# Upgrade your older Bittle/Bittle X for the robotics arm gripper

The older Bittle/Bittle X models have different hardware configurations. The following table shows what components need to be upgraded for different models to work with [Bittle robotic arm gripper extension kit with alloy servos](https://www.petoi.com/products/bittle-arm-extension-with-metal-servos):

* <mark style="color:red;">A red color</mark> means the part must be upgraded
* <mark style="color:green;">A green color</mark> means the part can be reused.&#x20;
* <mark style="color:blue;">A blue color</mark> indicates that the board's wiring and other configurations must be adjusted.&#x20;

<table><thead><tr><th width="169.29296875"></th><th width="143.375">Current board</th><th>Current servos</th><th>You need these for the upgrades</th></tr></thead><tbody><tr><td><strong>Bittle X V2</strong></td><td><mark style="color:green;">BiBoard V1</mark></td><td><mark style="color:green;">Feedback alloy  servos</mark></td><td>N/A</td></tr><tr><td>Bittle Robotics kit</td><td><mark style="color:red;">NyBoard</mark></td><td><mark style="color:green;">Alloy servos</mark></td><td>BiBoard V1</td></tr><tr><td>Bittle STEM kit</td><td><mark style="color:red;">NyBoard</mark></td><td><mark style="color:red;">Lite(plastic) servos</mark></td><td>BiBoard V1 + alloy servos(with or without feedback)</td></tr><tr><td>Bittle X</td><td><mark style="color:blue;">BiBoard V0</mark></td><td><mark style="color:red;">Lite(plastic) servos</mark></td><td>Alloy servos(with or without feedback)</td></tr></tbody></table>

The simplest solution is to buy the newest components to match the Bittle X+Arm configuration. We offer discounted combo kits to help you upgrade.  You can [contact us](https://www.petoi.com/pages/contact-us) to get the discount.

The following instructions will guide you in reconfiguring the BiBoard V0 for the Arm. **You must complete all the following steps.**

## 1. BiBoard V0 Re-configuration

The arm's alloy servos require much more current. To bypass the fuse (marked X30 or X70), you must directly solder its two ends.

<figure><img src="/files/dTjDZKABFN7ihp80biWp" alt=""><figcaption></figcaption></figure>

## 2. Firmware

### You will need to upgrade the firmware via Firmware Uploader with the following option:

Model: **Bittle X+Arm**

Board: **BiBoard V0\_\***  (Select the corresponding option based on the robot's mainboard model)

Mode: **Standard**<br>

<figure><img src="/files/F9Jb5weNZgshxOQwRBXb" alt=""><figcaption></figcaption></figure>

### Or via Arduino IDE with the following macro activated:

{% code overflow="wrap" %}

```cpp
#define BITTLE
#define BiBoard_V0_*  // Activate the corresponding macro definition statements in the code based on the actual mainboard model the robot uses.
#define ROBOT_ARM
```

{% endcode %}

<figure><img src="/files/TpVRQobJrFuORKHKecem" alt=""><figcaption></figcaption></figure>

## 3. Wiring

Please refer to the wiring diagram to attach the robotic arm。<br>

<figure><img src="/files/tG2pRL7ynUo6evGmkTmY" alt=""><figcaption></figcaption></figure>

## 4. Calibration

The robot arm needs to be calibrated to work correctly. Please refer to the [corresponding chapter](https://guide.petoi.com/product/bittle-x-v2+arm/control-and-program/petoi-desktop-app/joint-calibrator) for details.&#x20;

## 5. Controller

We have the [Micro:Bit controller](https://guide.petoi.com/extensible-modules/joystick-with-micro-bit) to provide an intuitive and prompt control for the robot.


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