pxt-calliope/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
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Complete the following [glowing pendulum activity](/lessons/glowing-pendulum/activity) and your code should look like this:
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![](/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?