The latest articles on Forem by Octablock (@choihimchan). https://forem.com/choihimchan https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3757145%2F6f5fad03-df42-43ff-bbde-00555eb94c90.png https://forem.com/choihimchan en Octablock Sat, 07 Feb 2026 21:27:26 +0000 https://forem.com/choihimchan/i-built-a-high-speed-uart-analyzer-using-esp32-s3-1961 https://forem.com/choihimchan/i-built-a-high-speed-uart-analyzer-using-esp32-s3-1961 <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0q409unuwv0f6rpakmiq.gif" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0q409unuwv0f6rpakmiq.gif" alt=" " width="600" height="337"></a></p> <p>Hi everyone,</p> <p>I built a high-speed UART analyzer using an ESP32-S3 and a PC GUI.</p> <p>The goal was to easily monitor UART traffic from any MCU without modifying firmware.</p> <p>You just connect TX → ESP32 RX and monitor everything on PC.</p> <p>No logic analyzer needed.</p> <h2> Features </h2> <ul> <li>Up to 921600 baud capture</li> <li>Real-time throughput graph</li> <li>RAW hex viewer</li> <li>Auto frame decoding</li> <li>Health / buffer monitoring</li> <li>Windows standalone EXE</li> </ul> <h2> Hardware Connection </h2> <p>Target TX → ESP32-S3 GPIO18<br><br> Target GND → ESP32-S3 GND (IMPORTANT)</p> <h2> Usage </h2> <ol> <li>Flash firmware to ESP32-S3</li> <li>Connect TX and GND</li> <li>Run Windows EXE</li> <li>Select COM port</li> <li>Press Start</li> </ol> <h2> GitHub </h2> <p><a href="https://github.com/choihimchan/linkscope-bpu-uart-analyzer" rel="noopener noreferrer">https://github.com/choihimchan/linkscope-bpu-uart-analyzer</a></p> <p>I’d love feedback and suggestions.</p> <p>If you’re interested in collaborating, feel free to comment.</p> <p>Thanks!</p> <h1> esp32 </h1> <h1> embedded </h1> <h1> python </h1> <h1> iot </h1> <h1> opensource </h1> iot showdev sideprojects tooling