Published May 9, 2025

Real-Time Weather Station using using Arduino (UNO) EK Wi-Fi

Create a real time temperature and humidity display using Arduino Ek WIfi, DHT 11 and OLED -- simple, compact, and beginner-friendly

IntermediateFull instructions provided1 hour327

Real-Time Weather Station using using Arduino (UNO) EK Wi-Fi

Things used in this project

Hardware components

Arduino UNO R4 WiFi

DHT11 Temperature & Humidity Sensor (3 pins)

Jumper wires (generic)

0.96 OLED

Software apps and online services

Arduino IDE

Story

Introduction

Welcome to one of the simplest yet highly practical IoT projects -- a real-time weather station using Arduino (UNO)Ek Wi-Fi (Made in India), a DHT11 temperature & humidity sensor, and a compact OLED 128x64 display. Whether you're a beginner stepping into the world of microcontrollers or just want a neat project for your desk or room, this project is ideal for you.

Objective

Build a weather monitoring system that reads temperature and humidity from the DHT11 sensor and displays the data on a OLED screen in real time

Inspiration & Story

While tinkering with basic sensors, I wanted to create a minimal yet functional device that combines multiple components. I figured that instead of using big screens or Wi-Fi dashboards, a small OLED could elegantly show environmental data. And that's where the idea for this was born. Powered by Arduino UNO Ek R4 Wi-Fi, this board gives the flexibility to later expand the project into an IoT solution -- maybe even pushing data to the cloud!

Components Required

ArduinoUNOEkR4Wi-Fi x1
DHT11Sensor x1
OLEDDisplay(128x64I2C) x1
JumperWires as needed
Breadboard x1

Wiring Connection

DHT 11 To Arduino Board

VCC To 5v
GND To GND
Data To D7

OLED To Arduino Board

VCC To 5v
GND To GND
SDA to A4
SCL to A5

Code Breakdown

The code initializes the DHT11 and OLED displays, prints a couple of intro screens and then starts reading data from the sensor every 2 seconds. it prints the readings on both the serial monitor and the OLED display

KeyFeatures:

Uses Adafruit_SSD1306 and Adafruit_GFX libraries
Displays Temperature (°C) and Humidity (%) in large font
Shows startup messages ("DHT READING", "ROHAN BARNWAL")
Fully customizable

Applications

Room or desk climate monitor
Embedded IoT dashboard
Educational mini-projects
Weather Logging station with future upgrades

Video Demonstration

Watch this quick demo under 30 seconds how the OLED displays the sensor reading in action

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Conclusion

This project is a classic mix of hardware simplicity and display creativity. With just 3 major components DHT11, OLED and Arduino Ek Wi-Fi -- you've got yourself a real-time, beautifully displayed personal weather station. Perfect for beginners

Code

Code

//Made by Rohan Barnwal 
//www.youtube.com/ArduinoBoy

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

// OLED display size
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// I2C OLED
#define OLED_RESET     -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DHT sensor setup
#define DHTPIN 7         // DHT sensor connected to digital pin D7
#define DHTTYPE DHT11    // Use DHT22 if needed
DHT dht(DHTPIN, DHTTYPE);

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

  // Initialize OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    while (true);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);

  // Step 1: Show "DHT READING"
  display.setCursor(0, 20);
  display.println("DHT READING");
  display.display();
  delay(2000); // Wait 2 seconds

  // Step 2: Clear and show "ROHAN BARNWAL"
  display.clearDisplay();
  display.setCursor(0, 20);
  display.println("ROHAN BARNWAL");
  display.display();
  delay(2000); // Wait 2 seconds

  // Start DHT
  dht.begin();
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print("Temp: ");
  Serial.print(temperature);
  Serial.print("°C  Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  display.clearDisplay();
  display.setTextSize(2);

  display.setCursor(0, 0);
  display.print("Temp: ");
  display.print(temperature, 1);
  display.println(" C");

  display.setCursor(0, 32);
  display.print("Hum: ");
  display.print(humidity, 1);
  display.println(" %");

  display.display();
  delay(2000);
}

Credits

Rohan Barnwal

31 projects • 35 followers

Rohan Barnwal - maker, hacker, tech enthusiast. I explore new tech & find innovative solutions. See my projects on hackster.io!

Real-Time Weather Station using using Arduino (UNO) EK Wi-Fi

Things used in this project

Hardware components

Software apps and online services

Story

Introduction

Objective

Inspiration & Story

Components Required

Wiring Connection

Code Breakdown

Applications

Video Demonstration

Schematics

Connections

Code

Code

Credits

Rohan Barnwal

Comments

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Real-Time Weather Station using using Arduino (UNO) EK Wi-Fi

Real-Time Weather Station using using Arduino (UNO) EK Wi-Fi

Things used in this project

Hardware components

Software apps and online services

Story

Introduction

Objective

Inspiration & Story

Components Required

Wiring Connection

Code Breakdown

Applications

Video Demonstration

Schematics

Connections

Code

Code

Credits

Rohan Barnwal

Comments

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