published: August 10, 2016 —
last modified: October 23, 2025
I published a new application to create “Micro Disk” images for embedded projects with very limited resources. This format fits perfectly on SD cards and it can be read with minimal effort.
The application is available as binary for macOS and Windows. The sources are available on GitHub which can be easily compiled for Linux.
The features of the Micro Disk format are:
File directory with ASCII file names.
Single file list which can store any number of files.
For each file, a name, the start block and the size in bytes is stored.
All files are stored in sequential blocks which makes reading simple and fast.
All files are aligned to the 512 byte blocks for a SD card.
I created a symmetrical logic‑gate diagram and challenge you to spot its function. Study the image, try simplifying the design, and use the provided hints if needed. If you enjoy puzzles or digital logic, read the full post for extra challenges and to compare solutions.
I updated my pet-feeder's drive with a TMC2209 SilentStepStick and a 17HS19 stepper to get near‑silent operation and run from 5V. I built a simple Pico-based controller, adjusted gearing for speed, and tested sensors. Read the full update for photos, choices and test notes.
I walk you through designing the final PCB for a low-cost plant watering sensor: choosing tools, shaping the board, iterative layouts, BOM decisions, assembly planning and unit-cost calculations. If you want practical steps and cost details, please read the full post to follow the next parts.
I explain how C++ namespaces prevent name conflicts and why they matter, especially in Arduino projects. I walk through practical patterns—prefixing, selective using-declarations, and importing a namespace—with class and global examples. Read the full post for simple, pragmatic examples to keep your code clearer and conflict-free.
I’ve released a major update to my 3D-print storage box system: expanded sizes (up to 6x6 and 9x9 split), improved geometries, 3MF files, JPEG previews, and more dividers. If you use my boxes or print them yourself, read the full post for download links, compatibility notes, and printing tips.
I tested 13 SMD LEDs for my plant-watering sensor project, soldering them to a small board and driving them from an Arduino Zero Pro to compare brightness and flash styles. I share photos, part numbers and a short demo video — read on if you’d like the full results and notes.