Logo for Beginners

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# Logo for Beginners - PowerPoint PPT Presentation

Logo for Beginners. By Chris 9S. What are control systems. A control system uses microprocessors to control physical conditions. This is used for: Air condition Central Heating Medical Applications Car Manufacture plants Process Control.

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## Logo for Beginners

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Presentation Transcript

### Logo for Beginners

By Chris 9S

What are control systems
• A control system uses microprocessors to control physical conditions.
• This is used for:
• Air condition
• Central Heating
• Medical Applications
• Car Manufacture plants
• Process Control

Physical Conditions (or variables) that are controlled by microprocessors are:

• Temperature
• Pressure
• Humidity
• Light
• Moisture
What is Logo?
• Logo is a simulation of a control system
• It uses a triangular turtle shape as its cursor
• It is a program developed by MIT (Massachusetts Institute of Technology)
Some Basic Commands
• fd= moves turtle forward e.g. fd 40
• bk= moves turtle backward e.g. bk 50
• rt= rotates turtle right e.g. rt 70
• lt= rotates turtle left e.g. lt 90
• pu= pen up
• pd= pen down
How to make a square?
• fd 80
• rt 90
• fd 80
• rt 90
• fd 80
• rt 90
• fd 80
• rt 90

or

repeat 4 [fd 80 rt 90]

Repeat Command
• The repeat command is used when you want to repeat a structure commands again and again e.g. any polygon
• To use ‘repeat’ in logo, you need to know by what angle you need to turn the turtle.
• You would need to do 360/(number of sides).
• E.g. Hexagon angle= 360/6= 60

This means that you would do type in:

• repeat 6 [fd 80 rt 60]
• Note: don’t use these brackets: () and {}
• Always use this bracket: []
How to draw a circle
• To draw a circle, you would type:
• repeat 360 [fd 1 rt 1]
Procedures
• A procedure is a single command that you would type in the command box and it will produce a series of commands to produce a drawing e.g. “house”
Sub-routine
• A sub-routine is a series of commands that you would put in the procedure e.g. circle
• The following sub-routines were used to build the house

+

+

+

=

Small Circle for the knob

Pentagon for the house door

Square for body of house

Triangle for roof

Variables
• A Variable is a numeric data that can be keep on changing e.g. numerical data in a cell in Microsoft Excel.
• Variables are useful when they are more or less amount of numbers appear e.g. clients in a cliental list
Variables in MSWLOGO
• When using the repeat command in LOGO, you can change the length of the square without having to keep going to Edall and changing the length
• Ex. If you would want to do a square, copu into edall:
• To square :length

repeat 4 [fd:length rt 90]

end

• To make the square of length 100 you insert “square 100” in the command box
Where to get MSWLOGO
• This Website: http://mswlogo.en.softonic.com/
• Its free and virus-free!