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This is because the devices are "addressable". The Two-Wire interface is extremely useful for connecting multiple devices, as they can all share the same two pins (plus a ground return). A lot of the details however will be of more general interest. This post describes how the I2C (Inter-Integrated Circuit, or "Two-Wire") interface works, with particular reference to the Arduino Uno which is based on the ATmega328P microprocessor chip. This page can be quickly reached from the link: A summary of everything shown below is available further down this page:
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