Qwiic Shield for Arduino & Photon Hookup Guide
Englandsaurus 
Hardware Overview
Qwiic Shield for Arduino
The Qwiic Shields have 4x Qwiic connect ports, all on the same I2C bus. Logic level converters are included for the Qwiic connect port's SDA and SCL lines so you do not have to worry about using the Qwiic system with 5V (or 3.3V) devices.
In addition to this, a large prototyping area is included. As shown in the image below, the Qwiic shield for Arduino has a few neat features such as a few 3-by-1 rails to help with prototyping.
There are also buses for ground, 5V and 3.3V on the shield for Arduino outlined below.
The headers also allow for every pin on the microcontroller of your choice to still be accessed through the female headers.
Qwiic Shield for Photon
The Qwiic shield for the Particle Photon also includes 4x Qwiic connect ports, a prototyping area, and buses for 3.3V and ground. However, they are much smaller. The Photon is a 3.3V system and assumes that you are using 3.3V devices so logic level conversion is not included in the design. If you are using a 5V based I2C device, be sure to grab a bi-directional logic level converter.
