8. Case 06: Trebuchet

8.1. Purpose


To build a trebuchet.

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8.2. Materials


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8.3. Background Knowledge


8.4. Bricks build-up


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A detailed assembly instruction can be downloaded via the below links: Githubdownload

8.5. Software


MicroSoftmakecode

8.6. Code


Step 1

Click “Advanced” in the MakeCode drawer to see more choices.

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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.

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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.

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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

You can also download it directly below:

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

8.7. Exploration


8.8. FAQ


8.9. Relevant File