pxt-calliope/docs/lessons/counter/challenges.md
Sam El-Husseini e3975e65e5 pxt-microbit Accessibility PR ()
* Accessibility changes
2017-09-07 13:42:08 -07:00

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# counter challenges
Coding challenges for the counter.
## Before we get started
Complete the following [guided tutorial](/lessons/counter/activity) At the end of the tutorial, click **keep editing**. Your code should look like this:
```blocks
let count = 0
input.onButtonPressed(Button.A, () => {
count = count + 1
basic.showNumber(count)
})
```
## Challenge 1
Let's add the code to `count` when `B` is pressed. Add an event handler with `on button pressed(B)` then add the code to `count`.
```blocks
let count = 0
input.onButtonPressed(Button.A, () => {
count = count + 1
basic.showNumber(count)
})
input.onButtonPressed(Button.B, () => {
count = count - 1
basic.showNumber(count)
})
```
## Challenge 3
Now let's try to reset the counter when the @boardname@ is shaken. You will need to register an event handler with `on shake`.