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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A Sunset Cache Box
What does it take to build a geocaching box that can only be opened at sunset? A box, a button, an electronic lock, an electronic clock, and a controller that ties everything together.
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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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Running on Batteries
Running on batteries does not carry your Arduino project very far? Well, when you want to run an Arduino project on batteries, you have to spend some thought on minimizing power consumption. Here we will look at what you can do when you use an AVR MCU. Often you will be able to reduce the average current consumption to a few microamps!
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