Posts

All the articles I've posted.

• Embedding Files in ESP-IDF Firmware with embed_txtfiles

  Published: 4 Jan, 2026 |  at  08:12 PM

  How ESP-IDF's EMBED_TXTFILES works, including CMake resource embedding, read-only flash data, linker symbols, and TLS certificate handling.

• Ditherpunk, Part 2: Image Dithering on an ESP32 Monochrome Display

  Published: 30 Dec, 2025 |  at  09:38 PM

  Porting dithering algorithms to an ESP32 monochrome display, with gamma lookup tables, an ST7305 driver, and Bayer, Atkinson, and blue-noise comparisons.

• Ditherpunk, Part 1: Dithering Algorithms and Interactive JavaScript Demos

  Updated: 3 Oct, 2026 |  at  03:40 AM

  Compare Bayer, Floyd-Steinberg and Atkinson dithering in your browser, toggle linear luminance, and download black/white PNGs. Images stay on your device.

• Connecting an ESP32 to a 4G Modem with PPPoS

  Updated: 3 Oct, 2026 |  at  03:40 AM

  Connecting ESP32-C3 and Air780EG through ESP-IDF PPPoS: UART wiring, esp_modem setup, IP events, and troubleshooting power, flow control and APN.

• Driving WS2812 LEDs with SPI and DMA on CH592F and CH582

  Published: 1 Dec, 2025 |  at  07:20 PM

  Driving WS2812 LEDs with SPI and DMA on CH592F and CH582, using four-bit expansion and GRB encoding to avoid blocking the CPU during BLE operation.

• Fixing Duplicate Pages and Canonical URLs in Google Search Console for a Hexo Blog

  Published: 21 Nov, 2025 |  at  09:27 PM

  Fixing duplicate-page and canonical URL problems in Google Search Console for a Hexo blog using 301 redirects, robots.txt, and configuration changes.

• Trying Claude Code for Android Development

  Published: 17 Nov, 2025 |  at  07:39 AM

  Trying Claude Code on an Android serial monitor project, from API and CLI setup to letting the coding assistant implement a feature on its own.

• Building a CS2-Inspired Health Badge with CH592F and GSI Integration

  Updated: 21 Nov, 2025 |  at  02:45 AM

  Building a CS2-inspired electronic health badge with WCH CH592F, BLE HID, and GSI, covering PCB design, power management, and a custom device script.

• Publishing on Google Play as an Independent Developer: My 2025 Experience

  Updated: 3 Oct, 2026 |  at  03:40 AM

  My 2025 Google Play release: $25 registration, a 12-tester closed test lasting 14 days, production access, and Firebase / AdMob privacy disclosures.

• Modifying GLSurfaceView for Zero-Copy Texture Sharing between Views

  Published: 11 Apr, 2025 |  at  05:10 AM

  Forking AOSP's GLSurfaceView into GL14SurfaceView to share GPU textures between EGL14 contexts and render to multiple views without CPU copies.

• Driving a WS2812 RGB LED over SPI on the DWM3001CDK

  Published: 12 Jan, 2025 |  at  11:05 PM

  Driving a WS2812 RGB LED over SPI using the nRF52833 on a DWM3001CDK development board.

• Minecraft Compass IRL: Building and Using MCompass

  Published: 14 Dec, 2024 |  at  08:00 AM

  Building and using MCompass, an ESP32-C3 and GPS-based Minecraft compass with lodestone targeting, overshoot animation, firmware setup, and a bill of materials.

• Friday Ink: Is It Friday Yet?

  Updated: 29 Nov, 2025 |  at  07:16 PM

  Building Friday Ink, a CH582F e-paper clock with approximately 3μA sleep current, including display drivers, Rust firmware, and power switching.

• Adding a Xiaomi Yeelight Monitor Light Bar to HomeKit with an ESP32-C3 Controller

  Updated: 29 Nov, 2025 |  at  06:42 PM

  Adding a Xiaomi Yeelight monitor light bar to HomeKit by building an ESP32-C3 replacement controller, with teardown and pin measurements.

• Why Declarative UI Uses Explicit Lifecycle Subscriptions Instead of onResume

  Published: 2 Jan, 2024 |  at  08:01 AM

  Why declarative UI frameworks use explicit lifecycle subscriptions instead of component-level onResume, with examples from Flutter and Compose.

• Mapping and Modifying the Lenovo R720 Keyboard Matrix

  Published: 14 Nov, 2022 |  at  04:00 AM

  Mapping a Lenovo R720 laptop keyboard matrix and adapting it with Raspberry Pi Pico, QMK, and a 74HC165 I/O expander for a KVM project.