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2-Wire Interface 3.0

2-Wire Interface 3.0
Klaus Jürgen Thiesler’s ‘2-Wire Interface’ was published in Elektor magazine in the form of both basic and low-current versions. Each variant used two transistors and a handful of other components to hook up an LED and a pushbutton to a microcontroller. The author still felt driven to simplify this arrangement further and can now provide a solution that, with only two resistors and a single I/O pin, could hardly be minimalized any more.
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