Project Hub /IoT & Connected Devices/Environmental & Weather Monitoring/Interfacing DHT11 Temperature & Humidity Sensor with STM32F103C8

Intermediate

STM32

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

Interfacing DHT11 Temperature & Humidity Sensor with STM32F103C8

Learn how to interface the DHT11 temperature and humidity sensor with an STM32F103C8 (Blue Pill) microcontroller and display the readings on an I2C 16x2 LCD.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

DHT11 Temperature and Humidity Sensor Module for Arduino Raspberry Pi Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Cable for Arduino Nano (USB 2.0 A to USB 2.0 Mini B) 30cm Rs. 69.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: LCD (generic / unspecified)
STM32 Board
IIC

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How It Works

This project creates an environmental monitoring system using an STM32F103C8 microcontroller, commonly known as the Blue Pill board. At the heart of the system is the DHT11 sensor, which utilizes a capacitive humidity sensor and a thermistor to measure the surrounding air, converting these physical properties into digital signals. The STM32 microcontroller communicates with the DHT11 using a specialized single-wire protocol to request and retrieve the raw temperature and humidity data. Once the microcontroller processes these values, it formats the data for visual output. Instead of using numerous individual data pins, the 16x2 LCD display is connected via an IIC/I2C serial interface adapter module. This I2C adapter uses only two data lines (SCL and SDA) to communicate with the STM32, drastically simplifying the wiring harness on the breadboard. The entire system is powered via a standard USB cable connected to the Blue Pill board, which also serves as the programming interface when developing the software in the Arduino IDE using the required sensor and display libraries.

Why Build This

Gain practical experience integrating digital environmental sensors with 32-bit ARM Cortex-M microcontrollers for undergraduate engineering applications.

Learn how to implement serial communication protocols like I2C to control peripheral display hardware with minimal wiring.

Develop foundational firmware skills using the Arduino IDE environment adapted for STM32 hardware platforms.

Real-World Application

Environmental monitoring systems, smart home climate control, agricultural greenhouses, and weather stations.

Skills You'll Learn

ARM Cortex-M microcontroller programming

I2C serial communication

single-wire sensor interfacing

LCD display management

embedded firmware development

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

STM32

DHT11

I2C

16X2 LCD

ARDUINO IDE

SENSORS

C++

Frequently Asked Questions

Why do I need to install a special board package in the Arduino IDE for this project?

The Arduino IDE natively supports standard AVR-based boards like the Uno. To program the STM32F103C8 Blue Pill, you must install the STM32 board package so the compiler knows how to translate your code into instructions for the ARM Cortex-M architecture.

What is the purpose of the I2C adapter module attached to the 16x2 LCD?

The I2C adapter reduces the number of required microcontroller pins from six or more down to just two (SDA and SCL), making the breadboard layout much cleaner and easier to wire.

Can I power the STM32 Blue Pill directly from a computer USB port?

Yes, the USB cable supplies the necessary 5V power to the board, which is then regulated down to the 3.3V logic level required by the STM32F103C8 microcontroller.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

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