Engineering notes工程笔记

Trace hardware, firmware, and control questions through failures, source files, board bring-up, and verification.沿着故障、源文件、板级调试与验证，追踪硬件、固件和控制问题。

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  1. Claude Chime Power BoardClaude Chime 电源板Protected Battery Startup Measurements带保护电池的启动测量Separating cell and pack voltage, capacitor charging and protection timing when investigating a failed cold start.从一次冷启动掉压出发，研究电芯与电池包输出的区别、电容充电，以及保护判断所需的测量。BatteryInrush CurrentBoost Converter+1
  2. Claude Chime Power BoardClaude Chime 电源板A Switched Battery Divider and ADC Settling电池采样开关与 ADC 建立时间Calculating the settling, current consumption and error sources of the Claude Chime battery-voltage divider.从 Claude Chime 的受控分压电路出发，计算建立时间、采样耗电与电压换算误差。ADCBatteryRC Filter+1
  3. Custom Driver Board and Sensorless FOC自制驱动板与无感 FOC 实践Angle Continuity in Sensorless FOC Handoff无感 FOC 接管时的角度连续性Separating speed agreement, angle offset and controller-state continuity when moving from open-loop operation to an observer.把速度接近、角度偏差和控制器状态连续性分开，研究开环切换到观测器时应检查什么。FOCObserverEKF+1
  4. Custom Driver Board and Sensorless FOC自制驱动板与无感 FOC 实践Current Sampling Within a PWM CyclePWM 周期内的电流采样Following the actual shunts, analog filtering and four-rank injected ADC sequence on the STM32F446 FOC board.沿实际分流电阻、模拟滤波与四通道注入序列，研究 FOC 电流采样是否处在合适的时刻。FOCADCPWM+1
  5. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统Cooperative Task Timing on the ACUnitACUnit 的协作式任务时序Examining execution time, deferred sensor reads and missed deadlines in a bare-metal EEV controller.沿 ACUnit 的阀步进与慢速传感器读取，研究执行耗时、任务推迟与错过节拍后的处理。STM32SchedulingEEV+1
  6. DIY Laptop CoolerDIY 压风式笔记本散热器Temperature Sampling and Fan Response温度采样与风扇响应Following sensor selection, asynchronous reading and sending, and peak resets to understand when a temperature sample changes fan output.沿传感器选择、异步读取与发送、温度峰值清空，研究一条温度样本何时影响风扇输出。ESP32C#Temperature Sampling+2
  7. DIY Laptop CoolerDIY 压风式笔记本散热器PWM Fan Control and Speed FeedbackPWM 风扇控制与转速反馈Studying fan power and PWM connections, waveform frequency and duty, and separate tachometer feedback for measuring each fan’s response.从风扇供电与 PWM 接线，研究频率、占空比和独立测速反馈，理解怎样观察每只风扇的实际响应。ESP32PWMFan Control+2
  8. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统Flash Parameter Saving and RecoveryFlash 参数保存与恢复Studying delayed writes, committed records and page turnover using the BaseUnit fan setting.从 BaseUnit 的风扇设定值出发，研究延迟写入、记录提交与双页切换时的恢复顺序。STM32FlashPersistence+1
  9. Tianjin Jintie STM32 Internship天津津铁 STM32 嵌入式实习I²C Communication and OLED DebuggingI²C 通信与 OLED 调试Studying pull-ups, transfer timing and acknowledgment, then comparing software and peripheral I²C when troubleshooting an OLED.从上拉、电平、地址与应答，研究软件和硬件 I²C 的区别，以及 OLED 不显示时怎样定位问题。STM32I2COLED+2
  10. Tianjin Jintie STM32 Internship天津津铁 STM32 嵌入式实习Light Calibration and Lookup Control光照标定与查表控制Working through an ADC-to-PWM interpolation example, uneven calibration intervals and a possible correction for changing ambient light.从目标 ADC 到 PWM 的一次插值计算，研究采样点分布、标定条件和环境光变化后的修正思路。STM32ADCPWM+2
  11. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习Local Account Permission Rules本地账户的权限判断Separating actor, target and action in Seamly2D role management, then checking state changes and persistence.从 Seamly2D 的本地角色管理出发，拆开操作者、目标账户与操作，再检查状态变化和保存结果。QtState MachineAuthorization+1
  12. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习Qt Windows Runtime DependenciesQt 程序的 Windows 运行依赖Tracing a packaged Qt application through DLL loading, platform plugins and a clean-machine check.从缺少 DLL 的报错出发，研究 Qt 程序的动态依赖、平台插件与换机验证。QtWindowsDeployment+1
  13. Arduino Breadboard Two-Digit Seven-Segment CounterArduino 面包板两位数码管计数器Latching Switches and Counter Control自锁按键与计数控制Studying latching contacts, input bias, debouncing, state changes, and elapsed-time counting to define predictable pause and reset behaviour.从自锁触点和输入上下拉，研究消抖、状态变化与计数时序，理清暂停和复位怎样按预期响应。ArduinoSwitchesDebounce+2
  14. Arduino Breadboard Two-Digit Seven-Segment CounterArduino 面包板两位数码管计数器Common-Anode Displays and BCD Decoding共阳数码管与 BCD 译码Following decimal digit splitting and BCD bit order into active-low LS47 outputs, common-anode LED current paths, segment resistors, and display controls.沿十进制拆位与 BCD 位序，理解 LS47 低有效输出、共阳 LED 电流路径、逐段限流和显示控制。ArduinoBCDSeven-Segment Display+1
