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docs/lessons/digi-yoyo/activity.md

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+# digi yoyo activity
+
+Create a counter with a while loop.
+
+### ~avatar avatar
+
+### @video td/videos/digi-yoyo-0
+
+Welcome! This tutorial will teach how to create a counter with a while loop. Let's get started!
+
+### ~
+
+Create a variable that acts as a counter and set it to 0.
+
+```blocks
+let count = 0
+```
+
+Add a while loop that will loop over and over until the variable `count` equals 10.
+
+![](/static/mb/blocks/lessons/digi-yoyo-1.jpg)
+
+```blocks
+let count = 0
+while (count < 10) {
+
+}
+
+```
+
+Let's add a pause. Then show the value of the the count.
+
+
+```blocks
+ let count = 0;
+while (count < 10) {
+    basic.pause(100);
+    basic.showNumber(count)
+}
+
+```
+
+Increase the value of count by one.
+
+
+```blocks
+let count = 0
+while (count < 10) {
+    basic.pause(100)
+     basic.showNumber(count)
+    count == count + 1
+}
+```
+
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/microbit/lessons/digi-yoyo/challenges)!
+
+### ~
+

docs/lessons/digi-yoyo/challenges.md

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+# digi yoyo challenges
+
+Coding challenges for the digi yoyo. 
+
+## Before we get started
+
+Complete the following [guided tutorial](/microbit/lessons/digi-yoyo/activity), your code should look like this:
+
+
+```blocks
+ let count = 0;
+while (count < 10) {
+    basic.pause(100);
+    basic.showNumber(count);
+    count = count + 1;
+    basic.pause(20);
+}
+```
+
+### Challenge 1
+
+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.
+
+
+```blocks
+ let count = 0;
+while (count < 10) {
+    basic.pause(100);
+    basic.showNumber(count);
+    count = count + 1;
+    basic.pause(20);
+}
+while (count > 0) {
+
+}
+
+
+```
+
+
+### Challenge 2
+
+### @video td/videos/digi-yoyo-1-2
+
+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`!
+
+
+
+```blocks
+ let count = 0;
+while (count < 10) {
+    basic.pause(100);
+    basic.showNumber(count);
+    count = count + 1;
+}
+while (count > 0) {
+    basic.pause(100);
+    basic.showNumber(count);
+}
+```
+
+
+* Run the code to see if it works as expected.
+
+### Challenge 3
+
+Now, we need `count` to decrease by one after the micro:bit has displayed the value of `count`.
+
+We can do this by adding this line:
+
+```blocks
+let count = count + (count - 1);
+```