Case studies and project archives for embedded hardware, firmware, control systems, robotics, and internship evidence.这里会持续整理项目背景、工程过程、技术栈、实验记录和可验证成果。
A small single-channel electromagnetic-lock power board record, centered on the ESP32-S3 control direction, power-stage choices, and the files needed to read the board back later.单路电磁锁电源管理板的小型记录，重点放在 ESP32-S3 控制方向、电源级选择，以及以后能重新读懂这块板的文件。
A Juanyun thermal-management work record around ACUnit board splitting, STM32 firmware timing, small sensor and actuator boards, the DIY cooling prototype, and the hardware SOP I wrote during the internship.卷云科技热管理方向的工作记录，围绕外机板拆分、STM32 固件节拍、小传感器/执行器板、DIY 散热原型，以及实习期间写下的硬件 SOP。
A sensorless PMSM FOC driver-board record around STM32F4 and DRV8301, keeping the board files visible while marking the missing bring-up and tuning evidence plainly.围绕 STM32F4 与 DRV8301 的无感 PMSM FOC 驱动板记录，保留板卡文件，也把还缺的上电、起转和调参证据说清楚。
A Nanjing Turing internship record around getting Seamly2D running, adding a small account-management layer, studying CMake/build logic, and packaging Qt releases on Windows and macOS.南京图灵实习记录：跑通 Seamly2D，补一个轻量账号管理层，学习 CMake/编译逻辑，并摸索 Windows 与 macOS 上的 Qt Release 打包。
A first embedded-internship trail around STM32F103C8T6: Keil, ST-Link, GPIO, EXTI, timers, PWM, ADC, UART, sensors, and a small metro-environment monitoring demo.第一次嵌入式实习留下的 STM32F103C8T6 学习路线：Keil、ST-Link、GPIO、中断、定时器、PWM、ADC、串口、传感器和一个地铁环境监测小综合。
An early pressure-flow cooling prototype that moved through 3D printed air ducts, fan control, ESP32 PWM, PCB output, and a small Windows desktop demo.早期压风式散热器原型，从 3D 打印风道、风扇控制、ESP32 PWM、PCB 输出一路摸到一个 Windows 桌面端演示。
A sophomore-year MEC104 breadboard build around Arduino Nano, SN54LS47 decoder chips, two seven-segment displays, BCD digit splitting, and pause/reset switch logic.大二 MEC104 工程实训里的面包板小项目：Arduino Nano、SN54LS47 译码芯片、两位七段数码管、BCD 拆位显示，以及暂停/复位开关逻辑。
A sophomore-year MEC104 smart-car kit project around through-hole/SMD soldering, Arduino Nano firmware, IR line sensors, collision switches, L293 motor driving, and race-track tuning.大二 MEC104 工程实训里的智能小车套件项目：从插件/贴片焊接、电源和主控电路理解，到 Arduino Nano 固件、红外循迹、碰撞开关、L293 电机驱动和赛道调参。