# 2. Product installation

**Note: Peel the plastic film off the board first when installing the smart car.**

**Step 1 Mount the Bottom PCB**

Prepare the parts as follows:

1.  Gear Motor x4
2.  Fixed Part x4
3.  M3 Nickel Plated Nut x10
4.  3x6mm Round-head Screw x14
5.  4WD Bottom PCB x1
6.  Tracking Sensor x1
7.  Wheel x4
8.  5P Dupont Wire x1
9.  M3x40mm Copper Pillarx6
10.  M3x30m Round-head Screw x8
11.  M3x8mm Round-head Screw x2

![](media/image-20260224163221322.png)

![](media/image-20260224163229021.png)

![](media/image-20260224163234731.png)

![](media/image-20260224163243122.png)

![](media/image-20260224163252150.png)

![](media/image-20260224163300784.png)

**Step 2 Install Dot Matrix**

Prepare the parts as follows:

1.  8X16 LED Panel x1
2.  4WD Baffle
3.  4P Wire x1
4.  M2x8mm Round-head Screw x4
5.  M2 Nut x4

![](media/image-20260224163416348.png)

![](media/image-20260224163423301.png)

**Step 3  Install the Plastic Platform of Servo**

Prepare the parts as follows:

1.  Servo x1
2.  M2x4 Screw x1
3.  Black Cable Tiex2
4.  Ultrasonic Sensorx1
5.  Black Plastic Platform x1
6.  M1.2x4 Tapping Screw x4
7.  M2x8 Tapping Screw x2

![](media/image-20260224163515272.png)

You can find M1.2x4 screws inside the bag of the servo platform.

![](media/image-20260224163531100.png)

![](media/image-20260224163543219.png)

**Code for adjusting the servo**

To keep the servo motor at the correct angle, we need to upload the following code to the development board to adjust the servo's angle.

```c
/*
Set the 90-degree code,Copy the code and upload it to the development board. The steering gear connected to port D9 will rotate to 90 °
*/
#define servoPin 9 //servo Pin
int pos; //the angle variable of servo
int pulsewidth; // pulse width variable of servo

void setup() 
{
    pinMode(servoPin, OUTPUT); //set servo pin to OUTPUT
    procedure(0); //set the angle of servo to 0°
}

void loop() 
{
	procedure(90); // tell servo to go to position in variable 90°
}

// function to control servo
void procedure(int myangle) 
{
    pulsewidth = myangle x 11 + 500; //calculate the value of pulse width
    digitalWrite(servoPin,HIGH);
    delayMicroseconds(pulsewidth); //The duration of high level is pulse width
    digitalWrite(servoPin,LOW);
    delay((20 - pulsewidth / 1000)); // the cycle is 20ms, the low level last for the rest of time
}
```

![](media/image-20260224163754756.png)

![](media/image-20260224163956394.png)

**Step 4 Assemble Battery Holder**

Prepare the parts as follows:

1.  Top PCB x1
2.  M3 Nut x3
3.  Motor Driver Board x1
4.  Control Board x1
5.  IR Receiver Module x1
6.  M3x10mm Copper Pillar x8
7.  M3x8mm Round-head Screw x1
8.  M3x6mm Round-head Screw x16
9.  M3x10mm Flat-head Screw x2
10.  6 AA Battery Holder x1

![](media/image-20260224164112549.png)

![](media/image-20260224164119194.png)

![](media/image-20260224164126584.png)

![](media/image-20260224164136004.png)

![](media/image-20260224164141593.png)

**Step 5 Mount the Top PCB**

Prepare the parts as follows:

1. Bluetooth Module x1

2. M3x6MM Round-head Screw x6

3. Jumper Capx8

![](media/image-20260224164231752.png)

![](media/image-20260224164238537.png)

![](media/image-20260224164248355.png)

![](media/image-20260224164254499.png)

**Step 6 Hook-up Guide**

![](media/image-20260224164312241.png)

![](media/image-20260224164318324.png)

![](media/image-20260224164325228.png)

![](media/image-20260224164334963.png)

**Important reminder: Please unplug the Bluetooth module before starting the upcoming lessons; otherwise, the program upload will fail.**

![](media/image-20260225140858482.png)

![](media/image-20260224164508293.png)