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move lessons out of web site

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will move select lessons back to "educators" section
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Tom Ball
2016-06-14 11:49:58 -04:00
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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.
Welcome! This activity will teach how to construct a pendulum that glows using acceleration. Let's get started!
Turn on all the LEDs.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
```
Create a **forever** loop that will constantly display the appropriate brightness on the LED display.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
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.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
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.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
basic.forever(() => {
let 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.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
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.
```blocks
basic.showLeds(`
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
`)
basic.forever(() => {
let acceleration = input.acceleration(Dimension.Y);
acceleration = Math.abs(acceleration);
acceleration = acceleration / 4;
led.setBrightness(acceleration)
});
```
### ~avatar avatar
Excellent, you're ready to continue with the [challenges](/lessons/glowing-pendulum/challenges)!
### ~