I made a simple 3d printed enclosure for Adafruit’s PowerBoost 1000C and a 1200mAh or smaller LiPo battery. This post contains all the files you need for the print, a list of components, and assembly instructions. My design uses three simple parts with tight tolerances. They are held together with two M3 screws and two…
Storage Boxes System Survey
Please take the following survey to help with further development of the storage boxes system. It is the best way to nudge future changes of the system into the direction you like. 😄 More Posts
New Storage Boxes
Today I published several new storage boxes with the label section placed at a different side. So, it will allow you to use the same box size in a drawer but keep all label orientations the same. The following two illustrations show the difference between the 1✕2 and 2✕1 size: Both boxes have exactly the…
Build and Heat Treatment of a Carbohydrate Source
In this short tutorial, I will explain step by step, how you can build a solid carbohydrate source. You will find the bill of materials and all required tools. I will use SI units to simplify all measurements. This is no quick build, the substances require long reaction and activation times. For this reason, the…
Logic Gates Puzzle 100
Assume, while digging out an ancient site from 450 AD, you found a mysterious stone with a digital display. Your analysis finds five inputs for five segments (a–e) and six outputs (1–6). It seems to be a classic multiplexed display. What is this display for? What is the highest continuous sequence of numbers it can…
Logic Gates Puzzle 11
The shown logic circuit performs a well known function; can you discover what it is? The circuit was not optimised for functionality, but to create a symmetric artwork. If you need to know the meaning of the used logic gate symbols, have a look at this Wikipedia page. Also, there are great videos from Ben…
Logic Gates Puzzle 10
The shown logic circuit performs a handy function; can you discover what it is? The circuit was not optimised for functionality, but to create a nice artwork and interesting puzzle. If you need to know the meaning of the used logic gate symbols, have a look at this Wikipedia page. Also, there are great videos…
Logic Gates Puzzle 1
What kind of logic circuit do you see here? This logic circuit was optimised for symmetry and art. Can you see which function is implemented in this circuit? You find more about logic gates and how they work on this Wikipedia page. Check the hints below, if you get stuck. Additional Challenges The logic circuit…
Bottle Opener for Elderly People or with Disabilities
Older people often have troubles opening plastic bottles. Also, people with gout or other disabilities lack the required strength to turn the small caps independently. The reason is the small diameter of the caps, which requires a strong grip with just two fingers. There exist a variety of helper tools, assisting this task by increasing…
Filtered RPM Measurement Using PIO
The Raspberry Pi RP2040 chip is a remarkable microcontroller. The programmable IO block (PIO) is only one of many great features of this chip. In this post, I show you a method of how to utilise PIO, to capture the speed of an attached PC fan with included software filter. Most fans have a feedback…