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docs/lessons/glowing-pendulum/activity.md

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+# glowing pendulum block activity
+
+Construct a pendulum that glows using acceleration. 
+
+To create a new script, go to the [Create Code](/microbit/create-code) page and tap `New Project` under `Block Editor`.
+
+Welcome! This activity will teach how to construct a pendulum that glows using acceleration. Let's get started!
+
+Create a **forever** loop that will constantly display the appropriate brightness on the LED display.
+
+
+```blocks
+basic.forever(() => {
+    
+})
+```
+
+Now let's measure the acceleration on the `y` axis and store that value in a variable. The `acceleration(y)` function will provide the value.
+
+![](/static/mb/blocks/lessons/glowing-pendulum-1.png)
+
+```blocks
+basic.forever(() => {
+    let acceleration = input.acceleration(Dimension.Y);
+});
+```
+
+Since the micro:bit will be swinging back and forth, the acceleration will only be positive half of the time. Thus, to always get a positive value, we want to take the absolute value of the acceleration.
+
+![](/static/mb/blocks/lessons/glowing-pendulum-2.png)
+
+```blocks
+let acceleration = 0;
+basic.forever(() => {
+    acceleration = input.acceleration(Dimension.Y);
+    acceleration = Math.abs(acceleration)
+});
+```
+
+The function `acceleration(y)` returns a number between 0 and 1024. We want to use this value for the brightness of the micro:bit, but the `set brightness()` only accepts a value between 0 and 256. Thus, we need to divide the acceleration by 4 to ensure we will be in the appropriate range.
+
+![](/static/mb/blocks/lessons/glowing-pendulum-3.png)
+
+Now let's use our acceleration value to set the brightness on the micro:bit.
+
+![](/static/mb/blocks/lessons/glowing-pendulum-4.png)
+
+Let's show what the brightness of the micro:bit is by turning all the LEDs on!
+
+![](/static/mb/blocks/lessons/glowing-pendulum-5.png)
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/microbit/lessons/glowing-pendulum/challenges)!
+
+### ~
+

docs/lessons/glowing-pendulum/challenges.md

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+# glowing pendulum blocks challenges
+
+Coding challenges for the glowing pendulum tutorial. 
+
+## Before we get started
+
+Complete the following [glowing pendulum activity](/microbit/lessons/glowing-pendulum/activity) and your code should look like this:
+
+![](/static/mb/blocks/lessons/glowing-pendulum-5.png)
+
+**Challenge 1**
+
+![](/static/mb/lessons/glowing-pendulum-0.jpg)
+
+Hold the micro:bit in your hand in a dark room. Move the micro:bit like a pendulum and produce a slow image that captures the pattern of the micro:bit LEDs.
+
+**Challenge 2**
+
+Replace "y" in `acceleration(y)` with "x" or "z". Changing the axis will cause the micro:bit to measure the force in a different direction. What differences in the resulting pattern does this replacement make?
+