Place the PCB back onto the front plate of the air quality monitor. Secure it with the three screws.
Add a small dot of hot glue to the top of the inside of the case, above the PM1006 sensor. Press the QT Py into the hot glue to secure it with the USB port facing out. This way if you need to adjust the code, you can still access the USB port.
If you ever want to remove the QT Py, you can use some isopropyl alcohol to remove the hot glue.
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