Inter-Integrated Circuit, pronounced as I-Squared-C or I-two-C, uses a single data line and a clock to communicate between multiple sensors connected to the controller. This protocol is very good for on-board or short-range communication.
For example, the BH1750 from the ROHM semiconductor is an ambient light sensor that measures the ambient light around the sensor in Lux. This sensor exposes its data to the controller over the I2C bus. Read more about BH1750 here: http://www.mouser.com/ds/2/348/bh1750fvi-e-186247.pdf.
This protocol can be used for controller-to-controller communication as well.
This wraps up our exploration of the smart device layer.
In this book, we are going to work with Raspberry Pi 3 as our controller and the DHT11 ...
