66 lines
1.3 KiB
Markdown
66 lines
1.3 KiB
Markdown
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# digi yoyo challenges
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These challenges will teach you how to create a counter 10 to 1. #docs
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**Challenge 0**
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### @video vimeo/134459911
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[This guided tutorial](/microbit/lessons/digi-yoyo/tutorial) will teach you how to make a counter from 0-9 using a while loop.
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```
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count = 1
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while (count < 10) {
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basic.pause(1000)
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basic.showNumber(count, 150)
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count = count + 1
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}
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```
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**Challenge 1**
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How about we create a counter that counts backwards from 10 to 1? Let's add a while loop that executes only when `count` is greater than 0.
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```
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count = 1
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while (count < 10) {
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basic.pause(1000)
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basic.showNumber(count, 150)
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count = count + 1
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}
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while (count > 0) {
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}
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```
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**Challenge 2**
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Inside of the while loop, let's add `pause->(1000)` so that we have a pause between each number as it's counting down. Also, let's show `count`!
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```
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count = 1
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while (count < 10) {
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basic.pause(1000)
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basic.showNumber(count, 150)
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count = count + 1
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}
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while (count > 0) {
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basic.pause(1000) // ***
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basic.showNumber(count, 150) // ***
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}
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```
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* Run the code to see if it works as expected.
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**Challenge 3**
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### @video vimeo/134449661
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Now, we need `count` to decrease by one after the micro:bit has displayed the value of `count`.
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We can do this by adding this line:
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```
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count = count - 1
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```
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