DHT11 Sensor With SSD1306 OLED | DHT11 with Arduino

DHT11 Sensor With SSD1306 OLED | DHT11 with Arduino

DHT11 with Arduino Working

Display Temperature & Humidity on OLED Using DHT11 and Arduino

Monitoring temperature and humidity is important for many DIY electronics and IoT projects. Whether you're building a smart greenhouse, weather station, or room climate monitor, the DHT11 sensor is a simple and affordable solution. In this article, we’ll show you how to use the DHT11 sensor with an SSD1306 OLED display and an Arduino to visually display real-time environmental data.

What is the DHT11 Sensor?

The DHT11 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and provides the data via a digital signal. While it's not the most accurate sensor available, it is sufficient for small hobby projects.

Features of DHT11:

Temperature range: 0–50°C

• Temperature range: 0–50°C

Humidity range: 20–90% RH

• Humidity range: 20–90% RH

Accuracy: ±2°C and ±5% RH

• Accuracy: ±2°C and ±5% RH

Operating voltage: 3.3V to 5V

• Operating voltage: 3.3V to 5V

What is the SSD1306 OLED Display?

The SSD1306 is a monochrome OLED display module with a resolution of 128x64 pixels. It communicates via I²C, which requires only two pins (SDA and SCL), making it perfect for small Arduino projects with limited I/O pins.

Features of SSD1306 OLED:

0.96-inch screen

• 0.96-inch screen

I²C interface (SDA, SCL)

• I²C interface (SDA, SCL)

Low power consumption

• Low power consumption

Clear, sharp text and graphics display

• Clear, sharp text and graphics display

Components Required

To complete this project, you’ll need:

Arduino UNO (or compatible board)

• Arduino UNO (or compatible board)

DHT11 temperature & humidity sensor

• DHT11 temperature & humidity sensor

SSD1306 OLED display (0.96", I²C)

• SSD1306 OLED display (0.96", I²C)

Jumper wires

• Jumper wires

Breadboard

• Breadboard

USB cable for programming

• USB cable for programming

Circuit Connections

Connect the components as follows:

DHT11 Sensor:

VCC → 5V

• VCC → 5V

GND → GND

• GND → GND

DATA → Digital Pin 2

• DATA → Digital Pin 2
• DHT11 Sensor:VCC → 5VGND → GNDDATA → Digital Pin 2

SSD1306 OLED:

VCC → 3.3V or 5V (depending on module)

• VCC → 3.3V or 5V (depending on module)

GND → GND

• GND → GND

SDA → A4 (on UNO)

• SDA → A4 (on UNO)

SCL → A5 (on UNO)

• SCL → A5 (on UNO)
• SSD1306 OLED:VCC → 3.3V or 5V (depending on module)GND → GNDSDA → A4 (on UNO)SCL → A5 (on UNO)

Arduino Code Overview

To make the project work, you’ll need to install two Arduino libraries:

Adafruit_SSD1306 (for OLED display)

• Adafruit_SSD1306 (for OLED display)

DHT sensor library by Adafruit (for DHT11)

• DHT sensor library by Adafruit (for DHT11)

The code initializes both the sensor and the display, continuously reads the temperature and humidity, and displays the values on the OLED screen. The data updates every second, providing real-time environmental readings.

The OLED screen is divided into sections to clearly show:

Temperature (in °C)

• Temperature (in °C)

Humidity (in %)

• Humidity (in %)

Applications

This project is ideal for:

Home climate monitoring

• Home climate monitoring

Smart agriculture

• Smart agriculture

Indoor air quality systems

• Indoor air quality systems

DIY weather stations

• DIY weather stations

IoT-based monitoring systems

• IoT-based monitoring systems

Conclusion

Using a DHT11 sensor with an SSD1306 OLED and Arduino is an excellent way to start building simple and useful environment monitoring devices. The sensor offers basic accuracy, while the OLED gives your project a polished, user-friendly look. This setup is easy to build, affordable, and flexible enough to be expanded into more advanced IoT applications.