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Qwiic (formerly easyC)

What's Qwiic?​

Qwiic is a solder-free, plug-and-play connection system designed for I2C communication between microcontroller boards, sensors, and actuators. With Qwiic, you can focus on coding and prototyping without dealing with messy wiring or soldering.

  • You can chain multiple devices together without extra wiring.
  • The polarized connectors prevent incorrect connections, so you never mix up VCC/GND or SDA/SCL.
  • Since Qwiic (formerly easyC) is based on I2C, multiple sensors and modules can be connected to a single microcontroller (daisy chain), simplifying wiring for complex projects.
  • Works with any board that has a Qwiic connector, including all Dasduino boards. If your board doesn’t have a Qwiic connector, you can use an adapter to convert standard pin headers into a Qwiic cable.

Name Change​

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EasyC was our original name for this connector system, but we are now transitioning to Qwiic. Functionally, easyC and Qwiic are the same. Both use the JST-SH 4-pin connector (1.00mm pitch) and are fully compatible with:

  • SparkFun Qwiic
  • Soldered easyC
  • Adafruit STEMMA QT

Hardware Details​

The 4-pin Qwiic cable follows this standard color coding:

ColorFunction
BlackGND (Ground)
Red5V / 3V3 (Power)
BlueSDA (I2C Data)
YellowSCL (I2C Clock)
Qwiic connector closeup
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Find the mechanical drawing of the female connector here and the male connector on the cable here.
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Qwiic-compatible boards by Soldered always have a voltage regulator onboard, which means you can connect any Qwiic breakout to boards with 5V or 3V3 logic level!
Qwiic cable

Qwiic cable

Qwiic (formerly easyC) compatible cables with connectors on both ends, available in various lengths.
Qwiic adapter

Qwiic adapter

Qwiic (formerly easyC) adapter to turn a header pin connection into two female Qwiic ports.
Qwiic Raspberry Pi adapter

Qwiic Raspberry Pi adapter

Qwiic (formerly easyC) adapter to extend Raspberry Pi's onboard header pins into a female Qwiic port.