  15. Arduino Smart Car Line-Tracking KitArduino 循迹小车焊接与控制实训Arduino Car Line Sensing and Input AcquisitionArduino 小车的循迹信号与输入采集Tracing reflected infrared light through the sensor circuit, 74HC165 input thresholds, parallel loading, serial read order, and the code's mapping from bits to sensor positions.从黑线与悬空会触发同一判断的注释出发，沿反射光、电压、电平门限与 74HC165 读取时序，理解每个比特怎样对应车底的传感器。ArduinoInfrared Sensing74HC165+1
  16. Arduino Smart Car Line-Tracking KitArduino 循迹小车焊接与控制实训Arduino Car Power and Wheel-Speed MeasurementArduino 小车的供电与轮速测量Following the car’s battery and logic rails through L293D drive and PWM, then deriving wheel rpm from optical marks, interrupt timing, and the course library’s feedback routine.沿电池与逻辑电源追到 L293D 和 PWM，再从轮子标记、中断计时推导 rpm，读懂课程电机库里的反馈调速。ArduinoPower SupplyPWM+2
  17. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统ACUnit Automatic Refrigeration Control and Protection LogicACUnit 自动制冷控制与保护逻辑The later ACUnit firmware moved EEV and compressor decisions onto a portable board-side control core with STOP, QUIET, PERF, and ZERO modes, while keeping sensor validity, superheat, pressure, and startup protection above the temperature target.后期 ACUnit 固件把 EEV 与压缩机决策移到可移植的板端控制核心，形成 STOP、QUIET、PERF、ZERO 模式，并让传感有效性、过热度、压力与启动保护始终优先于温度目标。STM32ControlEEV+3
  18. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统Comparing ACUnit V2.0 and V2.1 System DiagramsACUnit V2.0 与 V2.1 系统框图对比A comparison of the V2.0 routed block diagram and V2.1 interface mind map, limited to visible connections, labels, and unanswered revision questions.比较 V2.0 连线框图与 V2.1 接口思维图，只讨论可见连接、标签，以及两张图没有回答的版本问题。PCBRevisionManufacturing+1
  19. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统DHT11 and AM2302 Pinouts and Interface RequirementsDHT11 与 AM2302 的引脚定义与接口要求An archived DHT board plan and the AM2302 manual expose a GND/NC conflict that must be resolved before approving a footprint or claiming verification.对读归档 DHT 小板计划与 AM2302 原厂手册，发现一处 GND / NC 冲突；批准封装或声称完成验证前，必须先解决这处冲突。SensorPCBDHT11+1
  20. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统Hardware Development SOP硬件开发 SOP 整理The Juanyun hardware-development SOP I wrote during the internship, kept as readable webpage text with the original PDF linked at the end.实习期间写下的卷云硬件开发 SOP，以网页正文保留阅读，也在文末保留原 PDF 链接。SOPHardwareDocumentation
  21. Cirro Phase-Change Cooling Controllers卷云相变散热器控制系统ULN2003A Electronic Expansion Valve Drive and Step ControlULN2003A 电子膨胀阀驱动与步进控制An archive reading of the EEV driver board, ULN2003A schematic, STM32F103 phase mapping, blocking valve routines, and the thinner BLDC file trail.沿 EEV 驱动小板、ULN2003A 原理图、STM32F103 相线映射与阻塞式阀控制函数阅读一组历史归档，并标出较薄的 BLDC 文件线索。ActuatorBLDCSTM32+1
  22. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习Release Packaging Across Windows And macOSWindows 与 macOS Release 打包记录The original Seamly2D release packaging Markdown rendered as a full webpage note, covering Windows dependency collection, signing, Inno Setup, and follow-up packaging checks.把 Seamly2D Release 打包发布流程的原始 Markdown 直接渲染成完整网页笔记，覆盖 Windows 依赖收集、签名、Inno Setup 和后续验证。QtReleasewindeployqt+2
  23. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习sm2d XML Sample Reading Notessm2d XML 样例文件观察笔记The original README note around the Seamly2D sample folder plus the full public .sm2d and .smis XML samples rendered on the note page.把 Seamly2D 样例文件夹 README 里的原话，以及公开 .sm2d / .smis XML 样例全文直接放到笔记页。Seamly2DXMLData Format+1
  24. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习CMake And Build Logic Learning NotesCMake 与编译底层逻辑学习笔记Two Notion-exported source notes rendered directly as the CMake/build-logic note: one CMake primer and one Qt-oriented compiler/toolchain map.把两份 Notion 导出的原始笔记直接渲染成 CMake / 编译底层逻辑笔记：一份 CMake 入门，一份 Qt 学习导向的编译器与工具链地图。CMakeCompilerNinja+1
  25. Seamly2D Qt Development Internship南京图灵 Seamly2D 开发实习Qt6 Seamly2D First Run NotesQt6 环境跑通 Seamly2D 的记录The original Windows 11 Qt6 Seamly2D onboarding text rendered directly as a webpage note, with the raw TXT/DOCX kept as source links.把 Windows 11 下 Qt6 跑通 Seamly2D 的原始记录直接渲染成网页笔记，并保留 TXT / DOCX 源文件链接。QtSeamly2DMSVC+1