The Adafruit Qwiic / STEMMA QT Breakout Board bridges the gap between the STEMMA QT / Qwiic connector world and standard 0.1" breadboard pins. One end has a JST SH-compatible connector for plug-and-play I2C, and the other has four 0.1" spaced pads for soldering headers or wires to a breadboard.

Built-in 10 K pull-up resistors on SDA and SCL keep your I2C bus tidy, and a green power LED confirms proper wiring. Use it with I2C controllers (Feather, Metro, QT Py) or I2C devices (sensors, OLEDs, GPIO expanders) — the lines pass straight through, so it works with both 3.3 V and 5 V logic.

Key Features

• STEMMA QT / Qwiic Connector – JST SH-compatible plug-and-play I2C port
• 0.1" Breakout Pads – Four pads (VCC, GND, SDA, SCL) for headers or wires
• 10 K Pull-Up Resistors – On SDA and SCL lines (can be disabled by cutting traces on the back)
• Power LED – Green indicator confirms power and ground are connected
• 3.3 V and 5 V Compatible – Passive pass-through works at either voltage level
• Bidirectional – Use as a controller-side or device-side breakout

Ideal For

• Connecting STEMMA QT / Qwiic devices to breadboards
• Adding a STEMMA QT port to boards without one
• Prototyping I2C circuits with standard 0.1" headers
• Quick I2C bus debugging and testing