## 2. Product installation

When all the components have been counted well, do you cannot wait to assemble it? Woah, in the following let’s begin to assemble this smart car together, so try to experience the fun of DIY. Follow the assembly steps here to build your own robot, believe it or not, you will be full of delight and get a great sense of achievement. If still confused, you can also refer to our assembly video for this smart car.

(1) Begin with the bottom parts, you should hook up two motors on the acrylic board. How to get started with?

Firstly, you should prepare the components as follows:

- M2 Nut *2
- White N20 motor holder *2
- 12FN20 motor connector *2
- M2*10MM round-head screw *4 
- Acrylic bottom board *1
- 2P 160mm red-black connector wire *2

![](media/image-20251218135759244.png)

Okay, place four M2 Nuts inside the holes of white N20 motor holders. You should get it as below.

![](media/image-20251218135813890.png)

After that, place the white N20 holders onto the motors.

![](media/image-20251218135826145.png)

Then fix these two 12FN20 motor connectors on the back of acrylic bottom board with four M2*10MM round-head screws.

![](media/image-20251218135839546.png)

![](media/image-20251218135847669.png)

Here you should connect two pieces of **2P160mm red-black connector wire** to the 12FN20 motor connectors. Shown below.

![](media/image-20251218135922506.png)

(2) Next, mount the battery case on the acrylic bottom board. Here you can choose the 18650 2-cell battery case or 4-cell AA battery case. Here we install the 18650 2-cell battery case for the smart car. So we will take the smart car installed with 18650 battery case as example to start the following project sections. You should first get some parts below:

- Battery case*1
- M3*8MM flat-head screws *2
- M3 Nut *2

![](media/image-20251218140003959.png)

![](media/image-20251218140013154.png)

Then fix well the battery case on the top of Acrylic board using two M3*8MM flat-head screws and two M3 Nuts. 

![](media/image-20251218140031753.png)

If you would like to install the 4-cell AA battery case, you can refer to below.

- 4-cell Battery case*1
- M3*8MM flat-head screws *2
- M3 Nut *2

![](media/image-20251218140121925.png)

Install the 4-cell AA battery case on the top of Acrylic board with two M3*8MM flat-head screws and two M3 Nuts.

![](media/image-20251218140143934.png)

![](media/image-20251218140150955.png)

(3) Followed by assembling the line tracking sensor, you should get these components as follows:

- Line tracking sensor *1
- M3 Nut *2
- M3*5+5MM single-pass copper pillars *2
- M3*6MM round-head screws *2
- 5P 15CM blue-green-yellow-red-black connector wire *1

![](media/image-20251218140230187.png)

Prepared well the components above, let's first insert two M3*5+5MM single-pass copper pillars into the holes on the tracking sensor, then tighten two M3 Nuts on the copper pillars. Shown below.

![](media/image-20251218140247557.png)

Installed well, you should see the details of tracking sensor as below:

![](media/image-20251218140304561.png)

After that, mount the tracking sensor on the red holes circled on the Acrylic board with two M3*6MM round-head screws. Shown below.

![](media/image-20251218140320835.png)

For easy wiring, here you should connect a **5P** **15CM** **blue-green-yellow-red-black** **connector wire** to the connector of tracking sensor. Shown as below.

![](media/image-20251218140348562.png)

(4) Completed the above assembly, let's install the wheels for this small car. 

- W420 ball caster wheel *1
- M3*10MM round-head screws *2
- M3 Nut *2
- Plastic wheel *2

![](media/image-20251218140646465.png)

First of all, fix the W420 ball caster wheel on the Acrylic bottom board with two M3*10MM round-head screws and two M3 Nuts.

![](media/image-20251218140720142.png)

You can get the view as below: 

![](media/image-20251218140731896.png)

Then, plug two small wheels into the two motors.

![](media/image-20251218140743200.png)

And you should get the view as follows:

![](media/image-20251218140754523.png)

Finally, put those wires on the back through the holes on the acrylic board. 

