[Boson for micro:bit] The Bomb Escape 13
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LiLy Dec 03.2021
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STEP1: Connect the colorful LED strip to pin P0 of the expansion board.

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STEP2: Action Recognition

1.     Learn the related commands

Firstly, we need the micro: bit board to generate and display a direction randomly, then tilt the board, if the direction the board tilts to is same to the displayed direction, generate a new random direction, if not, micro: bit LEDs panel keeps displaying the current direction. The flow chart is shown as below:

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2. Programming

1)    Create a variable “target direction” to represent the arrow’s direction on micro: bit LED panel, set the variable value to “pick random 0 to 3”

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2)Create a function “generate a random direction”, and make the four numbers “0, 1, 2, 3” correspond to the four directions of the arrow displayed on the LED panel.

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3)Make a variable “operation direction” to represent the current direction the board tilts, and use it with “current gesture” to make the four “operation direction” correspond to the four numbers.

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4)Here we need to use a “if…then…else”. If the operation direction is same to the target direction, then continue to generate a new random direction.

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5)The whole program of this part is shown below:

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STEP3: LED Strip Countdown

1.    Draw a program flow chart

The LEDs on the LED strip will go off one by one as the time goes by. The faster you react; the more LEDs keep on at last.

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2.  Programming

1)    Create variables “time” and “the number of LEDs”, set “time” to 0, and set “the number of LEDs” to 7(means 7 LEDs keep on). Combine them with “if…then…else” to write the programs as the flow chart.

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2) Remember to set the LED’s lighting effect:

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3.  The whole programs of the last two parts:

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STEP4: Score System

1.     Draw the flow chart

If the operation direction is same as the target direction, then we get 1 point. If the number of LEDs (keep on) is over 0 when we got 20 points, we are the winner, the final score is the number of LEDs (keep on). Otherwise, we failed.

Here is the flow chart:

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2.  Programming

1)     Create variables “points” and “score”, set them to 0. Combine them with “if…then…else” function to meet the requirements of the flow chart.

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2)The final program is shown as below:

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