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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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what are control systems
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
slide3

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

    • Temperature
    • Pressure
    • Humidity
    • Light
    • Moisture
what is logo
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
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
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
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
slide8

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
How to draw a circle
  • To draw a circle, you would type:
  • repeat 360 [fd 1 rt 1]
procedures
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
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
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
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
Where to get MSWLOGO
  • This Website: http://mswlogo.en.softonic.com/
  • Its free and virus-free!