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+# charting lesson
+
+Measure the acceleration on the micro:bit in the "z" direction.
+
+## Topic
+
+Acceleration
+
+## Quick Links
+
+* [activity](/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
+
+```cards
+basic.showNumber(0)
+input.acceleration(Dimension.X)
+led.plotBarGraph(0, 1023)
+radio.onDataReceived(() => {})
+radio.sendNumber(0)
+radio.receiveNumber()
+```
+
+## Objectives
+
+* 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