How to Send Data from STM32 to Your PC | UART Tutorial

Learn how to send data from an STM32 to your PC using UART and STM32CubeIDE! In this beginner-friendly tutorial, we'll configure USART2 on the NUCLEO-F446RE, transmit our first Hello World message, and send changing data using a button-press counter. UART (Universal Asynchronous Receiver/Transmitter) is one of the most useful communication interfaces in embedded systems. Whether you're working with microcontrollers, sensors, robotics, or other embedded devices, understanding UART is an important skill. In this tutorial, we'll cover: How UART works, including asynchronous and full-duplex communication Baud rates, TX/RX lines, and 8N1 data framing Configuring USART2 in STM32CubeMX Using the onboard ST-LINK virtual COM port Transmitting messages with HAL_UART_Transmit() Understanding message buffers, transmission lengths, and timeouts Using snprintf() to transmit changing variables Building a button-press counter and displaying the results in a serial terminal I'm using the STM32 NUCLEO-F446RE development board, but the same fundamentals apply to many other STM32 microcontrollers. This tutorial is also part of my autonomous underwater vehicle (AUV) project. Eventually, I'll use communication between my STM32 and NVIDIA Jetson Orin Nano to exchange sensor information and system commands. Today, we're starting with UART transmission from the STM32 to a PC. In the next tutorial, we'll explore receiving UART data and using incoming information in our microcontroller. CHAPTERS 00:00 Why I Need UART for My AUV 00:28 What Is UART? Asynchronous Communication and 8N1 01:52 STM32 Hardware: USART2 and ST-LINK 03:02 Configuring UART in STM32CubeMX 04:48 Writing Our First UART Transmission 06:46 Flashing the STM32 and Sending Hello World 07:35 Transmitting Dynamic Data with a Button Counter 10:23 Testing the Button Counter 10:49 Recap and Next Steps: UART Reception RESOURCES: STM32 Tutorial Playlist ➡️    • How to Blink an LED on STM32 | NUCLEO-F446...   Previous STM32 Button Tutorial ➡️    • STM32 Nucleo F446RE Tutorial for Beginners...   If you're learning embedded systems or building your own engineering projects, consider subscribing! I'm documenting what I learn through STM32 tutorials, electronics, robotics, and the development of my autonomous underwater vehicle. Have a question or trouble getting UART to work? Leave a comment below. #STM32 #UART #STM32CubeIDE