# Bittle X+Arm

{% hint style="info" %}
Bittle X+Arm is Bittle X equipped with a robotic arm.
{% endhint %}

The subpages mention the joint calibration interface for Bittle X+Arm, which uses BiBoard V0 and BiBoard V1 in the Petoi Desktop App.

## Prepare for calibration

This robotic arm is already fully assembled.

For the **pre-assembled** kit, install the neck servo in the servo slot using two M2 x 5 self-tapping screws. Then you can do the fine-tuning.

<figure><img src="https://docs.petoi.com/~gitbook/image?url=https%3A%2F%2F1565080149-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252F-MQ6a951Q6Jn1Zzt5Ajr-887967055%252Fuploads%252Ft8gnaABbmIwaMjHivgYX%252FNeck.jpeg%3Falt%3Dmedia%26token%3D83a08d4b-db61-4635-ac52-8c7a69d61d06&#x26;width=768&#x26;dpr=4&#x26;quality=100&#x26;sign=4addb956&#x26;sv=2" alt=""><figcaption><p>Install the robotic arm</p></figcaption></figure>

## Installation for the construction kit in the calibration state

For **the Construction kit**, after entering the calibration state, please install the neck servo and legs as follows:

#### Install the neck servo

{% hint style="warning" %}
Note: For **Bittle X+Arm**, there is no head component; only need to install the neck servo, which is in the head of Bittle X. So the installation is the same as [Bittle / Bittle X's](https://guide.petoi.com/desktop-app/joint-calibrator/bittle-bittle-x#install-the-head).
{% endhint %}

### Install the legs

The process is the same as [Bittle / Bittle X's](https://guide.petoi.com/desktop-app/joint-calibrator/bittle-bittle-x#install-the-legs).

### Install the robotic arm

The robotic arm installation of the construction kit is the same as the [pre-assembled kit](#prepare-for-calibration).

## Fine-tuning

### Bittle X+Arm's Calibration State

<figure><img src="https://docs.petoi.com/~gitbook/image?url=https%3A%2F%2F1565080149-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252F-MQ6a951Q6Jn1Zzt5Ajr-887967055%252Fuploads%252FPawv4zrrUnu0MKkRMmDF%252FrotationDirections.jpeg%3Falt%3Dmedia%26token%3D909a19fe-2ab3-467a-86be-8fb76691731b&#x26;width=768&#x26;dpr=4&#x26;quality=100&#x26;sign=fd852987&#x26;sv=2" alt=""><figcaption><p>Bittle X+Arm's Calibration State</p></figcaption></figure>

The process of fine-tuning the legs and the neck servo (**joint index 0**)  is the same as that of [Bittle / Bittle X's](https://guide.petoi.com/desktop-app/joint-calibrator/bittle-bittle-x#fine-tuning) (as above).&#x20;

Please click the blank part of the slider track and follow the calibration posture below to fine-tune **Servo 1** (**joint index 1**) on the robotic arm.

Please click the **Auto** button to fine-tune the claw servo (**joint index 2**) on the robotic arm.

You can also manually click the blank part of the corresponding slider track and adjust the gear on the servo output shaft to the position shown in the figure above.


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