This guide details the assembly of the sustainable housing for the Eco-Guardian Network nodes. By utilizing a 3D-printed hemp-filament shell, we ensure that the “Human Imprint” of our monitoring technology is as regenerative as the data it collects.
1. Components & Preparation
Materials required:
- Hemp Shell: 3D-printed using high-quality hemp-PLA or hemp-PETG filament (e.g., Kanabat or similar).
- Bio-Resin: Clear UV-resistant bio-epoxy (for waterproofing the porous hemp surface).
- Gaskets: 2mm silicone or hemp-rubber seals for the lid.
- Hardware: 4x M3 Stainless steel hex bolts and threaded brass inserts.
- Vents: 2x PTFE breathable membrane patches (to allow airflow for sensors while blocking water).
2. Step-by-Step Assembly
Step A: Post-Processing the Print
Hemp filaments can be slightly more porous than standard plastics.
- Lightly sand the exterior of the 3D-printed shell to remove any stray fibers.
- Apply a thin coat of bio-resin to the exterior. This creates a “shell” that prevents moisture from soaking into the organic fibers over time.
- Allow to cure for 24 hours in a dust-free environment.
Step B: Installing the Threaded Inserts
- Using a soldering iron set to 200°C, gently press the 4 brass M3 inserts into the pre-modeled holes in the base of the enclosure.
- Ensure they are flush with the surface to provide a tight seal when the lid is bolted down.
Step C: Sensor Mounting & Airflow
- Place the SPS30 (Air Quality) and BME680 sensors near the pre-designed intake vents.
- Apply the PTFE membrane patches over the vent holes from the inside. This allows the air to reach the sensors while keeping the internal electronics dry.
- Mount the ESP32-S3 board using the internal stand-offs.
Step D: Sealing the “Cold Bridge” Interface
- If the node is used for Soil or Water monitoring, feed the waterproof probe cables through the bottom cable glands.
- Ensure the LoRa Antenna is securely mounted to the top port with a rubber O-ring.
- Place the silicone gasket into the groove of the lid.
- Close the enclosure and tighten the M3 bolts in a cross-pattern to ensure even pressure on the gasket.
3. Maintenance & The “Human Imprint” Check
Because this enclosure is organic-based, it should be inspected every 12 months.
- Structural Integrity: Check for any signs of bio-degradation or resin cracking.
- Cleaning: Gently wipe the sensor membranes with a dry cloth to prevent dust buildup.
- Recycling: At the end of the node’s lifecycle, the hemp-composite shell can be industrially composted or shredded for re-extrusion into new filaments.
4. Connection to the Policy Nexus
Once assembled, use your Flipper Zero to test the signal strength (RSSI) through the hemp-composite walls. The organic nature of the enclosure is RF-transparent, providing excellent transmission for the 868MHz LoRa signal without the interference often found in metallic or dense plastic housings.
Next Step: provide the Python Bridge script to securely transmit the data to the IPFS network
