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System Description Of The System

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CHAPTER 2

SYSTEM DESCRIPTION

2.1. System Functions
The following functions are performed by the system circuit:
1. Signal the microprocessor when any module send data to it.
2. Convert analog inputs.
3. Process the input data.
4. Communicate with the Ethernet module to send and receive data
5. Convert to the data output
6. Send output signal to output modules.

2.2. System Block Diagram Design
Based on the design requirement and specifications, the system block diagram shown on Figure 2.1 is developed. This block diagram defines all the function to be performed by the system. A modular approach to project design was taken. The system is designed around an Arduino Mega2560 which is based on an Atmel2560 microprocessor.
In the following section, some of the basic concept of circuit that are used in the system design are explained. Figure 2.1 System Block Diagram
2.3. Microcomputer Organization
A microcomputer is a device that operates on binary information. A typical microcomputer consists of:
1) A Central Processor Unit (CPU)
2) A Memory (RAM and ROM)
3) Input/output (I/O) ports
All these units communicate to each other through a bus structured organization as shown in Figure 2.2.
1) The CPU bring the entire system together. The function implemented by the other elements is under CPU control. Also, all instructions from memory will be fetched by CPU. Therefor all the binary substances will be decoded and become executive. A typical CPU contain of the following

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