English · 繁體中文
Year 2 Electrical Engineering at Hanze University of Applied Sciences, Groningen 🇳🇱. Taiwanese. I build embedded hardware and small self-hosted systems, and the part I like most is the fault that does not make sense yet.
| Looking for | An internship in test, verification or measurement, July 2027 – January 2028, in the Netherlands or Taiwan |
| Good at | Fault isolation on real hardware, embedded firmware (ESP32 / ESP8266), KiCad boards from schematic to bring-up, Linux on single-board computers |
| Certificates | VOL-VCA (Dutch supervisor-level safety) · APCS · IELTS 7.0 / C1 |
| Languages | Mandarin (native) · English (C1) · German (A2) |
| Path | 🇹🇼 Taiwan → 🇩🇪 exchange year in Germany '21–'22 → 🇳🇱 Netherlands |
symptom ──> measure ──> kill a hypothesis ──> root cause ──> write-up
^ | |
└── next one ───┘ open items stay marked open
Every repo below follows this loop. When I was wrong, the write-up says where.
| Repo | Symptom | What the measurement showed | Result |
|---|---|---|---|
| rpi4-usb-ssd-resilience | A Pi 4 crashed when the desk was bumped. The logs were empty. | The journal lived on the disk that dropped, so the evidence died with it. Four separate faults, one obvious. | Automatic recovery in 22 seconds. The proof run found three more bugs. |
| basil-growbox | An ESP8266 reset several times an hour while ping answered in 1–2 ms. | Ping is answered below the sketch, so "it responds" proved nothing. Three explanations failed, one of them at 3.29 V measured on the 3V3 rail. | Trigger found: 0 crashes in 23 hours, 3 in 3 minutes with a second API client. The mechanism is still open, and the README says so. |
| ili9341-dead-quarter | A quarter of a 2.8" display never updates. Every on-screen self-test says PASS. | The test reads back the region that it drew. Two builds from one source file on one board isolate the build configuration. | One build is broken, one is correct, same source. |
| hinet-dual-path-probe | Does a static IP lower game ping? | Two ISP account types on one line, measured at the same time on the UDP path a Source 2 game uses. | Median ping is identical. The tail is not: 1 sample in 6 above 60 ms on the dynamic account, 1 in 868 on the fixed one. Data updates hourly. |
| Project | What it is | My part |
|---|---|---|
| smart-pet-door | ThermaPaw: a sealed, motor-driven pet door that cuts HVAC loss. ESP32-C6, TMC2130 stepper, LD2410 radar, ToF. | Year 1 capstone, team lead. Demonstrated live with a real dog. |
| LightController | USB-C PD LED controller PCB V2. CH224K PD sink, AP63205 buck, ESP32-C3. | Schematic, layout, fabrication and bring-up in KiCad. |
| ReactionTimeDuel | Four-player reaction game over ESP-NOW with wireless joysticks. | Selected for the Hanze Open Day. |
| wholeTest | Hardware integration tests for ReactionTimeDuel: display, host MCU and joystick links, before the full build. | Each part is validated alone first. |
| Duco | 868 MHz reverse engineering of a ventilation unit with ESP8266 + CC1101. | Captured the traffic, stopped at rotating keys in the join handshake. Shelved. The negative result is the useful part. |
| CAMtest | Two ESP32-CAMs for stereo vision that aims a spotlight. | Shelved: too fragile in real conditions. |
| lightbar2mqtt | ESP32 / ESP32-C3 bridge from a Xiaomi monitor light bar to Home Assistant. | Fork: added BME280 + SCD41 sensors, a PlatformIO build, OTA, and reliability fixes from weeks of use. |
Home Assistant and UniFi on two sites in two countries, self-hosted with Docker on single-board computers.
| Project | What it is |
|---|---|
| NLDeskCYD · PCDeskCYD | ESP32 touchscreen dashboards for Home Assistant, LVGL 9 + PlatformIO |
| CO2 · Kitchen | CO₂ desk lamp (SCD41, BME280) and an LD2410B presence radar, linked over ESP-NOW, in HomeKit |
| JonsPanel | Native replacement for the JONSBO PC Monitor app; drives USB HID case panels with less CPU and memory |
| mousecal | Measure and correct the rotation angle of a mouse sensor, in the browser |
| id4-tray | Windows tray app for the Audient iD4 MKII: sample rate and ASIO buffer size |
| tourplan · tripcompanion-app | Self-hosted trip tools: a date picker for the least technical relative, and a phone-first trip timeline |
| denba-app | iPad-first PWA for inventory, sales, trials and P&L |
| yt-subtitle-translator | Real-time YouTube subtitle translator (DeepL + Google) |
| room-presence | Which zone of the room a person is in, from WiFi CSI and BLE phone RSSI on ESP32 anchors, fused in Home Assistant. Measurements and open limits included |
| powermon | ESP8266 firmware that counts electricity-meter pulses with a photodiode and publishes watts and kWh over MQTT |
| mpv-adaptive-enhance | mpv setup for Windows that picks, per video, the best picture the GPU can sustain: shaders and frame interpolation |
I use language models as debaters, executors and reviewers, with a check between each step. The harness around the model is the interesting part.
| Project | What it does |
|---|---|
| claude-bridges | MCP bridges that let one agent consult other models for structured, role-based review |
| solver-verified-bench | LLM benchmark where answer keys are data, timeouts count as failures, and the limits are written down |
| claude-memory-web | Browser UI for a self-hosted memory store: no build step, ETag conflict diffs, git history |
| trader · retired 2026-10-10 | Paper-trading bot: a multi-model pipeline behind hard-coded Python safety rails. +7.06% against SPY +12.68% over 6 months, alpha t=0.35. Retired, with the write-up in the repo. |
| DOWTrade | The same idea on futures, measured against a deterministic control arm. Still running; live numbers below. |
Embedded · ESP32 ESP8266 Arduino PlatformIO ESPHome KiCad LVGL RF 868MHz ESP-NOW MQTT
Software · C/C++ Python JavaScript C# Flask FastAPI Docker HomeKit
Design and infrastructure · Fusion 360 3D Printing Home Assistant UniFi Cloudflare Raspberry Pi
DOWTrade publishes its own numbers below; trader is retired and shown at its final snapshot. A cron job on the Pi rewrites this block on a schedule, so it shows whatever the last run produced.
Live Stats · updated 2026-11-13 17:15 ET · auto-generated by RPi cron
Trader (Alpaca Paper)
Retired 2026-10-10 — finalDOWTrade (MYM Sim) Equity $107,064.60 $999,262.32 Return +7.06% (SPY +12.68%) -2.95% Net P&L — $-737.68 Positions 24 (frozen, not liquidated) FLAT Day P&L — — Total Trades — 142 DOWTrade returns are quoted against $25,000 of risk capital, not the sim account's $1M broker fallback — the strategy risks $250 a trade, so a percentage of a million is meaningless. Control arm: identical 15m bars, identical 2xATR stop and sizing, with the LLM ensemble replaced by a plain EMA(9/21) cross -> $-3,759.65 over 275 trades (26.2% win rate, -0.035R avg). Re-pricing the LLM version under the same cost model (one tick of adverse slippage per fill plus commission) gives $-1,262.68 over 148 round trips. The Net P&L row above is as-booked and predates that cost model, which applies to positions opened from 2026-09-09. Neither sample is remotely large enough to be significant. This is a direction, not a result.
Nearly all of it self-hosted on a single-board computer — because why pay for cloud when a $35 machine will do.