pxt-calliope/docs/lessons/glowing-pendulum/challenges.md
2016-11-01 17:44:37 -07:00

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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](/lessons/glowing-pendulum/activity) and your code should look like this:
```blocks
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
led.setBrightness(acceleration)
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
});
```
### Challenge 1
![](/static/mb/lessons/glowing-pendulum-0.jpg)
Hold the @boardname@ in your hand in a dark room. Move the @boardname@ like a pendulum and produce a slow image that captures the pattern of the @boardname@ LEDs.
### Challenge 2
Replace "y" in `acceleration(y)` with "x" or "z". Changing the axis will cause the @boardname@ to measure the force in a different direction. What differences in the resulting pattern does this replacement make?