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Retro boombox becomes bluetooth speaker
For just a few dollars you can buy a small board that acts as a bluetooth audio device. This board allows you to build your own bluetooth speaker. But why build a new speaker when you still have an old…
Ernest
Filaments for 3D printing
I often get questions about what filament I use for 3D printing on my Creality CR-10s Pro, so I thought it would be nice to write a short article on this subject.
‘Sprouts Weekly’ – A machine to grow bean sprouts
I always have been fascinated by growing things in an automated way. For instance, I absolutely adore the FarmBot project and would really like to build such a machine once I’ve got time and money for it. Until then, I…
The Morse Challenge!
Geocaching is a popular hobby here in The Netherlands. Since my wife and I search for these caches from time to time, the idea came to me to build a cache myself, one that challenges geocachers to listen and decode…
Walt’s Keyer
Almost every nerd is a fan of automation. So whenever we find a repetitive job, we think of a solution to automate it. Since I’m both into automation and amateur radio, I was thinking on automating one of my straight…
Improving my CR-10s Pro 3D-printer
After three years of frequent operation, I decided to replace my Anet A6 3D-printer with the new Creality CR-10s Pro. I must say I’m very happy with this new machine in my shack: it’s easy to operate, the print quality…
Simple tweak for breadboard power modules
Nowadays breadboards are often sold with a breadboard power module and a bunch of jumper wires included. This power module allows you to easily apply 5 and/or 3.3 volt to the power rails of the breadboard using an external power…
Prepare for a new time!
Time… For some reason we tend to stick to an ancient system which has no logic at all. Let’s be honest: if we would invent a new time system nowadays, it would probably not have 7 days in a week,…
My first bat detector
During the summer season bats fly around almost every day in the twilight. I spot them in the evening, when they fly along our house and hunt for small flying insects, mostly mosquitoes and flies. Their soundless air show is…
Arduino Quick Reference Card
Some years ago I provided some workshops on local radioclubs, demonstrating the capabilities of Arduino boards. Along with the workshop I handed out a quick reference card to get started. Recently I was asked to do another workshop, so it…