pxt-calliope/docs/lessons/glowing-pendulum.md

# glowing pendulum blocks lesson

construct a pendulum that glows using acceleration.

## Topic

Acceleration

## Quick Links

* [activity](/lessons/glowing-pendulum/activity)
* [tutorial](/lessons/glowing-pendulum/tutorial)
* [challenges](/lessons/glowing-pendulum/challenges)
* [quiz](/lessons/glowing-pendulum/quiz)
* [quiz answers](/lessons/glowing-pendulum/quiz-answers)

## Prior learning/place of lesson in scheme of work

Learn how to get the acceleration **acceleration**, `acceleration` value (g-force), in one of three specified dimensions. We will be learning how to get the acceleration using forever loop, a local variable, acceleration, the math library, as well as simple commands, such as led set brightness and led plot all.

## Documentation

```cards
basic.forever(() => {})
let x = 0
input.acceleration(Dimension.X)
Math.abs(0)
led.setBrightness(255)
basic.showLeds(`
    . . . . .
    . . . . .
    . . # . .
    . . . . .
    . . . . .
    `)
```

## Objectives

* learn how to repeat code in the background forever
* learn how create a local variable to store data, so that you can use it in your code
* learn how to get the acceleration value (g-force), in one of three specified dimensions
* learn how to return the absolute value
* learn how to sets the brightness of the LED screen
* learn how to turn on all the LED lights on the LED screen