# 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 **construction** kit\
  Install the short wire servo in the servo slot on the robotic arm with two M2\*5 self-tapping screws. \
  \[robotic arm installation image 0]
* For the **pre-assembled** kit

  &#x20;You only need to install the servo with the neck structure in the servo slot with two M2\*5 self-tapping screws.<br>

  <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></figcaption></figure>

## Installation for the construction kit in the calibration state

For the construction kit, after entering the calibration state, please install the legs and robotic arm as follows:

### Install the legs

The process is the same as [Bittle / Bittle X's](https://app.gitbook.com/o/-M-_eWZUjFA4usjshHcZ/s/-MQ6a951Q6Jn1Zzt5Ajr-887967055/~/changes/650/desktop-app/joint-calibrator/bittle-bittle-x/~/overview#install-the-legs).

### Install the robotic arm

Place the robotic arm as close to the central axis as possible and insert its servo shaft into the servo arm of the neck.

\[robotic arm installation image 1]

Press down on the robotic arm so it is firmly attached to the neck.

\[robotic arm installation image 2]

## Fine-tuning

The process of fine-tuning the legs and the Servo 0  is the same as that of Bittle / Bittle Xegs process is the same as [Bittle / Bittle X's](https://app.gitbook.com/o/-M-_eWZUjFA4usjshHcZ/s/-MQ6a951Q6Jn1Zzt5Ajr-887967055/~/changes/650/desktop-app/joint-calibrator/bittle-bittle-x#fine-tuning).

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

Please click the Auto button to fine-tune the claw (Servo 2) on the robotic arm.

<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></figcaption></figure>

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.