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Qwiic is SparkFun’s 4-pin JST-SH (1.0mm) I2C plug-and-play ecosystem (also compatible with STEMMA QT). Here are the most useful picks depending on what you’re trying to do:

Get started (cables/adapters)

• If you want a variety of cable lengths in one go: SparkFun Qwiic Cable Kit ($29.75)
• To convert a classic I2C breakout to Qwiic: SparkFun Qwiic Adapter ($3.25)

Add more Qwiic ports (hubs/splitters)

• Simple way to add extra ports to a single-connector board: SparkFun Qwiic MultiPort ($5.05)
• Star-style hub with 4 extra Qwiic ports: Qwiic MultiStar Constellation Ornament ($11.05)
• Compact splitter for up to 5 ports (Qwiic/STEMMA QT): Adafruit Qwiic / Stemma QT 5 Port Hub ($5.30)

Bridge to other connector ecosystems

• Qwiic to Grove adapter cable: Qwiic Cable - Grove Adapter (150mm) ($4.95)
• Grove/STEMMA to Qwiic/STEMMA QT JST-SH adapter: 4-pin JST PH to JST SH Cable - STEMMA / Grove to QT / Qwiic - 200mm long ($2.15)
• Another Grove-to-Qwiic cable option: Grove to STEMMA QT / Qwiic / JST SH Cable - 100mm long ($4.15)
• Longer Qwiic-to-STEMMA cable: Flexible Qwiic to STEMMA Cable - 500mm ($7.10)

Add Qwiic to Raspberry Pi / Arduino / Feather-style boards

• Raspberry Pi add-on with Qwiic ports: SparkFun Qwiic HAT for Raspberry Pi ($13.35)
• Minimal Pi option to add a single connector: SparkFun Qwiic SHIM for Raspberry Pi ($3.55)
• Arduino shield for Qwiic I2C: SparkFun Qwiic Shield for Arduino ($16.50)
• Feather/Thing Plus connector add-on: SparkFun Qwiic / Stemma QT FeatherWing (Shield for Thing Plus) ($14.15)
• Pi starter bundle: SparkFun Qwiic Kit for Raspberry Pi ($121.35)

Popular Qwiic devices (examples)

• Sensor for gardening/projects: Qwiic Soil Moisture Sensor ($12.90)
• Easy numeric/text output: Qwiic Alphanumeric Display - Blue ($20.20)
• Sharp 128x128 OLED UI: Qwiic OLED Display - 1.5in 128x128 ($58.90)
• Environmental sensing: SparkFun Atmospheric Sensor Breakout - BME280 (Qwiic) ($34.25) or SparkFun Environmental Sensor Breakout - BME680 (Qwiic) ($46.50)
• Advanced colour/light measurement: AS7343 Qwiic Spectral Sensor ($43.20)

Control / logging / input over I2C

• Switch loads via I2C relay: Qwiic Relay - 1x1A DPDT ($18.35)
• Log data to microSD over I2C: SparkFun Qwiic OpenLog ($42.30)
• Rotary encoder input with RGB: SparkFun Qwiic Twist - RGB Rotary Encoder Breakout ($51.60)
• I2C motor control: SparkFun Qwiic Motor Driver ($48.10)