><td><span class=\"sensor\">");
            client.println(bme.readPressure() / 100.0F);
            client.println(" hPa</span></td></tr>");
            client.println("<tr><td>Approx. Altitude</td><td><span class=\"sensor\">");
            client.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
            client.println(" m</span></td></tr>");
            client.println("<tr><td>Humidity</td><td><span class=\"sensor\">");
            client.println(bme.readHumidity());
            client.println(" %</span></td></tr>");
            client.println("</body></html>");

            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
            }else{
            currentLine="";
          }
          } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}