SPI Bus Cable Length – nRF24

There was a game called Labyrinth Ljubljana, and part of its technical solution was a Control Unit which controlled our custom made flashlights over RF link with cheap chinese module…

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How To Make Indestructible Housings – Labyrinth Ljubljana Flashlights

This is a post about what we think is the right approach to make an indestructible cases for your DIY projects. Imagine this scenario: take a group of people and…

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How To Use CNC For Plastics

Here is a reason why we used Cene the CNC for plastic milling. And here are few tips and tricks for CNCing plastics, in our case polyethylene: Use the sharpest drills…

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OpenFOAM meshing: a few shortcuts

Merging Files If you’re using SALOME to create STL files for meshing you can only save separate surfaces to separate files. That’s not a problem if you’re using snappyHexMesh but…

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RC Filter Frequency Pole Calculator

There are numerous RC filter pole calculators online and I happily used them for a quick calculations while DIYing. The problem is that these online calculators calculate frequency pole where gain…

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DIY Constrained Path Optimization

The Problem: Path optimization The exact origin of this problem is somewhat blurry but since I already have the solution I won’t put much effort into clarifying it. We have…

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STM32 USB CDC

By now almost all of my projects included some sort of communication with PC, mostly with external USB-UART bridge chip like MCP2200 or CP210x. Although this devices were mostly prototypes and/or…

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STM32 USB HID Mouse And Keyboard (guide)

There is a post (STM32 And Custom USB HID Device? Yes Please!) that gets a lot of attention, although at the time it was created, only vague “how-to” was presented.…

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