BME 280 – Node MCU Weather Station

BME 280 – Node MCU Weather Station

Scenario : You want to design a LAN based weather station which can be accessed from LAN.

Items Needed :

ESP-12E – NODE MCU Board

BME 280 – Sensor

Pin Configuration

Pin Number D2 ESP — > SDA Pin BMP/BME 280

Pin Number D1 ESP — > SCL Pin BMP/BME 280

Pin Number 3V3 ESP — > VIN Pin BMP/BME 280

Pin Number GND ESP — > GND Pin BMP/BME 280

Ste1p : install NodeMCU board Manager to Arduino

Add the Adafruit BusIO library

Once the above steps finished paste below code and upload to nodemcu

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

//uncomment the following lines if you are using SPI
/*#include <SPI.h>
#define BME_SCK 18
#define BME_MISO 19
#define BME_MOSI 23
#define BME_CS 5*/

#define SEALEVELPRESSURE_HPA (1012.00)

Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI

// Replace with your network credentials
const char* ssid     = "wifiname"; // WIFI SSID CHANGE
const char* password = "password"; // WIFI PASWORD CHANGE
// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;

void setup() {
  bool status;

  // default settings
  // (you can also pass in a Wire library object like &Wire2)
  //status = bme.begin();  
  if (!bme.begin(0x76)) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);

  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
  // Print local IP address and start web server
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");

void loop(){
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c =;             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Connection: close");
            // 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: #27AD4F; color: white; }");
            client.println("tr { border: 1px solid #ddd; padding: 12px; }");
            client.println("tr:hover { background-color: #B6FF00; }");
            client.println("td { border: none; padding: 12px; }");
            client.println(".sensor { color:white; font-weight: bold; background-color: #B6FF00; padding: 1px; }");
             // Web Page Heading
            client.println("</style></head><body><h1>BME280 sensor module</h1>");
             client.println("<tr><td>Altitude approx.</td><td><span class=\"sensor\">");
            client.println(" mtrs</span></td></tr>"); 
            client.println("<tr><td>Humidity</td><td><span class=\"sensor\">");
            client.println(" %</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>Temperature Cels.</td><td><span class=\"sensor\">");
            client.println(" *C</span></td></tr>");  
            client.println("<tr><td>Temperature Fahr.</td><td><span class=\"sensor\">");
            client.println(1.8 * bme.readTemperature() + 32);
            client.println(" *F</span></td></tr>");
            // The HTTP response ends with another blank line
            // Break out of the while loop
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
    // Clear the header variable
    header = "";
    // Close the connection
    Serial.println("Client disconnected.");

Make sure to edit two lines and replace your wifi SSID and Password

From Serial Monitor find out the IP Address

Once you have IP address, open the IP from any browser.