Tag: Hardware & IoT

All the articles with the tag "Hardware & IoT".

• PixelCompass: A Low-Cost, Web-Configurable Minecraft Compass IRL

  Published: 21 May, 2026 |  at  04:39 AM

  Rebuilding the Minecraft compass in real life (Project: PixelCompass). Hardware is fully open-source. This new iteration downgrades the MCU to the budget-friendly WCH CH592F to drastically cut cost and power consumption, optimizes LED diffusion, and introduces a driverless USB web dashboard for easy configuration. Includes complete bill of materials, assembly guide, and troubleshooting.

• 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.

• 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.

• 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.

• 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.

• ESP32 Development Notes: Async HTTP, GIF Playback, and Resource OTA

  Published: 21 Sep, 2022 |  at  06:45 AM

  Four ESP32 development notes: asynchronous HTTP, keeping PWM active during light sleep, GIF playback, and OTA updates for SPIFFS resources.

• ESP32 LCD Performance: Parallel Interface versus SPI

  Updated: 29 Nov, 2025 |  at  10:46 AM

  Comparing 60 MHz SPI and 8-bit parallel LCD performance on ESP32 using TFT_eSPI and LVGL to examine rendering and bus throughput limits.

• Variable Fonts in LVGL, Part 3: Loading Fonts and Managing Memory on ESP32

  Published: 3 Jan, 2022 |  at  08:40 PM

  Loading variable fonts on ESP32 with FreeType and LVGL, configuring PlatformIO libraries, and managing memory with LV_FREETYPE_SBIT_CACHE.

• Variable Fonts in LVGL, Part 2: Porting FreeType to ESP32

  Published: 19 Dec, 2021 |  at  05:47 AM

  Moving an LVGL variable-font demo from a desktop simulator to ESP32, configuring FreeType, and driving an ST7789 display with dynamic font weights.

• Building the Stack Overflow Three-Key Macro Keyboard with ATmega32U4

  Updated: 19 Dec, 2025 |  at  04:10 AM

  Recreating Stack Overflow's April Fools' three-key macro keyboard with ATmega32U4 USB HID, a KiCad PCB, and Arduino keyboard shortcuts.

• Displaying a Remote JPG Image on ESP32 over HTTP

  Updated: 25 Nov, 2025 |  at  08:07 AM

  Displaying remote JPG images on ESP32 over HTTP, with AsyncTCP chunk handling, Content-Length parsing, and onData callbacks.

• Streaming a PC Screen to an ESP32 Display

  Updated: 27 Nov, 2025 |  at  05:40 PM

  Streaming PC frames to ESP32 using Python MSS capture, OpenCV JPEG encoding, a custom TCP protocol, and TFT_eSPI with DMA display rendering.

• Adding a Light Switch to HomeKit, Part 2: Servo Control and Integration

  Updated: 28 Jun, 2026 |  at  08:50 PM

  Combining an ESP32 HomeKit LED demo with MCPWM servo control to operate a physical light switch through Siri without modifying its wiring.

• Adding a Light Switch to HomeKit, Part 1: The LED Demo

  Published: 11 May, 2020 |  at  01:03 AM

  Setting up ESP32 HomeKit development in Windows WSL, building and flashing esp-homekit-demo, and accessing a serial device through ttyS3.