![](media/image-20251218140808399.png)

(5) Installed well the bottom part, now let's move on to the top part of this smart car.

First step you should get ready for these components mentioned below.

- M3*40MM dual-pass copper pillars * 4
- M3*6MM round-head screws *4

For the four holes circled on acrylic bottom board, screw down four M3 * 40MM dual-pass copper pillars on four M3 * 6MM round-head screws.

![](media/image-20251218140850212.png)

Finally, you should view it as below:

![](media/image-20251218140903873.png)

(6) Pretty good. Okay, now you should install the particular eyes for this smart car, i.e. Ultrasonic module.

- Ultrasonic module *1
- M3*10MM round-head screw *4
- M3 Nut *4
- Small acrylic board *1
- 4P 8CM connector wire *1 

![](media/image-20251218141024604.png)

Look at the figure below, fix the ultrasonic module on the acrylic board with four M3*10MM round-head screws and four M3 Nuts.

![](media/image-20251218141039120.png)

For easy wiring, then you should connect the **4P 8CM connector wire** to ultrasonic module.

![](media/image-20251218141057560.png)

(7) After that, you should fix other sensors on the acrylic top board. Prepare well several parts as follows:

- Acrylic top board *1
- Obstacle detector sensor *2
- IR receiver sensor *1
- M3*10MM round-head screw *3
- M3 Nut *7
- M3*8+6MM single-pass copper pillar *4

![](media/image-20251218141134897.png)

For those holes circled on the acrylic top board, separately mount two obstacle detector sensors and an IR receiver sensor on it with three M3*10MM screws and three M3 Nuts. 

![](media/image-20251218141148153.png)

Please refer to the photos shown as below:

![](media/wps1.png)

Then, fix four M3*8+6MM single-pass copper pillars and four M3 Nuts on the acrylic top board as well.

![](media/image-20251218141219507.png)

Finished with the above assembly, you should get the correct view shown as below.

![](media/wps2.png)

(8) Until now, you should get all the assembled parts shown below. And prepare four M3*6MM round-head screws to assemble them together.

![](media/image-20251218141254497.png)

Firstly, insert the ultrasonic module into the two holes of acrylic bottom board. Shown below.

![](media/image-20251218141308297.png)

Then, screw down the acrylic top board onto the copper pillars with four M3*6MM round-head screws. See the red circle.

![](media/image-20251218141321256.png)

For easy wiring, here you should connect each **8CM 3P connector wire** to two obstacle detector sensors and an IR receiver sensor. And put those connector wires through the holes on the acrylic top board.

![](media/image-20251218141351235.png)

（9）Wow, the smart car is almost installed well as yet. The next step is to install the control board as follows.

- UNO R3 main board *1
- Motor drive shield *1
- Bluetooth module*1
- M3*6MM round-head screw *4

![](media/image-20251218141544900.png)

First, place the UNO R3 main board onto the acrylic top board, pay attention to the fixed holes (red circle).

![](media/image-20251218141602937.png)

Then screw down the board with four M3*6MM round-head screws. Shown below.

![](media/image-20251218141618697.png)

After that, stack the motor drive shield onto UNO R3 main control board.

![](media/image-20251218141630502.png)

Up to now, you have installed well the hardware of this smart car. Congrats! Okay, the final step here is to connect well all the connector wires.

(10) For the wiring, you can connect them according to the corresponding silk-screen on the board. 

Or you can refer to the **connection diagram** as below.

![](media/image-20251218141709572.png)

All connector wires are connected well as the photos shown below.

![](media/wps3.png)

Finally, plug keyestudio Bluetooth HC-06 module onto the motor drive shield. Pay more attention to the connection direction.

![](media/image-20251218141740046.png)

So far, this smart car is wholly installed well. Congrats!

![](media/image-20251218141757688.png)

In the following section, everyone can follow our step-by-step learning process to make the little guy move in accordance with the instructions, so that complete a variety of fancy motions.