> For the complete documentation index, see [llms.txt](https://docs.ruuvi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ruuvi.com/ruuvi-hardware/ruuvi-connector-system/expansion-boards.md).

# Expansion boards

To make Ruuvi Connector System as flexible as possible, several adapter boards and standardised circuit boards will be made available.

### Standard expansion board dimensions

1. Small
2. Middle
3. Big

### External Ruuvi sensor boards

Various external Ruuvi Connector System compatible sensors are coming.

### Adapter boards

With Grove and Qwiic adapter boards you can connect almost any available sensor boards.