# 1 🧘‍♂️ Tools and Preparation

## 1.1 Preparation

Prepare a clean desk and some small boxes to unzip the package. Take a picture of the kit contents in case you lost something later. 

{% hint style="success" %}
It’s better to work in a room without carpet or textured mosaic. Little screws and springs can magically hide themselves if dropped onto the ground. 
{% endhint %}

## 1.2 Tools and accessories

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{% tab title="Required" %}

| **Tool**                                                                                             | **Notes**                                                                                                                                     |
| ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| Utility knife                                                                                        | Cut the tabs holding the wooden puzzle pieces                                                                                                 |
| Sanding paper/foam                                                                                   | Remove pointy fibers                                                                                                                          |
| Flat and Phillips screwdrivers                                                                       | For M2 (diameter = 2mm) screws                                                                                                                |
| A Windows/Mac/Linux Computer                                                                         | Install the latest [Arduino IDE](https://www.arduino.cc/en/Main/Software) or [the Desktop App](https://github.com/PetoiCamp/OpenCat/releases) |
| USB-microUSB or USB-TypeC cable                                                                      | Connect the uploader to the computer.                                                                                                         |
| [2 x 14500 3.7V Li-ion batteries](https://www.petoi.com/blogs/blog/recommended-batteries-for-nybble) | <p>Don’t mix with regular AA batteries (1.5V)! </p><p>The capacity should be around 800mAh. </p>                                              |
| Smart charger for batteries                                                                          | Wrong charger may cause danger!                                                                                                               |
| {% endtab %}                                                                                         |                                                                                                                                               |

{% tab title="Optional" %}

| **Tool**                      | **Note**                                                                                                                                       |
| ----------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| Soldering iron w/ accessories | [Solder the decorative LED to ultrasound sensor](https://github.com/PetoiCamp/OpenCat/blob/master/Resources/Nybble_SolderingUltrasound.pdf)    |
| HC-05 bluetooth module        | [Wirelessly upload sketch and communicate](https://www.petoi.com/forum/hardware/add-bluetooth-module-for-uploading-sketches-and-communication) |
| Color paints                  | Give your Nybble a unique look                                                                                                                 |
| 3D printer w/ accessories     | Add your special design                                                                                                                        |
| Arduino/Raspberry Pi kit      | Add more gadgets to Nybble                                                                                                                     |
| Multimeter                    | Test and debug                                                                                                                                 |
| Oscilloscope                  | Test and debug                                                                                                                                 |
| Hot glue/super glue           | Avoid using them. OpenCat is designed to be soft!                                                                                              |
| {% endtab %}                  |                                                                                                                                                |
| {% endtabs %}                 |                                                                                                                                                |