|Define Variable as the brightness value of the red light of the onboard LED.|
|Set the initial value of Variable as 0, and then the onboard LED is initially off.|
|Set the varied value of Variable and the brightness increases by 1 each time|
|Avoid excessively fast change of the red light. Wait to control its changing speed.|
|You can adjust the number “60” here and set the maximum brightness the onboard Led can achieve.|
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