pxt-calliope/docs/projects/smiley-buttons.md

Use buttons to show a smiley or frowny face.

Step 1

Use show leds to make a smiley face:

basic.showLeds(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .`);

Step 2

Add an input block for when button A is pressed, and put a frowny face inside it:

basic.showLeds(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .`);
input.onButtonPressed(Button.A, () => { 
    basic.showLeds(`
    . # . # .
    . # . # .
    . . . . .
    . # # # .
    # . . . #`);
});

Step 3

Now add blocks so that when button B is pressed, a smiley appears:

basic.showLeds(`
. # . # .
. # . # .
. . . . .
# . . . #
. # # # .`);
input.onButtonPressed(Button.A, () => { 
    basic.showLeds(`
    . # . # .
    . # . # .
    . . . . .
    . # # # .
    # . . . #`);
});
input.onButtonPressed(Button.B, () => { 
    basic.showLeds(`
    . # . # .
    . # . # .
    . . . . .
    # . . . #
    . # # # .`);
});