Prepare Sensor Mounts

The display, CO₂ sensor, and RGB LED are attached to the sensor mount. Later, it will be connected to the mainboard and tested.

First, attach the four middle spacers on the top side:

Next, you need 6 short spacers and attach them as follows on the same side of the PCB mount:

Now attach 5 short spacers on the underside:

Now attach the CO₂ sensor and the RGB LED to the underside:

Finally, attach the frosted plexiglass over the RGB LED on the top side and the display on the other end. Make sure the display is oriented correctly:

Your result should look like this: