Build Instructions

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• 1

  Step 1: Circuit Diagram & Wiring

  Connect your components according to the table below:

  • DHT 11 Signal to Arduino Pin D2
  • DHT 11 GND to Arduino's GND Pin
  • DHT 11 VCC to Arduino's 3.3v Pin

  
  

  • OLED VCC to Arduino's 5v Pin
  • OLED GND to Arduino's GND Pin
  • OLED SCL to Arduino's SCL Pin
  • OLED SDA to Arduino's SDA Pin

  Tip: Ensure your OLED I2C address is set to 0x3c. You can use an I2C scanner sketch if unsure.

• 2

  Step 2: Installing Libraries

  To make your project run smoothly, open your Arduino IDE and install these libraries:

  1. Adafruit SSD1306
  2. Adafruit GFX Library
  3. DHT Sensor Library

  Install them via:

  Sketch -> Include Library -> Manage Libraries...

  Sketch -> Include Library -> Manage Libraries...

  Then search each one by name and click Install.

• 3

  Step 3: Upload the Code

  Now It's time to program your Arduino.

  here's the full, ready-to-upload code:

  #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <DHT.h> // ==== OLED SETTINGS ==== #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 #define OLED_ADDR 0x3C Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // ==== DHT SETTINGS ==== #define DHTPIN 2 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(115200); delay(1000); Serial.println("Initializing DHT11 + SSD1306 OLED..."); if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) { Serial.println("❌ SSD1306 not found! Check wiring or I2C address."); while (1); } display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setTextSize(1); display.setCursor(20, 25); display.println("Initializing..."); display.display(); dht.begin(); delay(2000); } void loop() { delay(2000); float humidity = dht.readHumidity(); float temperature = dht.readTemperature(); if (isnan(humidity) || isnan(temperature)) { Serial.println("⚠️ Failed to read from DHT11 sensor!"); display.clearDisplay(); display.setTextSize(1); display.setCursor(25, 25); display.println("Sensor Error!"); display.display(); return; } int tempInt = (int)temperature; int humInt = (int)humidity; Serial.print("Temperature: "); Serial.print(tempInt); Serial.print(" °C | Humidity: "); Serial.print(humInt); Serial.println(" %"); display.clearDisplay(); display.setTextSize(1); display.setCursor(35, 0); display.println("DHT11 DATA"); display.setTextSize(1); display.setCursor(0, 20); display.print("Temp: "); display.print(tempInt); display.println(" C"); display.setCursor(0, 40); display.print("Hum : "); display.print(humInt); display.println(" %"); display.display(); }

  Once uploaded, open the Serial Monitor (115200 baud) to view live readings.

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