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# charting lesson
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Measure the acceleration on the micro:bit in the "z" direction.
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## Topic
Acceleration
## Quick Links
* [activity ](/microbit/lessons/charting/activity )
## Prior learning/place of lesson in scheme of work
Learn the functions of **on data received** , **send number** and **receive number** and chart `plot bar graph` for `acceleration` in the "x" dimension.
## Documentation
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```cards
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basic.showNumber(0)
input.acceleration(Dimension.X)
led.plotBarGraph(0, 1023)
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radio.onDataReceived(() => {})
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radio.sendNumber(0)
radio.receiveNumber()
```
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## Objectives
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* learn how to repeat code in the background forever
* learn how to get the acceleration value (g-force), in one of three specified dimensions
* learn how to display a vertical bar graph based on the value and high value.
* learn how to register code to run when a packet is received over radio
* learn how to broadcast a number data packet to other micro:bits connected via radio
* learn how to read the next radio packet as a number data packet
