> For the complete documentation index, see [llms.txt](https://docs.auterion.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.auterion.com/hardware-integration/airframe-integration/wiring-without-breakout-boards.md).

# Wiring without Breakout Boards

The breakout boards shipped with the [Evaluation Kit](/hardware-integration/skynode/evaluation-kit.md) offer flexibility during exploration and prototype phase. For a tighter hardware integration, devices can be wired directly to the Pico-Clasp connectors on Skynode such that the breakout boards become obsolete.

## Required tools

* [Molex Pico-Clasp connectors](https://www.digikey.com/en/products/detail/molex/5011894010/1531524?s=N4IgjCBcoBw1oDGUBmBDANgZwKYBoQB7KAbRACYwwA2AVggF0CAHAFyhAGVWAnASwB2AcxABfUQXKkQAW0IYcADwAEzPokLLEGNFmYgGooA)
* [Pico-Clasp crimp tool](https://www.digikey.com/en/products/detail/molex/0638191500/1832244)
* [Pico-Clasp crimp contacts](https://www.digikey.com/en/products/detail/molex/5013340100/1531513)
* Alternatively [Pre-crimped Pico-Clasp cables](https://www.digikey.com/en/products/detail/molex/0797581017/6564342)

![](/files/tYlsLgFJk8vQhxUZGDTs)

## Schematic

{% file src="/files/jSzbFD2a34tpt6ZgDAeK" %}
Skynode Pico-Clasp Pinout
{% endfile %}

## Wiring Devices to the Pico-Clasp Connectors

### Example: Freefly RTK GPS module

| Pin # on GPS JST Connector |    Signal   | Pin # on Pico-Clasp Primary (J4) |
| :------------------------: | :---------: | :------------------------------: |
|              1             |   VCC\_5V   |               22 \*              |
|              2             |   GPS\_RX   |                18                |
|              3             |   GPS\_TX   |                20                |
|              4             |   I2C\_SCL  |                19                |
|              5             |   I2C\_SDA  |                21                |
|              6             |    BUTTON   |                 3                |
|              7             | BUTTON\_LED |                 5                |
|              8             |     GND     |               7 \*               |

*\*There are also other options to chose here as those signals appear multiple times on the Pico-Clasp connector J4. Make sure to use the correct supply voltage for your peripheral. For the GPS this would be VDD\_5V\_CAN1\_GPS1 (pin 22 or 40). For other peripherals check the Datasheet under "Peripheral Power Domains".*

![Crimp the ends of the GPS cable](/files/ax5I0RgGYq7gP5LMla5g)

![Insert the crimped ends to the correct positions on the Picoclasp connector](/files/FxF4kHvIECS4fcetHcTH)

{% hint style="info" %}
The I2C pins exist only once one each Pico-Clasp connector. If you would like to connect multiple I2C devices on the same I2C bus you can split the I2C line using a Y-cable
{% endhint %}