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docs/reference/js/lessons/glowing-pendulum/activity.md

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+# glowing pendulum activity
+
+construct a pendulum that glows using acceleration. #docs
+
+### ~avatar avatar
+
+Welcome! This guided activity will teach how to construct a pendulum that glows using acceleration. Let's get started!
+
+### ~
+
+To create a new script, go to the [Create Code](/microbit/create-code) page and tap *New Project* under **Touch Develop**.
+
+Create a **forever** loop that will constantly display the appropriate brightness on the LED display.
+
+```
+basic.forever(() => {
+})
+```
+
+Now let's measure the acceleration on the `y` axis and store that value in a variable. The `input->acceleration("y")` function will provide the value.
+
+```
+basic.forever(() => {
+    let acceleration = input.acceleration("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.
+
+```
+basic.forever(() => {
+    let acceleration1 = input.acceleration("y")
+    acceleration1 = math.abs(acceleration1)
+})
+```
+
+The function `input->acceleration("y")` returns a number between 0 and 1024. We want to use this value for the brightness of the micro:bit, but the `led->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.
+
+```
+basic.forever(() => {
+    let acceleration2 = input.acceleration("y")
+    acceleration2 = math.abs(acceleration2)
+    acceleration2 = acceleration2 / 4
+})
+```
+
+Now let's use our acceleration value to set the brightness on the BBC micro:bit.
+
+```
+basic.forever(() => {
+    let acceleration3 = input.acceleration("y")
+    acceleration3 = math.abs(acceleration3)
+    acceleration3 = acceleration3 / 4
+    led.setBrightness(acceleration3)
+})
+```
+
+Let's show what the brightness of the micro:bit is by turning all the LEDs on!
+
+```
+basic.forever(() => {
+    let acceleration4 = input.acceleration("y")
+    acceleration4 = math.abs(acceleration4)
+    acceleration4 = acceleration4 / 4
+    led.setBrightness(acceleration4)
+    led.plotAll()
+})
+```
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/microbit/lessons/glowing-pendulum/challenges)!
+
+### ~
+

docs/reference/js/lessons/glowing-pendulum/challenges.md

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+# glowing pendulum challenges
+
+Coding challenges for the glowing pendulum tutorial. #docs
+
+## Before we get started
+
+Complete the following guided tutorial:
+
+* [tutorial](/microbit/lessons/glowing-pendulum/tutorial)
+
+At the end of the tutorial, click `keep editing`. Your code should look like this:
+
+```
+basic.forever(() => {
+    let acceleration = input.acceleration("y")
+    acceleration = math.abs(acceleration)
+    acceleration = acceleration / 4
+    led.setBrightness(acceleration)
+    led.plotAll()
+})
+```
+
+**Challenge 1**
+
+![](/static/mb/lessons/glowing-pendulum-0.jpg)
+
+Hold the BBC micro:bit in your hand in a dark room. Move the BBC micro:bit like a pendulum, and produce a slow image that captures the pattern of the BBC micro:bit LEDs.
+
+**Challenge 2**
+
+Replace "y" in `[input->acceleration("y")] with "x" or "z". Changing the axis will cause the BBC micro:bit to measure the force in a different direction. What differences in the resulting pattern does this replacement make?
+

docs/reference/js/lessons/glowing-pendulum/quiz-answers.md

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+# glowing pendulum quiz answers
+
+construct a pendulum that glows using acceleration #LED #number #math #acceleration #docs
+
+## Name
+
+## Directions
+
+Use this activity document to guide your work in the [glowing pendulum tutorial](/microbit/lessons/glowing-pendulum/tutorial)
+
+Answer the questions while completing the tutorial. Pay attention to the dialogues!
+
+## 1. Why are you creating a 'forever' loop?
+
+<br/>
+
+We are creating a forever loop to constantly display the appropriate brightness on the LED display.
+
+## 2. Write the line of code to measure the acceleration with respect to the "y" axis and store this value in a local variable called 'acceleration'.
+
+<br/>
+
+```
+let acceleration = input.acceleration("y")
+```
+
+## 3. After storing the acceleration in a variable, write the code to take the absolute value of the acceleration, and store this value inside 'acceleration'.
+
+<br/>
+
+```
+acceleration = math.abs(acceleration)
+```
+
+## 4. Write the code that uses the acceleration value from question #3 to set the brightness on the BBC micro:bit.
+
+<br/>
+
+```
+acceleration = acceleration / 4
+led.setBrightness(acceleration)
+```
+
+## 5. Write the code that tuns all the LEDs on (as the image displays below)
+
+![](/static/mb/lessons/glowing-pendulum-1.png)
+
+<br/>
+
+```
+led.plotAll()
+```
+

docs/reference/js/lessons/glowing-pendulum/quiz.md

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+# glowing pendulum quiz
+
+construct a pendulum that glows using acceleration #LED #number #math #acceleration #docs
+
+## Name
+
+## Directions
+
+Use this activity document to guide your work in the [glowing pendulum tutorial](/microbit/lessons/glowing-pendulum/tutorial)
+
+Answer the questions while completing the tutorial. Pay attention to the dialogues!
+
+## 1. Why are you creating a 'forever' loop?
+
+<br/>
+
+## 2. Write the line of code to measure the acceleration with respect to the "y" axis and store this value in a local variable called 'acceleration'.
+
+<br/>
+
+## 3. After storing the acceleration in a variable, write the code to take the absolute value of the acceleration, and store this value inside 'acceleration'.
+
+<br/>
+
+## 4. Write the code that uses the acceleration value from question #3 to set the brightness on the BBC micro:bit.
+
+<br/>
+
+## 5. Write the code that tuns all the LEDs on (as the image displays below)
+
+![](/static/mb/lessons/glowing-pendulum-1.png)
+
+<br/>
+