## 3.2.7 Ferris Wheel

---------------

### 3.2.7.1 Overview

![Img](./media/top1.png)

Here we build a Ferris wheel with a Micro:bit V2 board, a servo expansion board, a 360° LEGO servo and some LEGO parts. We program to control the rotation of the Ferris wheel through the Micro:bit V2 buttons A and B.

![Img](./media/bottom1.png)

---------------

### 3.2.7.2 Materials Required

![Img](./media/A7-0.png)

---------------

### 3.2.7.3 Installation Steps

![Img](./media/2top.png)

![Img](./media/A7-1.png)

![Img](./media/A7-2.png)

![Img](./media/A7-3.png)

![Img](./media/A7-4.png)

![Img](./media/A7-5.png)

![Img](./media/A7-6.png)

![Img](./media/A7-7.png)

![Img](./media/A7-8.png)

![Img](./media/A7-9.png)

![Img](./media/A7-10.png)

![Img](./media/A7-11.png)

![Img](./media/A7-12.png)

![Img](./media/A7-13.png)

![Img](./media/A7-14.png)

![Img](./media/A7-15.png)

![Img](./media/A7-16.png)

![Img](./media/A7-17.png)

![Img](./media/A7-18.png)

![Img](./media/A7-19.png)

![Img](./media/A7-20.png)

![Img](./media/A7-21.png)

![Img](./media/A7-22.png)

![Img](./media/A7-23.png)

![Img](./media/A7-24.png)

![Img](./media/A07.png)

![Img](./media/wiring7.jpg)

![Img](./media/A7-25.png)

![Img](./media/A7-26.png)

![Img](./media/A7-27.png)

![Img](./media/A7-28.png)

![Img](./media/A7-29.png)

![Img](./media/A7-30.png)

![Img](./media/A7-31.png)

![Img](./media/A7-32.png)

![Img](./media/A7-33.png)

![Img](./media/A7-34.png)

![Img](./media/A7-35.png)

![Img](./media/A7-36.png)

![Img](./media/A7-37.png)

![Img](./media/A7-38.png)

![Img](./media/A7-39.png)

![Img](./media/A7-40.png)

![Img](./media/A7-41.png)

![Img](./media/A7-42.png)

![Img](./media/A7-43.png)

![Img](./media/A7-44.png)

![Img](./media/A7-45.png)

![Img](./media/2bottom.png)

---------------

### 3.2.7.4 Test Code

<span style="color: rgb(255, 76, 65);">The speed value 30 in the code can be adjusted appropriately according to your needs.</span>

![Img](./media/couj07.png)

⚠️ **<span style="color: rgb(255, 76, 65);">Special reminder: You can obtain the sample code through the following two methods.</span>**

#### **Method 1: drag and drop code blocks to build the sample code**

**1. MakeCode programming environment**

The online version of MakeCode: <u>[MakeCode editor](https://makecode.microbit.org/#editor)</u>

**2. MakeCode extension library**

⚠️ **<span style="color: rgb(255, 76, 65);">Special reminder: </span>** Copy and paste the link: `https://github.com/keyestudio2019/pxt-creative-inventors-kit-master.git` into the search box to import the library.

![Img](./media/Animation-4.gif)

**3. Write the sample code**

![Img](./media/dongtu-07.gif)

#### **Method 2: download the sample code file directly**

**1. Download the code file**

Click to download the code file: <u>[3_3_7_Ferris_Wheel](./Codes/3_3_7_Ferris_Wheel.hex)</u>

**2. MakeCode programming environment**

The online version of MakeCode: <u>[MakeCode editor](https://makecode.microbit.org/#editor)</u>

**3. Load the sample code**

Drag and drop the sample code to the MakeCode editor.

![Img](./media/Animation-0007.gif)

![Img](./media/line1.png)

---------------

### 3.2.7.5 Test Result

![Img](./media/4top.png)

Wire up and power on through Micro USB cable, and connect an external power source (four AAA-1.5V batteries installed in the battery box, ensuring sufficient power).

To download the sample code using an online browser, you need to send the downloaded "**.hex**" file to the Micro:bit V2 board. There are two ways as follows: 

**① Download through WebUSB**

For browsers like **Google Chrome / Microsoft Edge**, you need to click "**Connect Device**" to pair the device first. After that, click "**Download**" to load the sample code to the Micro:bit V2 board.

![Img](./media/Animation-07.gif)

**② Download without WebUSB**

For browsers like **Safari / Firefox / Other**, download and send the sample code to the Micro:bit V2 board.

![Img](./media/Animation-007.gif)

After downloading the sample code, unplug the Micro USB cable to the Micro:bit V2 board.

Turn the DIP switched to the RGB and ON.

![Img](./media/CBA01.png)

Press button A on the Micro:bit V2 board and release it, the Ferris wheel starts to turn, these SK6812 RGB LEDs emit colorful light, and the 5×5 LED matrix displays ![Img](./media/ab3.png).

Press button B on the Micro:bit V2 board and release it, the Ferris wheel stops, and these SK6812 RGB LEDs and the 5×5 LED matrix turn off.

![Img](./media/dongtu-007.gif)

![Img](./media/4bottom.png)

---------------