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Designing Embedded Systems with PIC Microcontrollers, 2nd Edition by Tim Wilmshurst

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CHAPTER 20. Connectivity and networks
Despite all that has been covered in the past 19 chapters, there are still important areas in embedded systems which have been little mentioned. One area is so important that this chapter is dedicated to it.
If you implemented the hand controller board on the Derbot AGV, and maybe another I2C device, then you created a little network. This approach is being replicated in every sort of situation, where different systems or subsystems are communicating with each other. In the home, workplace, motor vehicle, factory and across the world, thinking things are organising themselves into networks. Their means of communication are becoming increasingly diverse: not just electrical, but also optical fibre, infrared ...

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