# Case 06: Trebuchet

## Purpose


To build a trebuchet.




![](./images/Ringbit_Bricks_Pack_case_en_06_01.png)


## Products Link

[ELECFREAKS micro:bit 6 IN 1 Ring:bit Kit](https://shop.elecfreaks.com/products/elecfreaks-micro-bit-6-in-1-ring-bit-kit-without-micro-bit-board?_pos=5&_sid=66ba68dec&_ss=r)


## Materials





![](./images/Ringbit_Bricks_Pack_case_en_06_02.png)



## Background Knowledge


## Bricks build-up





![](./images/Ringbit_Bricks_Pack_step_06_00.png)

![](./images/Ringbit_Bricks_Pack_step_06_01.png)

![](./images/Ringbit_Bricks_Pack_step_06_02.png)

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![](./images/Ringbit_Bricks_Pack_step_06_05.png)

![](./images/Ringbit_Bricks_Pack_step_06_06.png)

![](./images/Ringbit_Bricks_Pack_step_06_07.png)

![](./images/Ringbit_Bricks_Pack_step_06_08.png)

![](./images/Ringbit_Bricks_Pack_step_06_09.png)

![](./images/Ringbit_Bricks_Pack_step_06_10.png)

![](./images/Ringbit_Bricks_Pack_step_06_11.png)

![](./images/Ringbit_Bricks_Pack_step_06_12.png)

![](./images/Ringbit_Bricks_Pack_step_06_13.png)

![](./images/Ringbit_Bricks_Pack_step_06_14.png)

![](./images/Ringbit_Bricks_Pack_step_06_15.png)

![](./images/Ringbit_Bricks_Pack_step_06_16.png)

![](./images/Ringbit_Bricks_Pack_step_06_17.png)

![](./images/Ringbit_Bricks_Pack_step_06_18.png)

![](./images/Ringbit_Bricks_Pack_step_06_19.png)

![](./images/Ringbit_Bricks_Pack_step_06_20.png)

![](./images/Ringbit_Bricks_Pack_step_06_21.png)

![](./images/Ringbit_Bricks_Pack_step_06_22.png)

![](./images/Ringbit_Bricks_Pack_step_06_23.png)

![](./images/Ringbit_Bricks_Pack_step_06_24.png)

![](./images/Ringbit_Bricks_Pack_step_06_25.png)

![](./images/Ringbit_Bricks_Pack_step_06_26.png)

![](./images/Ringbit_Bricks_Pack_step_06_27.png)

![](./images/Ringbit_Bricks_Pack_step_06_28.png)

![](./images/Ringbit_Bricks_Pack_step_06_29.png)

![](./images/Ringbit_Bricks_Pack_step_06_30.png)

![](./images/Ringbit_Bricks_Pack_step_06_31.png)

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![](./images/Ringbit_Bricks_Pack_step_06_33.png)

![](./images/Ringbit_Bricks_Pack_step_06_34.png)

![](./images/Ringbit_Bricks_Pack_step_06_35.png)

![](./images/Ringbit_Bricks_Pack_step_06_36.png)

![](./images/Ringbit_Bricks_Pack_step_06_37.png)

![](./images/Ringbit_Bricks_Pack_step_06_38.png)

![](./images/Ringbit_Bricks_Pack_step_06_39.png)

![](./images/Ringbit_Bricks_Pack_step_06_40.png)

![](./images/Ringbit_Bricks_Pack_step_06_41.png)

![](./images/Ringbit_Bricks_Pack_step_06_42.png)

![](./images/Ringbit_Bricks_Pack_step_06_43.png)

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![](./images/Ringbit_Bricks_Pack_step_06_45.png)

![](./images/Ringbit_Bricks_Pack_step_06_46.png)

![](./images/Ringbit_Bricks_Pack_step_06_47.png)

A detailed assembly instruction can be downloaded via the below links:
[Githubdownload ](https://github.com/elecfreaks/learn-cn/raw/master/microbitKit/ring_bit_bricks_pack/files/Ringbit_Bricks_Pack_step_06_v1.1.pdf)


## Software


[MicroSoftmakecode](https://makecode.microbit.org/#)

## Code


### Step 1
 Click "Advanced" in the MakeCode drawer to see more choices.






![](./images/Ringbit_Bricks_Pack_case_en_06_03.png)



In order to programme for the Ring:bit Bricks Pack, we need to add an extension. Click  "Extensions" at the bottom of the drawer. Search "servo" in the dialogue box to download it. 




![](./images/Ringbit_Bricks_Pack_case_en_06_04.png)


***Note:*** If you met a tip indicating codebase will be deleted due to incompatibility, you may continue as the tips tell or build a new project.

### Step 2

While button A being pressed, set the servo connected to P1 port turning 180 degrees and pause 300ms;  then set the same port turning 90 degrees and pause 1000ms; set the servo connected to P2 turning 0 degree and pause 1000ms; then the same port turning 90 degrees and pause 1000ms;  P1 turning 0 degree and pause 300ms; then the same port turning 90 degrees and pause 500ms; P2 turning 180 degrees and pause 1000ms and the same port turning 90 degrees and pause 1600ms. 



![](./images/Ringbit_Bricks_Pack_case_en_06_05.png)




***Note:*** As the servo we used is in 360 degrees, the "servo" extension in MakeCode is suitable for servos in 180 degrees, therefore, setting the turning angle to 0 degree or 180 degrees will lead to the servo turning clockwisely or anti-clockwisely, and 90 degrees means to stop turning.

### Code

Link: [https://makecode.microbit.org/_AM7FejLdJD2m](https://makecode.microbit.org/_AM7FejLdJD2m)

You can also download it directly below:

<div style="position:relative;height:0;padding-bottom:70%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/#pub:_AM7FejLdJD2m]" frameborder="0" sandbox="allow-popups allow-forms allow-scripts allow-same-origin"></iframe></div>  

### Result

While button A being pressed, the trebuchet executes the launch order and will return to its original launch status automatically. 

## Exploration



## FAQ



## Relevant File