pxt-microbit/docs/projects/python/smiley-buttons.md

micro:bit target for Microsoft MakeCode (PXT)

# Smiley Buttons

### @explicitHints true

## Code a micro:bit emoji! @unplugged

Code the buttons on the @boardname@ to show that it's happy or sad.
(Want to learn how the buttons works? [Watch this video](https://youtu.be/t_Qujjd_38o)).

![Pressing the A and B buttons](/static/mb/projects/smiley-buttons/sim.gif)

## {Step 1}

Put in an ``||input:on button pressed||`` event to run code when button **A** is pressed.

```python
def on_button_pressed_a():
    pass
input.on_button_pressed(Button.A, on_button_pressed_a)
```

## {Step 2}

Use ``||basic:show icon||`` to display a **Happy** face on the screen.

Press the **A** button in the simulator to see the smiley.

```python
def on_button_pressed_a():
    basic.show_icon(IconNames.HAPPY)
input.on_button_pressed(Button.A, on_button_pressed_a)
```

## {Step 3}

Use another ``||input:on button pressed||`` with a ``||basic:show icon||`` inside to display a **Sad** face when button **B** is pressed.

```python
def on_button_pressed_a2():
    basic.show_icon(IconNames.SAD)
input.on_button_pressed(Button.B, on_button_pressed_a2)
```

## {Step 4}

Add a secret mode that happens when **A** and **B** are pressed together. For this case, use ``||basic:show icon||`` multiple times to create an animation.

```python
def on_button_pressed_a3():
    basic.show_icon(IconNames.SILLY)
    basic.show_icon(IconNames.SURPRISED)
input.on_button_pressed(Button.AB, on_button_pressed_a3)
```

## {Step 5}

Click ``|Download|`` to transfer your code to your @boardname@ (if you have one). Try buttons **A**, **B** and then **A** and **B** together.