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Published November 14, 2020 © CC BY

Weather station on screen

We can easily get the weather data of the city we live in with the help of smartphones

BeginnerFull instructions provided1 hour984

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

DHT11 Temperature & Humidity Sensor (4 pins)

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Components Used

1 DHT11

DHT11 is a single wire digital humidity and temperature sensor, which gives relative humidity in percentage and temperature in degree Celsius.

1 Node Mcu (Esp8266)

This will work as the brigde to send the data to thingspeak from DHT11 sensor module1 Wiresfor connection

1 USB cable

cable need for connection of nodemcu esp8266 and laptop

The weather station project uses an esp8266 Nodemcu microcontroller board and a DHT11 temperature and relative humidity sensor module. The microcontroller receives the data from the DHT11 sensor and acts as a bridge in sending the data to the Thingspeak website, which I have used to plot the temperature and relative humidity as a graph and also on a gauge.

Visualisation of the results

The connections are easy as well. The wires go as follows:

The VCC pin of DHT11 goes to the 3V pin of the Nodemcu.
The GND pin of DHT11 goes to the GND pin of Nodemcu.
The data pin goes to GPIO0 (D3) of NVisualizationodemcu.

The connections are done. Connect the microcontroller to the laptop or PC and then the microcontroller is programmed.

The DHT11 sensor gives the relative humidity and temperature data. The Nodemcu is programmed using the Arduino IDE so as to receive the data. Then the Nodemcu uses the HTTP POST request method to communicate with the Thingspeak website. The Thingspeak account has unique API keys which is used to communicate with the website.

The channel settings of the website.

The HyperText Transfer Protocol acts works as a request-response protocol between the client and the server. Understanding how the HTTP protocol can be programmed will be very helpful in building the project. Generally, when using esp8266 Nodemcu board:

The esp8266 Nodemcu acts as the client and submits an HTTP request to the server. In this project, the server corresponds to the Thingspeak website.
The server returns a response to the client.
finally, the response will contain the status information about the request and also might contain the content. Here the result is the graphs we see on Thingspeak.

The code has been added to the upcoming page.

ESP8266 Nodemcu Microcontroller

Dht11

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Code

Code

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <DHT.h>

#define DHTPIN 0

DHT dht(DHTPIN,DHT11);

const char* ssid = "Rail Net";
const char* password = "sharan*123*";


const char* serverName = "http://api.thingspeak.com/update";
// Service API Key
String apiKey = "2SED294GR9XL0U7C";


unsigned long lastTime = 0;
unsigned long timerDelay = 10000;

void setup() {
  Serial.begin(9600);

  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());
 
  Serial.println("Timer set to 10 seconds (timerDelay variable), it will take 10 seconds before publishing the first reading.");

  randomSeed(analogRead(0));
}

void loop() {
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  
  if ((millis() - lastTime) > timerDelay) {
   
    if(WiFi.status()== WL_CONNECTED){
      HTTPClient http;
      
     
      http.begin(serverName);
      

      http.addHeader("Content-Type", "application/x-www-form-urlencoded");

      String httpRequestData = "api_key=" + apiKey + "&field1=" + String(t)+ "&field2=" + String(h);           

      int httpResponseCode = http.POST(httpRequestData);
      
     
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
        

      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

Credits

Daini

31 projects • 17 followers

Weather station on screen

Things used in this project

Hardware components

Software apps and online services

Story

High Quality PCBs From NEXTPCB

Schematics

Schematic For this project

Code

Code

Credits

Daini

Comments

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Weather station on screen

Weather station on screen

Things used in this project

Hardware components

Software apps and online services

Story

High Quality PCBs From NEXTPCB

Schematics

Schematic For this project

Code

Code

Credits

Daini

Comments

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