SparkFun's Qwiic Connect System uses 4-pin JST connectors to quickly interface development boards with sensors, LCDs, relays and more.See Qwiic Products
The Qwiic Connect System is designed to keep your projects moving.
Qwiic cables (4-pin JST) plug easily from development boards to sensors, shields, accessory boards and more, making easy work of setting up a new prototype.
There's no need to worry about accidentally swapping the SDA and SCL wires on your breadboard. The Qwiic connector is polarized so you know you’ll have it wired correctly every time, right from the start.
It’s time to leverage the power of the I2C bus! Most Qwiic boards will have two or more connectors on them, allowing multiple devices to be connected.
Our Qwiic line of products has grown to include powerful development boards, helpful shields, a vast array of sensors and much more.
Interfacing any microcontroller or development board with an I2C port will work with the Qwiic Connect System. Currently, we offer four easy-to-use shields:
For devices like the popular Arduino Pro Mini 3.3V and Teensy we recommend either cutting a Qwiic cable in two, or using the Qwiic Breadboard Cable and soldering the cable to the four spots on your development board.
We found it made more sense to solder four wires into place, rather than add 24 male pins and 24 female pins onto a shield that costs a bit of money as well.
Need more than one connection? Consider soldering four wires to a Qwiic Adapter. – you’ll have two Qwiic ports for less than $1.
Check below to answer any questions you may have about using the Qwiic Connect System.
The very conservative max current on a Qwiic cable is 226mA. If you want to push it, 28AWG is good for up to 1.4A for chassis wiring “isolated, unbundled wire in free air, as per the Handbook of Electronic Tables and Formulas for American Wire Gauge.” We wouldn’t recommend pushing the cables to 1.4A, but hundreds of mA should be fine.
All Qwiic cables have the following color scheme and arrangement:
We deliberately chose four conductors to increase usability of the interconnecting cables, minimize the cost of the connectors and limit the PCB footprint. All boards with extra pin options (such as interrupts, address selection, power save mode, etc.) will have those pins broken out to 0.1" holes, so the end user can add extra connections as needed.
I2C stands for inter-integrated circuit, and we’ve got a tutorial dedicated to it here. The bus was designed to communicate between ICs on a printed circuit board, so it wasn’t really designed to go long distances. That said, we’ve successfully communicated with sensors and boards via I2C over 1 meter (~4 ft).
The fastest and easiest way to extend the range of your I2C communication bus is to use the Differential I2C Breakout. The breakout uses NXP’s PCA9615 IC, which converts the two default I2C signals into four differential signals, two for SCL and two for SDA. The differential signals are sent over an Ethernet cable, which attaches to the breakout through the on-board RJ-45 connectors. The differential signaling allows the I2C signals to reach distances of up to 100ft while still maintaining their signal integrity!
Absolutely. We would be thrilled if you used a Qwiic connector on your board or product! You can use the name Qwiic without royalties or attribution.
The requirements to say that your board is Qwiic or Qwiic-Compatible:
We may implement a DC buck/boost board in the future, but for now Qwiic only supports 3.3V boards. Currently over 90 percent of our I2C products are 3.3V, and the technology market is accelerating this trend.
What if you already have a handful of SparkFun sensors and parts? We have been putting our standard GND/VCC/SDA/SCL pinout on all our I2C boards for many years. This makes it possible to attach a Qwiic Adapter that will get your SparkFun I2C sensor or actuator onto the Qwiic system.
Here is the list of the boards that have the standard I2C pinout and will work with the Qwiic adapter board:
Whether you are looking for help hooking up hardware, or you're just looking for project inspiration, take a look below. We are always trying to expand our library of projects and tutorials, so check back often or fill out the form above to be notified of new content.