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cpsc290 term paper

Weather Monitoring Station

By DFD, ERD,Data Dictionary

Jian Zhang

Problem statement

Weather monitoring station monitors weather conditions by recording and displaying various measurements.

Specification metrics

• Inputs of the system
•  
  • From users
  • From sensors

• Derived measures of the systems
•  
  • From the clock
• Output

•  
  • Displays of the system

Requirement specification

• The system must measure:
•  
  • Wind speed and direction
  • Temperature
  • Pressure
  • Humidity
• The system must derive:
•  
  • Wind chill
  • Dew point temperature
  • Temperature trend
  • Pressure trend
• The system must determine:
•  
  • Current date
  • Current time
• The system must continuously display:
•  
  • All the above measurements (primary as well as derived)
• The system should accept commands:
•  
  • To display the 24-hour high or low value of any one of the above measurements together with time and date
  • To calibrate its sensors against known values
  • To set the current date and time

DFD Diagram

Data Dictionary

Name: Weather monitoring station

Content

• Components description
•  
  • sensors
  • user
  • weather data record
  • weather data display
  • clock
• Model notational description
•  
  • DFD notational description
  • ERD notational description

Components role in ERD and DFD

Components descriptions

Name:

Sensor

Definition:

Instruments to measure weather data from environment. The type of sensor includes Thermometer, Anemometer, Barometer, and Humidity sensor.

Name:

User

Definition:

Person will request the data from weather monitoring station. Also he can send command to set clock, calibrate different of sensor.

Name:

Weather data record

Definition:

Computerized data record, including the date, time and primary weather data, including Wind speed and direction, Temperature, Pressure, Humidity

Name:

Weather data display

Definition:

Display that can display the primary and derived weather data, also will display the 24 hour high or low value.

Name:
Clock

Definition:

Determine the current date and current time. User can set the current time and date.

ERD notation description

DFD notation description

Components in DFD and ERD context