Qwiic Adapter Hookup Guide
There are a few things you should know about the Qwiic system before you go plugging in I2C devices willy nilly. The first thing to be aware of is that all Qwiic devices run on 3.3V. So if you have a 5V device and you are not using a stackable breakout board with a logic level converter (such as the Qwiic Shield for Arduino), you'll need to grab a logic level converter to boost your signals up to 5V. Also, be aware that all Qwiic devices have pull-up resistors on the I2C lines. So if your device does not have it, you'll need to add those in or use the ones on your microcontroller.
The Qwiic adapter is populated with two 4-pin 1mm JST connectors to quickly connect your I2C devices together. Four plated through holes are broken out for SCL, SDA, 3.3V, and GND. These pins can be used to convert an old I2C enabled device into a Qwiic enabled board.