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Logo for Beginners

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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  1. Logo for Beginners By Chris 9S

  2. 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

  3. Physical Conditions (or variables) that are controlled by microprocessors are: • Temperature • Pressure • Humidity • Light • Moisture

  4. 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)

  5. 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

  6. 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]

  7. 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

  8. 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: []

  9. How to draw a circle • To draw a circle, you would type: • repeat 360 [fd 1 rt 1]

  10. 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”

  11. 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

  12. 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

  13. 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

  14. Where to get MSWLOGO • This Website: http://mswlogo.en.softonic.com/ • Its free and virus-free!

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