a guide to using roamer

A Guide ToUsing Roamer

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Menu1. Clear Roamers ‘Go’ Memory2. Change Step Size3. Forwards4. Backwards5. Turning Right6. Turning Left7. Putting it all together8. Clearing The Last Entry9. Explaining ‘Repeat’10. Repeat Instructions11. Shapes12. Making Music

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1. Clear the Roamers ‘Go’ Memory

To clear the Roamer's memory press CM CM.The first time CM is pressed a warning is sounded. If it

has been pressed by mistake, press another key or wait 10 seconds and the first press will be ignored.

CM CM

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2. Change Step Size

Roamer’s standard step size is the length of its own body i.e. 30cm.

To change the steps that the roamer takes press

This will change each step to 15cm. Change the yellow numbers to change the step sizes.

1 5 [ ][ ] GO

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3. Forwards

The roamer moves forwards in roamer sized steps of 30cm.

To move forwards 30cm press

To move forwards 60cm, 90cm etc. Change the to , etc.

1 GO

12 3

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4. Backwards

The roamer moves backwards in roamer sized steps of 30cm.

To move backwards 30cm press

To move backwards 60cm, 90cm etc. Change the to , etc.

1 GO

12 3

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5. Turning Right

To tell roamer to turn, he needs to know the number of degrees.

Roamer will need a set of instructions like this:

The 9 and 0 stand for 90o and should be changed to fit the turn you want.

9 GO0

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6. Turning Left

To tell roamer to turn, he needs to know the number of degrees.

Roamer will need a set of instructions like this:

The 9 and 0 stand for 90o and should be changed to fit the turn you want.

9 GO0

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7. Putting It All TogetherThe instructions you have learnt so far can be added together into a sequence.

Press at the end.

Remember to clear the memory before you start.

is the same as saying go forward 10 spaces. Roamer will move forward 6 spaces and then move forward again 4 spaces. 6 + 4 =

10

CM CM 6 4 GO

GO

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Putting It All Together

CM CM

5 9 0 1

GO

Roamer will move forward 5 spaces then right turn 90o and then move forward 1 space

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8. Clearing The Last Entry

If you make a mistake, then

cancels the last entry

CE

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9. Explaining Repeat

When you know how to write a sequence of instructions the next stage is getting some

instructions to repeat. Repeat means to do the same thing again a set

number of times.

Look at the example on the next slide.

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Repeat• To make this pattern, roamer needs to go -

forward 1 space turn 90o to the left forward 1 space turn 90o to the right forward 1 space turn 90o to the left forward 1 space turn 90o to the right

The instructions are repeated 2 times.

If the pattern continued then you can see it

would repeat the same instructions again and

again.

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10. Repeating InstructionsCMCM

2R[]

19 019 0

[] GO

Clear Go Memory

Repeat No. Of Repeats

Open Brackets

Instructions

Close Brackets Go

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11. Shapes

Use the repeat command to make shapes Click on the shape to find out more

Back to ‘Shapes’

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How many times are the instructions repeated?

Try making a square using the button. If you get stuck click on the square for help.

Can you make squares of different sizes?

What do you need to change?

SquareForward 2Right Turn 90o

Forward 2Right Turn 90o

Forward 2Right Turn 90o

Forward 2Right Turn 90o

R

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CM CMR 4 [ FORWARD 2 RIGHT TURN 90O

]GO

90o

90o

Back to ‘Shapes’

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Pentagon

How many times will the instructions repeat?

Have a look at the instructions for a square and triangle and see if you can

see a pattern.

RTry making a pentagon using the button. If you get stuck click on the pentagon for help.

Can you make pentagons of different sizes? Can you make irregular pentagons? The internal angles add up to 540o

Have a go!

Clue: Each angle of turn for Roamer is 72o

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CM CMR 5 [ FORWARD 2 RIGHT TURN 72O

]GO

The internal angles are each 108o for a regular pentagon. (Think of Roamer continuing in a straight line and turning from that line. Remember angles on a straight line add up to 180o and 180-108= 72)

108o

108o

108o108o

108o

72o

Back to ‘Shapes’

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TriangleForward 2Right turn 120Forward 2 Right turn 120Forward 2Right turn 120

How many times are the instructions repeated?

RTry making a triangle using the button. If you get stuck click on the triangle for help.

Can you make triangles of different sizes? Can you make different shaped triangles?

What do you need to change?

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Try

CM CMR 3 [ FORWARD 2 RIGHT TURN 120O

]GO

Look at the angles of the triangle. Are they right angles?

The internal angles of a triangle add up to 180o

For this triangle, each internal angle is 60o

Roamer needs to turn 120o as angles on a straight line add up to 180o

60 o

120 o

60o

60o 60o

Back to ‘Shapes’

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Rectangle

Where do the instructions repeat? How many times?

Why are the instructions a bit more complicated?RTry making a rectangle using the button.

If you get stuck click on the rectangle for help.

Forward 4Right turn 90o

Forward 2Right turn 90o

Forward 4Right turn 90o

Forward 2Right turn 90o

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CM CMR 2 [ FORWARD 4 RIGHT TURN 90O

FORWARD 2 RIGHT TURN 90O

]GO

90o

90o

Back to ‘Shapes’

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Try making a uniform cross using the button.

If you get stuck click on the cross for help. Can you make crosses of different sizes and widths?

Cross

Take care with the left and right turns with this shape.Have a look at the repeat pattern carefully.

R

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CM CMR 4 [ FORWARD 1 RIGHT TURN 90O

FORWARD 1 RIGHT TURN 90O

FORWARD 1 LEFT TURN 90O

]GO

Or try:

CM CMR 4 [ R2 [ FORWARD 1 RIGHT TURN 90O

] FORWARD 1 LEFT TURN 90O

]GO

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Making Music

Look for button with the musical note. press two numbers -

The first number tells Roamer the length of the note – 1 makes the shortest note, 8 makes the

longest note. The second number tells Roamer how high or low the note is – 1 makes the lowest note, 13

makes the highest note. 14 makes a rest (a silent note).

Carry on pressing different sets of 2 numbers to make a range of notes.

Then press Try it!

CMCM

GO