Physical design of Internet of Things(IoT).

• The Things/Devices and protocols that are used to construct an IoT system are referred to as the physical design of the system. 
• These items collectively refer to as "Node Devices," each of which has an individual identity and is capable of remote sensing, actuation, and monitoring. 
• The protocols that are employed to create an internet-based communication channel between the Node devices and servers.

• In an IoT system, Things/Devices are utilized to establish a connection, process data, offer interfaces, offer storage, and offer graphical user interfaces. 
• Each of them produces data in a format that can be examined by an analytical program and system to carry out tasks and enhance the system. 

For instance, an algorithm is used to identify the data generated by a temperature sensor that is used to examine the temperature at a certain place.

Connectivity

• Devices like USB hosts and ETHERNET are used for connectivity between the devices and the server.

Processor

• A processor like a CPU and other units are used to process the data. these data are further used to improve the decision quality of an IoT system.

Audio/Video Interfaces

• An interface like HDMI and RCA devices is used to record audio and videos in a system.

Input/Output interface

• To give input and output signals to sensors, and actuators we use things like UART, SPI, CAN, etc.

Storage Interfaces

• Things like SD, MMC, and SDIO are used to store the data generated from an IoT device.
• Other things like DDR and GPU are used to control the activity of an IoT system.

IoT Protocols