CLI for dutch water data

Here in the Netherlands we have a public organisation named Rijkswaterstaat. This organization keeps track of all the water in and around our country. Think about sea levels, locks in rivers, etc. To do so they have an extensive network…

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CLog 1.2: maintenance release

There is a small but consistent group of users of my command line logbook software named ‘CLog’. The project has been hibernating for some years, however thanks to some user questions and issues I recently released version 1.2 (and today…

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…

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…

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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…

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SOTAbeams Go4Lo SWR-Power Indicator kit

Adrian PA0RDA heard about the SOTAbeams Go4Lo SWR-Power Indicator. Since it has an audible SWR indicator, it sounded interesting for blind operators. So he ordered a kit and asked me to build it. This article discusses my findings regarding this…

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CLog transferred to GitHub

Recently I have transferred the CLog software to my GitHub repository. I’m currently centralizing my code at GitHub since I wanted to get rid of sourceforge.net (my previous repository for CLog) and prefer GitHub nowadays.

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How to get rid of your prototype board

When you started discovering microcontrollers, you probably bought some kind of evaluation or prototype board. The microcontroller chip itself is placed in a nice socket on a PCB, surrounded by power circuit, some I/O, and RS232 or USB connector for…