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Cables and Connector Systems

Guide to I²C cable standards, connector wiring order, and protection practices for reliable 3D-PAWS field deployments.

3D-PAWS uses modular I²C cabling systems to simplify wiring and improve reliability. Standardized connector systems such as Qwiic and Grove reduce assembly complexity and minimize wiring errors.

This page outlines the connector system, wiring convention, and field protection practices used in 3D-PAWS deployments.

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Connector System

Early builds used Qwiic cables (SparkFun). While they performed well, they are limited to shorter lengths (up to 50 cm) and the connectors can be damaged with repeated handling.

The current preferred system is Grove-compatible cabling manufactured by M5Stack, which provides:

  • Cable lengths up to 2 meters

  • More mechanically robust connectors

  • Improved suitability for field deployment

Unless otherwise specified, use the M5Stack (Grove-compatible) system.

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I²C Wiring Order

Both Qwiic and Grove systems use four conductors for the I²C communication protocol. Although the wire colors differ, the pin order is the same.

When viewing the connector with the open metal contacts facing down, the order from left to right is:

  1. Ground (GND)

  2. Power (VCC)

  3. Data (SDA)

  4. Clock (SCL)

Maintaining this order is critical for proper sensor communication.

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Color Differences

Qwiic (SparkFun)

  • Black

  • Red

  • Blue

  • Yellow

Grove (M5Stack)

  • Black

  • Red

  • Yellow

  • White

Because color conventions differ, this manual refers to the conductors as Jumper 1–4. Always verify orientation rather than relying only on color.

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Connector Protection

In field deployments, most communication issues are mechanical rather than electronic.

3D-PAWS systems use:

  • M5Stack connectors

  • A printed connector box

  • Integrated strain relief

Cables should not support their own weight or place tension on the connector. Once installed, connectors should not move within the enclosure.

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Corrosion Resistance

Outdoor deployments expose connectors to moisture and contaminants that can lead to corrosion.

To improve long-term reliability:

  • Route connectors into the printed connector box

  • Secure cables to prevent movement

  • After confirming correct operation, seal connections using:

    • Conformal coating, or

    • Hot glue

Hot glue is generally preferred when future serviceability may be required.

Proper cable routing, correct jumper order, and protected connectors significantly improve long-term system stability.

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