Algorithms and Flowcharts : Flowchart Examples

Flowchart Example One : Simple Greenhouse Temperature Control System

This control system is used to keep a greenhouse warm in the Winter. It keeps the temperature of the greenhouse above 20°C. If the temperature drops below 20°C then a heater is turned on to warm the greenhouse up.

The important components of this system are :

• A temperature sensor.
• A heater.

The control system has these input and output devices :

The operation of the system is described by this flowchart :

Flowchart Example Two : Macro To Sort A Football League Table

A spreadsheet has been created which shows the league positions of some football teams in a league. Whenever a team plays a match the team's points score and position in the league may change. After each match the league table must be sorted to put the teams in the correct order. The actions required to complete this task in the spreadsheet are :

• Select the area of the spreadsheet that contains the data to be sorted (the league table).
• Choose which piece of information (e.g. points) in the table you want to use to order the data.
• Select whether you want to put the data in ascending or descending order.

A macro has been created to automate this process. The macro is described by this flowchart :

GCSE ICT Companion 04 - (C) P Meakin 2004