Project 14 XGO Acceleration

Ⅰ. Teaching Aims

Read the acceleration value of the on-board IMU (unit: mg or %, defined by the firmware).
Use a dot matrix to “broadcast” the acceleration in real time.
When the acceleration exceeds the threshold, enable XGO to provide built-in action feedback.

XGO + Foxbit + MicroBlocks IDE.
XGO battery power ≥ 60 %.
MicroBlocks status bar shows a green dot, XGO-lite extension is loaded and the development board model is Foxbit.


Functions	Output single-axis or composite acceleration
Tips	The firmware unit may be %(1g≈100) or mg

Functions	Scroll the string to a 5×7 dot matrix
Tips	The smaller the `pausing` is, the faster the scrolling speed will be

Functions	Execute according to the threshold branch
Tips	`<` and `≥` are also available

Functions	Perform the built-in wave action
Tips	When it cannot be found, a similar action can be used as a substitute

Functions	The body slides up and down, just like breathing
Tips	Z, positive for up, negative for down

Online code: Click here

Online code: Click here

If the pausing 100 ms of Test 1 is changed to 20 ms, what will be the scrolling effect?
What will occur in the action trigger frequency if the threshold is changed from 100 to 140 in Test 2? Why?
How to calculate the composite acceleration by sqrt(accX² + accY² + accZ²) so that the threshold is independent of direction?

Questions	Possible causes	Solutions
The value of acceleration remains almost unchanged	No `XGO init` / IMU crash	Restart or first execute `XGO init`
No scrolling content on LED	In `scroll text`, no `acceleration` is put in it	Check the block parameters
Only do half of the action	`wait` is too short	Set `wait` ≥ action duration
The entire program is lagging	Multiple long `wait` stacks	Replace the blocking `wait` with a timer