If you are old enough, you probably remember the Y2k bug. Now, mankind should have learned from it, right? Wrong!
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Everything You Wanted to Know About Real-Time Clocks but Were Afraid to Ask
What is a real-time clock? Why do you need one? What are the use cases? How accurate can a real-time clock be? Which features can a real-time clock have? Which models are around? And which one should you buy?
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Synchronism
In 2013, we found the Seattle-Köln Exchange Multicache, which requires cooperation between geocachers from Cologne and Seattle. This led to the idea of a geocache where two people at different locations had to press a button at exactly the same time in order to be able to open their respective cache boxes. And now the idea has become a reality!
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Timing the Timekeeper
What is the overhead imposed by the millis() interrupt? And can we get rid of it?