Exercise 5 - Abstraction & Modeling

Exercise 5

System Model:

The team will create a system that models a basic transmitter/receiver circuit. The circuit will contain modules that:

• Convert data packets into a digital binary signal
• Convert digital binary signal into analog signal
• Control the frequency of light oscillation using the analog signal
• Capture the analog signal with a solar receiver
• Convert the analog signal back to digital binary
• Restore the data packets into a file

Using these modules, the team will create a system model to generate and transfer signals from one interface to another. The implementation several attributes to each entity will allow for a more rigid and robust structure that can handle multiple file types and signal transfer methods.

Process Model:

After instantiating instances of the above modules, each entity will contain several attributes which define the behaviors of the system model and process model. The following attributes will be implemented in LiFi's system model:

Convert data packets into a digital binary signal

• Script to convert string characters to binary
• Script to convert PDF's and other file formats to binary

Convert digital binary signal into analog signal

• Basic digital to analog converter
• ADC implementation on Arduino and Raspberry Pi
• Signal input from above module
• Signal output to lamp

Control the frequency of light oscillation using the analog signal

• Capture analog input from ADC and store in an array
• Voltage rectifier on lamp with transistor allows control of voltage
• Pulse-width modulation techniques to send signals over lamp
• Continuous emission of steady-state light to send signals

Capture the analog signal with a solar receiver

• Continuous echo for solar receiver to capture solar signals
• Converts signals by default to analog voltages

Convert the analog signal back to digital binary

• Basic digital to analog converter restores the signal back to binary
• Signal input from the solar receiver
• Signal output to packet restoration interface

Restore the data packets into a file

• Script to convert binary values back into a file

Using the above modules and attributes, the team will be able to implement a functioning proof-of-concept for the LiFi circuit. Each module will be implemented using either hardware circuitry from the Raspberry Pi, or software integration in .NET which is a C# family language. A GUI will be created for most modules so that user interaction is streamlined and enhanced.