Assembling the HALO
Follow these instructions step-by-step to assemble your Halo AQI Monitor. Be precise and careful to ensure proper functionality.
- Secure the three side ventilation grills to the main shell and the top mesh to the cap using superglue.
- Apply a moderate amount of superglue to avoid overflow that could damage the outer surface. Allow the glue to dry fully before proceeding.
- Use a soldering iron set to a moderate temperature (~500°F) to install six M2 thermal inserts into the designated slots in the shell.
- Ensure the inserts are flush with the surface for a secure fit.
- Align the components and assemble the shell, light diffuser, and cap using six M2x20mm flat head screws.
- Tighten the screws evenly to maintain proper alignment.
- Install four M2.5 thermal inserts into the taller standoffs of the base designed for the MiCS-4514 sensor. Ensure proper placement.
- Insert four M2 thermal inserts into the shorter standoffs in the base, allocated for the BME280 sensor. Ensure they are flush and secure.
- Place six M2 thermal inserts into the base platform and two M2 inserts on the top of the base.
- Use the soldering iron to install them securely.
- Remove the two marked screws from the T-Display assembly (the other two screws should remain intact).
- Secure the display to the base using two M2x10mm button head screws.
- Attach a 50mm QWIIC cable and a 7-pin JST-GH plug-plug cable to the Halo Breakout PCB.
- Carefully align the Halo Breakout PCB to the expansion connector on the back of the display.
- Gently press it into place.
⚠️ Important: Ensure the pins are perfectly aligned. Misalignment, even by one row, can cause irreversible damage upon powering up.
- Apply a small patch of double-sided tape to the back of the SEN54 sensor.
- Connect the 6-pin JST-GH plug-plug cable to the SEN54.
- Position the SEN54 in the base, pushing it as far back as possible for proper clearance.
- Connect the cables to the MainBoard as follows:
- 7-pin JST-GH from the Breakout board to J3 on the MainBoard.
- 6-pin JST-GH from the Breakout board to J2 on the MainBoard.
- QWIIC cable from the Breakout board to J1 on the MainBoard.
- Secure the MainBoard to the base using two M2x6mm button head screws.
- Attach the 4-pin JST-PHR plug-plug cable to the MiCS-4514 sensor.
- Connect a 50mm QWIIC cable to the BME280 sensor.
- Secure the MiCS-4514 to the base using four M2.5x6mm button head screws.
- Attach the BME280 to the base with four M2x6mm button head screws.
- Slide the shell over the base carefully.
- Secure the shell to the base using six M2x6mm flat head screws.
Your Halo AQI Monitor is now fully assembled and ready for use. Proceed to firmware setup and testing to start monitoring air quality! """