# 3.31 Joystick Control Servo

## 3.31.1 Overview

We control the servo via the axis X of the joystick. This model is widely applied to mechanical ON/OFF of lights and doors.

## 3.31.2 Test Code

### 3.31.2.1 Code Flow

![6-31-3-1](./media/6-31-3-1.png)

### 3.31.2.2 Build Code

There are two ways to upload the code: directly open the code file we provide; or manually build blocks.

**Directly open the code file we provide:**

1. Click ![](./media/j68.png) and choose `Load from your computer`

![](./media/j67.png)

2. We have already downloaded the codes on computer desktop, so open the file and choose `3-31-remoteControlServo.sb3`

**Manually build blocks:**

1. Build the two basic blocks:![6-1-4-1-1](./media/6-1-4-1-1.png)
2. Declare a variable *angle* and assign the x value of joystick to *angle*.

![QQ_1722042398784](./media/6-31-3-2-1.png)

3. Add a ![j25](./media/j25.png) to determine whether *angle* > 3500. If yes, servo rotates to 0 degree.

![QQ_1722042751659](./media/6-31-3-2-2.png)

4. Add a ![j25](./media/j25.png) to determine whether *angle* < 500. If yes, servo rotates to 180 degree.

![image-20240727091322352](./media/6-31-3-2-3.png)

**Complete Test Code**

![QQ_1722040933018](./media/6-31-3-2-4.png)

### 3.31.2.3 Test Result

After uploading code, push the joystick to the left and the servo rotates to 180 degree. Push it to the right and the servo rotates to 0 degree.