As we discussed, the main tasks of the monitoring systems are to interface sensor components and communicate the information generated by these sensors to the observers. You will be using Arduino Uno as the central microcontroller component to integrate these sensors and actuators. We also need a means of communication between the Arduino Uno and the control center and we will be utilizing the Arduino Ethernet Shield for this purpose. Let's discuss the hardware architecture of the monitoring station and its components.
We already designed units based on Arduino and the Ethernet Shield in various exercises in Chapter 8, Introduction to Arduino Networking, and Chapter 9, Arduino and the Internet of Things. Therefore, we have assumed that you are familiar with interfacing the Ethernet Shield with the Arduino board. We will connect various sensors and actuators with the Arduino board, as displayed in the following diagram...