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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Environmental Sensing

Components and supplies

SmartElex Bharat AI Innovators Kit Powered by Arduino

Apps and platforms

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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