I2C Pin Out (Breakout Garden from Pimoroni)

I2C socket pin out Breakout Garden from Pimoroni

Breakout Garden Introduction

Breakout Garden – Effortless I²C Expansion
Breakout Garden by Pimoroni makes it incredibly simple to add sensors, displays, and drivers to your Raspberry Pi. No soldering, no breadboards — just plug a breakout board into a slot and start experimenting.


What is Breakout Garden?

Breakout Garden is a plug-and-play hardware ecosystem built around the I²C bus. Instead of wiring up pins manually, you just insert a breakout board into a slot with a standard pinout.

  • Designed for Raspberry Pi (HATs and pHATs available)
  • Uses I²C and SPI slots (today we’ll focus on I²C)
  • Slots are keyed, so you can’t plug things in the wrong way
  • Compatible with dozens of Pimoroni breakout boards

Breakout Garden I²C Pinout

Each I²C slot on Breakout Garden uses a 5-pin connector arranged as:

  • Pin 1 – 3V3 Power
  • Pin 2 – SDA (I²C Data)
  • Pin 3 – SCL (I²C Clock)
  • Pin 4 – INT (Interrupt / Optional)
  • Pin 5 – GND (Ground)

Tip: Most I²C breakouts only use the four pins (3V3, SDA, SCL, GND). The INT pin is for boards that need interrupt signalling (e.g., IMU sensors). The keyed socket ensures you can’t insert a board backwards — it’s foolproof I²C expansion.


Why Breakout Garden?

  • 🌱 No soldering – boards just slot in
  • 🌱 Foolproof design – keyed connectors prevent mistakes
  • 🌱 Hot-swappable – swap sensors without rebooting
  • 🌱 Huge ecosystem – dozens of Pimoroni breakouts ready to go

Breakout Garden connector details

The Breakout Garden socket is a 5-pin female connector designed for plug-and-play breakouts.

The sockets are 0.1″ pitch, 5 pin connectors for their Breakout Garden slots.

Socket

Breakout Garden Socket

Edge Connector

Breakout Garden Edge Connector

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I2C Pin Out (from DFRobot Gravity)


The DFRobot Gravity Series stands as a premium open-source electronics toolkit, designed to be modular, plug-and-play, and accessible to all. Featuring robust expansion shields, a diverse array of professional-grade functional modules boasting standard interfaces, and comprehensive documentation, the Gravity Series empowers users of any expertise level to effortlessly connect and combine components, bringing their ideas to life or advancing their projects with ease.

I2C connector pinout for DFRobot Gravity

The I2C cable used for Gravity (DFRobot) is the same connector used for Grove (Seeed Studio) and Stemma (Adafruit), but however the pin out wiring is not the same. So while you can use the I2C cable, but you cannot mixed and inter-connect Gravity electronic board with the other brands. An adaptor cable is needed to do the signal line conversion.

Gravity I2C connector details

Gravity I2C inter-connection system uses PH series from JST. JST specialises in connector product. The following is the datasheet and drawing for the JST PH series connectors use.

Cable Plug

Housing part number: PHR-4
– Available from Digikey: 455-1164-ND

Crimp Pin part number: SPH-002T
– Available from Digikey: 455-1127

Board Socket

– Socket part number: B4B-PH-K-S (Available from Digikey: 455-1706-ND)
– Socket part number: S4B-PH-K-S (Available from Digikey: 455-1721-ND)

Tools Accessories

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Other I2C Connector Standard.

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I2C Pin Out (from nodeLynk)

I2C connector pinout of nodeLynk

nodeLynk Introduction

nodeLynk™ – Plug-and-Play I²C Expansion
Simplify your hardware projects with nodeLynk, the universal I²C bus standard from NCD.
Connect sensors, relays, and controllers in seconds—no soldering, no guesswork.

👉 Just plug in. Start building.


What is nodeLynk?

nodeLynk is a physical I²C expansion standard designed to make prototyping and production easier.

  • Uses standard I²C protocol (no special firmware required)
  • Built on a 4-pin keyed Molex SL connector
  • Supports plug-and-play sensors, relays, and modules
  • Chainable – daisy-chain multiple modules with one host controller

Whether you’re using Arduino, Raspberry Pi, Particle, ESP32, or other microcontrollers, nodeLynk lets you skip the breadboard mess and get straight to building.


nodeLynk Pinout

Every nodeLynk connector has four pins in a fixed order:

  • Pin 1 – GND (Ground)
  • Pin 2 – VCC (5V)
  • Pin 3 – SDA (I²C Serial Data)
  • Pin 4 – SCL (I²C Serial Clock)

⚠️ Note: nodeLynk uses 5V I²C. If your controller runs at 3.3V (e.g. Raspberry Pi, ESP32), use a level-shifting adapter.
The pin order is always consistent, so nodeLynk cables work interchangeably across all devices.


Color code illustration.

Imagine a simple 4-pin connector illustration, left-to-right:

  • Brown → GND
  • Red → VCC (5V)
  • Orange → SDA
  • Yellow → SCL

Why Choose nodeLynk?

  • Plug-and-Play – Skip wiring headaches with standard cables
  • Universal – Works with hundreds of I²C modules
  • Chainable – Add multiple devices on one bus
  • Reliable – Keyed connectors prevent wiring mistakes

nodeLynk I2C connector detail

Cable Plug

Molex plug 50579404 (pdf 0.15MB)

Board Socket

Molex socket 0705530003 (pdf 0.25MB)

nodeLynk Pinout

nodeLynk connector pinout

Check out our best seller general purpose Cable Tester tool.

Other I2C Connector Standard.

You may also be interested in other i2c connector standard available on the market. Click here.

Various i2c connector on the market