Published October 7, 2023 © GPL3+

Build Your Own Wireless Mini-Weather Station.🎉

The beauty of local, self-contained communication systems in which Boards, whisper secrets to each other, without an internet connection.

BeginnerFull instructions provided1 hour547

Build Your Own Wireless Mini-Weather Station.🎉

Things used in this project

Hardware components

Adafruit 0.66 OLED Display

Espressif Wemos D1 Mini

Bosch Wemos Bmp180

96Boards wemos dual board adapter

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

Story

INTRODUCTION

Here we learn how to establish a seamless Wi-Fi connection between two boards, enabling them to communicate and exchange data without the need for internet connectivity or a traditional router. We dive into the heart of IoT technology and witness the power of local network communication, empowering devices to interact intelligently and efficiently.

OVERVIEW

In this project, I have created a client-server architecture where one ESP8266 Wemos board acts as the server, while the other functions as the client. The server board hosts a web server and listens for incoming client requests. Upon receiving a request from the client, it responds with the desired data. This communication happens over a local Wi-Fi network, allowing the boards to interact without any physical connection.

Project Steps

1. Hardware Setup

Connect the two ESP8266 boards to your computer using USB cables. Ensure they are powered up and ready for programming.

1 / 2 • Server

2. Programming the Server Board

Copy and upload the server-side Arduino sketch to the first ESP8266 board. This sketch initializes a Wi-Fi server, listens for incoming client requests, and responds with the required data.

3. Programming the Client Board

Copy and upload the client-side Arduino sketch to the second ESP8266 board. This sketch establishes a Wi-Fi client connection with the server board, sends a request, and displays the received data.

4. Testing the Communication

Power up both boards and observe the OLED Display on the client board. You should see successful communication between the boards, demonstrating the client requesting data from the server.

Nice display of data from the server.

Conclusion

Congratulations! You have successfully set up a client-server Wi-Fi communication system between two ESP8266 NodeMCU boards. This project is a foundation for various IoT applications where devices can communicate wirelessly, opening up a world of possibilities for automation and remote control.

Feel free to explore and expand upon this project. You can add sensors, integrate with cloud services, or control physical devices based on the received data. The potential for innovation is boundless!

Thank you for following along with this tutorial. If you have any questions or want to share your experiences, please don't hesitate to reach out. Mail me. For software modification or Remote web flashing, without the hassle of coding.

Happy hacking!

Code

#include <ESP8266WiFi.h>
#include "ESPAsyncWebServer.h"
#include <Wire.h>
#include <Adafruit_BMP085.h>  // BMP180 library

// Set your access point network credentials
const char* ssid = "BMP180";
const char* password = "12345678";

Adafruit_BMP085 bmp;  // BMP180 sensor

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

String readTemp() {
  return String(bmp.readTemperature());
}

String readPres() {
  return String(bmp.readPressure() / 100.0F); // Convert pressure to hPa
}

void setup(){
  // Serial port for debugging purposes
  Serial.begin(115200);
  Serial.println();
  
  // Setting the ESP as an access point
  Serial.print("Setting AP (Access Point)...");
  // Remove the password parameter, if you want the AP (Access Point) to be open
  WiFi.softAP(ssid, password);

  IPAddress IP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(IP);

  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readTemp().c_str());
  });

  server.on("/pressure", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", readPres().c_str());
  });
  
  if (!bmp.begin()) {
    Serial.println("Could not find a valid BMP180 sensor, check wiring!");
    while (1);
  }
  
  // Start server
  server.begin();
}
 
void loop(){
  // Your loop code, if needed
}

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h> // Updated HTTPClient library for ESP8266

const char* ssid = "BMP180";
const char* password = "12345678";

const char* serverNameTemp = "http://192.168.4.1/temperature";
const char* serverNamePres = "http://192.168.4.1/pressure";

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64 // Update this to match your display resolution
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

String temperature;
String pressure;

unsigned long previousMillis = 0;
const long interval = 5000;

void setup() {
  Serial.begin(115200);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    if (WiFi.status() == WL_CONNECTED) {
      temperature = httpGETRequest(serverNameTemp);
      pressure = httpGETRequest(serverNamePres);

      display.clearDisplay();
      display.setCursor(35, 18);
      display.print("Temperatur");
      display.setCursor(40, 30);
      display.print(":" + temperature + "*C");// temperature in degree symbol
      display.setCursor(35, 42);
      display.print("Pressure");
      display.setCursor(35, 55);
      display.print(":" + pressure + "Pa");

      display.display();

      previousMillis = currentMillis;
    } else {
      Serial.println("WiFi Disconnected");
    }

Credits

TIMOTHY MWALA

24 projects • 14 followers

I am an Embedded engineer who like prototyping

Build Your Own Wireless Mini-Weather Station.🎉

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Project Steps

1. Hardware Setup

2. Programming the Server Board

3. Programming the Client Board

Conclusion

Schematics

set up

Code

Server Code

Client Code

Credits

TIMOTHY MWALA

Comments

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Build Your Own Wireless Mini-Weather Station.🎉

Build Your Own Wireless Mini-Weather Station.🎉

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Project Steps

1. Hardware Setup

2. Programming the Server Board

3. Programming the Client Board

Conclusion

Schematics

set up

Code

Server Code

Client Code

Credits

TIMOTHY MWALA

Comments

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