> For the complete documentation index, see [llms.txt](https://docs.petoi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.petoi.com/petoi-robot-joint-index/joint-pins-on-biboard-v0/bittle-x.md).
# Bittle X
{% hint style="danger" %}
A servo plug has three wires. Plug it in the right direction or you may burn the chip. The color of wires may vary for different models. However, the darkest-colored (Black or Brown) wire (GND for ground) is always the GND wire as a convention. The GND wire should be plugged closest to the board.
{% endhint %}
{% hint style="danger" %}
The index number of the joint servo has **no corresponding relationship** with the PWM pin number on the main board. **You don't even need to read the pin numbers on the PCB board.**
{% endhint %}
---
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