1.4 Hare

Today, we will use Button, Raspberry Pi and Scratch to create a hare with various changes!

When we press the first button, the hare in the stage area will change its body color; when we press the second button, the hare will change its body size; when we press the third button, the hare will take a step forward.

../_images/1.4_header.png

Build the Circuit

../_images/1.4_scratch_button.png

Load the Code and See What Happens

Load the code file (1.4_hare.sb3) into Scratch 3.

Now you can try to press each of the 3 buttons to see how the Hare on the stage will change.

Tips on Sprite

Click the Choose a Sprite button in the lower right corner of the sprite area, enter Hare in the search box, and then click to add it.

../_images/1.4_button1.png

Delete Sprite1.

../_images/1.4_button2.png

Tips on Codes

../_images/1.4_button3.png

This is an event block that is triggered when the level of GPIO17 is high, which means that the button is pressed at that moment.

../_images/1.4_button4.png

This is a block to change the color of Hare, the range of the value is 0 ~ 199, beyond 199 will change from 0 again.

../_images/1.4_button5.png

This is a block used to change the size for sprite, the higher the value, the larger the sprite.

Note

The sprite is also not infinitely large, and its maximum size is related to the original image size.

../_images/1.4_button6.png

This is a block that switches sprite costumes, and when Hare’s costume keeps switching, it does a series of coherent actions. For example, in this project, make Hare take a step forward.