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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Parasitic Power Supply
In parasitic power supply mode, a device sucks its juice from a data line instead of from the power rail. This can be intended or unintended. In the latter case, all sorts of funny things can happen.
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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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