pxt-calliope/docs/lessons/blink/challenges.md
2016-03-25 16:47:20 -07:00

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# blink blocks challenges
Coding challenges for the blink tutorial
## Before we get started
Complete the [blink](/microbit/lessons/blink/activity) activity and your code will look like this:
```blocks
basic.forever(() => {
led.plot(2, 2)
basic.pause(500)
led.unplot(2, 2)
basic.pause(500)
})
```
### Challenge 1
### @video td/videos/blink-1
Let's display a "smiley face" on the screen! We'll start by plotting the eyes.
Add `plot(1,1)` and `plot(3,1)` under `plot(2,2)` ; then add `unplot(1,1)`, `unplot(3,1)` and `unplot(2,2)` after `pause`. When you're ready, don't forget to run your code to try it out!
```blocks
basic.forever(() => {
led.plot(2, 2)
led.plot(1, 1)
led.plot(3, 1)
basic.pause(500)
led.unplot(2, 2)
led.unplot(1, 1)
led.unplot(3, 1)
basic.pause(500)
})
```
### Challenge 2
### @video td/videos/blink-2
Let's add the code to plot the mouth by using `plot` and `unplot` to the following coordinates: (1,4), (2,4) and (3,4). When you're ready, don't forget to run your code to try it out!
```blocks
basic.forever(() => {
led.plot(2, 2)
led.plot(1, 1)
led.plot(3, 1)
led.plot(1, 4)
led.plot(2, 4)
led.plot(3, 4)
basic.pause(500)
led.unplot(2, 2)
led.unplot(1, 1)
led.unplot(3, 1)
led.unplot(1, 4)
led.unplot(2, 4)
led.unplot(3, 4)
basic.pause(500)
})
```
### Challenge 3
### @video td/videos/blink-3
Let's keep using `plot` to convert the mouth into a smiley face.
```` bitmatrix
0 0 0 0 0
0 1 0 1 0
0 0 1 0 0
1 0 0 0 1
0 1 1 1 0
````
### Challenge 4
Let's make it blink a bit faster. To do so, we need to reduce the amount of time used in ``pause`` to 100 milliseconds.
### Challenge 5
Create your own image by changing the coordinates in `plot` and `unplot`!