Your robot can also draw pictures! Between the wheels is a pen holder that can hold most felt-tip pens that have a thin nib.

Choose a colour of pen and insert it into the holder as shown.

You can adjust the holder to move the arms in or out. Note that the arms should be close to the pen but not grip it too tightly. This is because the pen should be able to just slip in the holder so the weight of the pen pushes down on the paper to leave a mark. If your pen doesn't draw, then that will most likely be the problem.

Your first challenge is to draw the six shapes shown here.

We suggest you use a scrap piece of paper or two to do all of your tests, and then when each program is working, place the robot on your 'good' piece of paper to draw the shape you want.

The shapes should all be small enough to fit on a single piece of paper.

Now you get to draw whatever you want. Be creative!

You will probably only be limited by:

• Not being able to lift the pen off the paper
• The accuracy of the movements you can make - small errors in the movements can add up with more complex drawings.
• Your own imagination!

Actually the first of these limitations you can probably get around if you are clever. Can you think of a way? Read the next step if you need some ideas!

N.B. Why don't you try putting a pause in your program when you want to remove the pen or swap it for another colour? You could play a sound to tell you when you need to change the pen or lift it out/put it back in. Or you could even use the coloured lights to tell you what colour pen you need to use (white could mean no pen for when you need to 'lift' the pen).

You could even use a button press to indicate you have made the change and to continue your program!

Can you make a cool-looking geometric drawing that has curves in? The next few steps will show you some ideas, but what you choose to do is up to you!

You can get the effect of curved lines just using straight lines. Can you see how this works from the drawing here?

Here's another cool design just using straight lines

You can even change the colours of the pens during your drawing.

For a real challenge can you create a drawing using continuous curved lines?

Hint: You'd need to use variables that continually changed and get your robot to move different distances or turn different amounts as the variables changed. In the 'Maths' group there are some blocks you might want to experiment with that have mathematical functions that could create some interesting curves. There's even a 'random' block here you could try out!