Circuit Diagram
The diagram below provides a general visual reference for wiring the project's components. The project uses STEMMA QT cables and connectors to provide a no-soldering solution for wiring.
NOTE: The BME680 is shown on this diagram instead of the BME688. The wiring for both is identical.
Assembly
The Snap-on Enclosure for the Adafruit QT Py does a lot of heavy lifting for us as it provides a both enclosure for the QT Py and mounting rails for the display and the BME280 sensor .
Assemble the snap-enclosure frame. These parts should press-fit together.
Inside the frame, there are four mounting tabs for the QT Py. Take your QT Py and snap it into the bottom piece of the frame.
Then attach a STEMMA cable to the QT Py.
Before attaching the OLED and BME688 to the enclosure, you may want to route two STEMMA QT cables through the openings of the enclosure's front panel.
Route the cable connected to the QT Py through a row on the enclosure's bottom row. This cable will connect the QT Py to the BME688.
Route another QT Py cable through the same row, and then route it through a row towards the top. This cable will connect the BME688 to the OLED.
Push an 4mm screw through one of the BME688's mounting holes. Using a Philips-head screwdriver, screw it (on the other side) into a 20 x 6mm long F-F hex standoff.
Repeat this for the remaining 3 mounting holes.
Line the BME688 up with the front-panel. Make sure the stand-off's hole is lined up with the row.
Screw a 4mm screw through the back of the enclosure, into the standoff.
Repeat this for the remaining 3 screws.
Page last edited June 18, 2025
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