Reference Guide

I2C Pin Out (STEMMA QT from Adafruit)

STEMMA QT is a connector system designed to simplify connecting sensors and other devices to microcontrollers and single-board computers. Used by Adafruit, STEMMA QT aims to streamline the process of prototyping and building electronics projects.

Do note that STEMMA AT, and STEMMA are both the same I2C connection standard, however they are different in size. STEMMA AT is smaller in size (1mm pitch), while STEMMA is easier to handle (2mm pitch).

I2C pinout for STEMMA QT from Adafruit

STEMMA QT connectors typically feature a standardized pinout, making it easy to plug and play with compatible devices. With STEMMA QT, you can quickly connect sensors, displays, actuators, and other peripherals without worrying about wiring configurations or compatibility issues.

One of the key advantages of STEMMA QT is its versatility. It’s compatible with a wide range of microcontrollers and single-board computers, including popular platforms like Arduino, Raspberry Pi, and Adafruit’s own CircuitPython boards. This compatibility makes it a convenient choice for makers and hobbyists working on diverse projects.

Overall, STEMMA QT provides a user-friendly interface for integrating sensors and devices into your electronics projects, allowing you to focus on experimentation and creativity rather than wrestling with wires and connectors. Whether you’re a beginner or an experienced maker, STEMMA QT can help streamline your prototyping process and bring your ideas to life.

The I2C cable connector from STEMMA QT (Adafruit) is compatible to qwIIC (Sparkfun Electronics). Their connector and the pin out are the same.

STEMMA QT I2C connector details

STEMMA QT I2C inter-connection system uses SH/SR series from JST. JST specialises in connector product. The following is the datasheet and drawing for the JST SH SR series connectors use.

Cable Plug

Housing part number: SHR-04V-S-B
– Available from Digikey: 455-1379-ND

Crimp Pin part number: SSH-003T
– Available from Digikey: 455-1561-2-ND

Board Socket

– Socket part number: BM04B-SRSS-TB (Available from Digikey: 455-BM04B-SRSS-TB)
– Socket part number: SM04B-SRSS-TB (Available from Digikey: 455-SM04B-SRSS-TB)

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I2C Pin Out (qwIIC from Sparkfun Electronics)

“qwIIC” (which stands for Quick Wire Inter-Integrated Circuit) from SparkFun Electronics is a convenient inter-board cable interface for connecting I2C electronic board modules together. I2C (Inter-Integrated Circuit) is a communication protocol commonly used to connect low-speed peripherals in embedded systems.

I2C pinout for qwIIC connect system from Sparkfun Electronics

The qwIIC system simplifies connecting I2C devices by providing a standardized pinout. This makes it easier to connect sensors, displays, memory modules, and other I2C-compatible components without having to worry about the specific pin configurations of each device.

Typically, the qwIIC pinout includes power (VCC and GND), clock (SCL), and data (SDA) lines, which are necessary for I2C communication. Some versions of qwIIC may also include additional pins for features like interrupt signals or voltage level shifting.

With qwIIC, you’ll spend less time figuring out pin configurations and more time creating awesome stuff. So, whether you’re a seasoned maker or just starting out, qwIIC is your trusty sidekick for hassle-free I2C interfacing.

Overall, the qwIIC pinout from SparkFun Electronics streamlines the process of connecting and interfacing with I2C devices, making it a popular choice for hobbyists, makers, and electronics enthusiasts.

The I2C cable connector from qwIIC (Sparkfun Electronics) is compatible to STEMMA QT (Adafruit). Their connector and pin out are the same.

QWIIC I2C connector details

QWIIC I2C inter-connection system uses miniature connector SH/SR series (1.0mm pitch) from JST. JST specialises in connector production. The following is the datasheet and drawing for the JST SH SR series connectors use in the QWIIC Connect System.

Cable Plug

Housing part number: SHR-04V-S-B
– Available from Digikey: 455-1379-ND

Crimp Pin part number: SSH-003T
– Available from Digikey: 455-1561-2-ND

Board Socket

– Socket part number: BM04B-SRSS-TB (Available from Digikey: 455-BM04B-SRSS-TB)
– Socket part number: SM04B-SRSS-TB (Available from Digikey: 455-SM04B-SRSS-TB)

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I2C Pin Out (Grove from Seeed Studio)

The Grove Ecosystem from Seeed Studio presents a revolutionary approach to prototyping electronic systems. It operates on a modular, standardized connector system base on I2C communication protocol, simplifying the process of introducing new electronics into the prototype design. Unlike conventional methods involving jumpers or soldering, Grove’s modular building-block strategy streamlines the process significantly.

This is the I2C pin out of a popular Grove from Seeed Studio. I2C cable is used for inter connecting the electronic circuit modules through this single data communication bus.

I2C pinout for Grove Ecosystem from Seeed Studio

The heart of the Grove system is its base unit, typically a microprocessor, facilitating seamless connections to various modules via this standardized I2C connector cables. The base unit acts as a central hub, allowing effortless integration of input and output from Grove modules. Each module serves a specific function, ranging from basic inputs like buttons to more intricate sensors like heart rate monitors. Importantly, the Grove ecosystem doesn’t mandate a base unit for module connectivity. A Grove to Pin Header Converter cable enables direct linkage from Raspberry Pi or Arduino pins to Grove connectors.

The Grove I2C cable interface enjoys compatibility with a wide range of development boards and microcontrollers, offering versatility and flexibility in project implementation.

Grove I2C connector details

Grove I2C inter-connection system uses its own proprietary connector. Known as 1125S-4P, or the A2005 series. The following is the datasheet and drawing for the Grove connectors.

Fortunately this connector can be compatible to Grove (Seeed Studio), and Gravity (DFRobot) which is base on JST PH series (2mm pitch) connector.

Cable Plug

Housing part number: PHB-4Y
Crimp Pin part number: PHB-T11

Grove 4pin assembled cable 5cm, 110990036 (Available from Digikey: 1597-1085-ND)
Grove 4pin assembled cable 20cm, 110990027 (Available from Digikey: 1597-1089-ND)
Grove 4pin assembled cable 30cm, 110990040 (Available from Digikey: 1597-1086-ND)
Grove 4pin female jumpers pack, 110990028 (Available from Digikey: 1597-1081-ND)

Board Socket

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