SMART WEATHER MONITOR WITH DHT11 AND ARDUINO UNO एक R4 WIFI

This project turns a simple DHT11 temperature and humidity sensor into a real-time, cloud-connected weather station. Using the Arduino UNO एक R4 WiFi, the data is sent to the Arduino IoT Cloud, where it can be monitored remotely via a custom dashboard. It’s a practical introduction to IoT, allowing anyone to track environmental data from anywhere, anytime.

Sep 10, 2025

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LGPL3+

Environmental Sensing

Devices & Components

SmartElex Bharat AI Innovators Kit Powered by Arduino

Software & Tools

Arduino Cloud Editor

Arduino IoT Cloud

Project description

Code

SMART WEATHER MONITOR WITH DHT11 AND ARDUINO UNO एक R4 WIFI

cpp

install arduino IoT agent

1#include "thingProperties.h"
2#include "DHT.h"
3
4#define DHTPIN 2      // Data pin connected to D2
5#define DHTTYPE DHT11 // DHT 11
6
7DHT dht(DHTPIN, DHTTYPE);
8
9void setup() {
10  Serial.begin(9600);
11  delay(1500);
12
13  // Connect to Arduino IoT Cloud
14  initProperties();
15  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
16
17  dht.begin();
18
19  setDebugMessageLevel(2);
20  ArduinoCloud.printDebugInfo();
21}
22
23void loop() {
24  ArduinoCloud.update();
25
26  // Read values from DHT11
27  float h = dht.readHumidity();
28  float t = dht.readTemperature();
29
30  // Check if readings are valid
31  if (isnan(h) || isnan(t)) {
32    Serial.println("Failed to read from DHT11 sensor!");
33    return;
34  }
35
36  // Update cloud variables
37  temperature = t;
38  humidity = h;
39
40  // Debug
41  Serial.print("Temperature: ");
42  Serial.print(t);
43  Serial.print(" °C  |  Humidity: ");
44  Serial.print(h);
45  Serial.println(" %");
46}

#include "thingProperties.h"
#include "DHT.h"

#define DHTPIN 2      // Data pin connected to D2
#define DHTTYPE DHT11 // DHT 11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  delay(1500);

  // Connect to Arduino IoT Cloud
  initProperties();
  ArduinoCloud.begin(ArduinoIoTPreferredConnection);

  dht.begin();

  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
}

void loop() {
  ArduinoCloud.update();

  // Read values from DHT11
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  // Check if readings are valid
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT11 sensor!");
    return;
  }

  // Update cloud variables
  temperature = t;
  humidity = h;

  // Debug
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" °C  |  Humidity: ");
  Serial.print(h);
  Serial.println(" %");
}

Downloadable files

SMART WEATHER MONITOR WITH DHT11 AND ARDUINO UNO एक R4 WIFI

Circuit Diagram

file.None

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