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updated glowing pendulum

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Michael Elliot Braun
2016-04-25 11:31:06 -07:00
parent 2bd66ae4ef
commit 76a18fa61b
2 changed files with 55 additions and 7 deletions
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44
docs/lessons/glowing-pendulum/activity.md
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@@ -15,8 +15,6 @@ 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. 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 ```blocks
basic.forever(() => { basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y); let acceleration = input.acceleration(Dimension.Y);
@@ -25,7 +23,6 @@ basic.forever(() => {
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. 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 ```blocks
let acceleration = 0; let acceleration = 0;
@@ -37,15 +34,50 @@ basic.forever(() => {
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. 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) ```blocks
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
});
```
Now let's use our acceleration value to set the brightness on the micro:bit. Now let's use our acceleration value to set the brightness on the micro:bit.
![](/static/mb/blocks/lessons/glowing-pendulum-4.png) ```blocks
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
led.setBrightness(acceleration)
});
```
Let's show what the brightness of the micro:bit is by turning all the LEDs on! 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) ```blocks
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
led.setBrightness(acceleration)
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
});
```
### ~avatar avatar ### ~avatar avatar

18
docs/lessons/glowing-pendulum/challenges.md
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@@ -6,7 +6,23 @@ Coding challenges for the glowing pendulum tutorial.
Complete the following [glowing pendulum activity](/lessons/glowing-pendulum/activity) and your code should look like this: Complete the following [glowing pendulum activity](/lessons/glowing-pendulum/activity) and your code should look like this:
![](/static/mb/blocks/lessons/glowing-pendulum-5.png) ```blocks
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
led.setBrightness(acceleration)
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
});
```
**Challenge 1** **Challenge 1**