Keyestudio 4WD Manual page 111

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"on start": command block runs once
to start program.
Turn on LED dot matrix
Set the initial value of item to 0
Press button A on Micro:bit board
Change item by 5
Press button B on Micro:bit board
Change item by -5
The program under the block "forever"
runs cyclically.Light on LED in dot
matric to draw bar graph, light up up to
25 LEDs
If item is greater than 25
Then set item to 25
If item is less than 0
Then set item to 0
Click"JavaScript" to switch into JavaScript code:
111