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# glowing pendulum blocks lesson
construct a pendulum that glows using acceleration #var #acceleration #abs #brightness #plot #docs
## Topic
Acceleration
## Quick Links
* [activity ](/microbit/lessons/glowing-pendulum/activity )
* [challenges ](/microbit/lessons/glowing-pendulum/challenges )
## Class
Year 7
## 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
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```docs
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basic.forever(() => {
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})
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let x = 0
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input.acceleration(Dimension.X)
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Math.abs(0)
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led.setBrightness(255)
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basic.showLeds(`
. . . . .
. . . . .
. . # . .
. . . . .
. . . . .
`)
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```
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## Objectives
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* 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
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