Technology & System Architecture
Stag Node deploys a three-tier, edge-native ambient monitoring platform built on bare-metal enterprise principles. Every component—from multi-modal RF radar buses to localized time-series anomaly detection—operates strictly within the residential perimeter.
Tier 1: Multi-Modal Ambient Sensing
Passive, non-intrusive environmental and spatial telemetry that eliminates optical lenses and microphones entirely:
- 24GHz mmWave Radar: Tracks micro-movement, respiration vectors, and sudden trajectory drops indicative of a fall.
- PIR Motion Arrays: Directional transit velocity across doorways and corridors.
- Magnetic Micro-Contacts: Sub-millimeter switches on medicine cabinets and refrigerators.
- Shelly Power Relays: Electrical current monitoring for passive kettle and range ADL verification.
- Custom ESP32 Pods: Bespoke microcontrollers housed in 3D-printed PETG chassis.
Tier 2: Local Telemetry & Anomaly Analysis
High-performance edge nodes process raw sensor streams with zero external cloud round-trips:
- HomeAssistant Core: Local device abstraction bus running containerized on Proxmox / Kubernetes.
- Prometheus TSDB: Scrapes telemetry with millisecond timestamps to compile longitudinal behavioral graphs.
- Circadian Z-Score Scoring: Evaluates nocturnal bathroom dwell deviations to detect subtle early health changes (e.g. UTIs).
- Mobility Velocity Baselines: Detects progressive slowing from bed to chair before falls occur.
- Grafana Observability: Objective, trend-based visibility for caregivers.
Tier 3: Dual-Path Caregiver Alert Dispatch
Alerting engineered for high availability and total resilience during residential broadband outages:
- Encrypted Mesh Tunnel: Direct peer-to-peer WireGuard or Tailscale tunnels dispatch instant push alerts straight to caregiver phones.
- Zero Cloud Intermediaries: Telemetry never routes through or resides on corporate third-party servers.
- Dedicated Cellular SMS: Out-of-band hardware modem transmits acute fall notifications even if the home fiber/cable is severed.
- Triage-Ready Context: Clear actionable notices ("dad moving slower") instead of false alarms.
- Zero Subscriptions: Operates indefinitely without recurring SaaS fees.
🔬 Multi-Sensor Packing: The SmartCare Telemetry Node (SN-SC-NODE-01)
Commercial consumer smart homes suffer from the "Wall Acne Problem": sticking three or four disparate plastic pucks with disposable coin-cell batteries onto the walls of a single room. Stag Node eliminates this by packing multiple sensing modalities into unified, bespoke hardware prototypes:
Integrated Sensor Pod
Combines 24GHz mmWave radar, high-sensitivity PIR motion, ambient light lux sensors, and external analog bed-mat conditioning in a single compact 100x68x50mm chassis.
Additive Manufacturing
Chassis 3D-printed in heat-resistant PETG on automated CNC printers, assembled with thermally installed brass threaded inserts for lifetime serviceability.
Field OTA Updates
Dual-slot flash partitions with automated watchdog rollback allow sensitivity calibration and firmware patching remotely over Wi-Fi without entering private rooms with ladders.
🛡️ 3-Tier Enterprise Network Isolation (10.VLAN.ROOM.DEVICE)
Privacy is guaranteed at Layer 3 of the network stack. Hardware firewalls enforce absolute isolation between management, IoT sensors, and emergency safety channels:
| Network Tier | Subnet | Zero-Trust Firewall Policy | Assigned Devices & Services |
|---|---|---|---|
| VLAN 01 (Management) | 10.1.0.0/16 |
Full Routed WAN Egress | StagNode Core Host, Proxmox Hypervisor, Smart Switch, UniFi APs |
| VLAN 10 (SmartCare IoT) | 10.10.0.0/16 |
HARD WAN EGRESS DROP | mmWave Radars, PIR Arrays, Bed Mats, Smart Relays (Local MQTT Only) |
| VLAN 20 (Life-Safety) | 10.20.0.0/16 |
HARD WAN EGRESS DROP | Hardwired Panic Buttons, Isolated RTSP Safety Feeds, Local Siren Relays |
The Sovereign Edge Advantage
| Capability | Commercial Cloud Systems | Stag Node Architecture |
|---|---|---|
| Visual Privacy | ✗ Invasive video cameras in living areas | ✓ 100% Camera-Free (Passive Radar & Sensors) |
| Data Custody | ✗ Corporate clouds & data brokers | ✓ 100% Local Silicon (Zero Egress) |
| Outage Resilience | ✗ Goes dark when internet drops | ✓ Autonomous Local Execution + Cellular SMS |
| Senior Compliance | ✗ Wearables seniors forget to charge | ✓ Zero Compliance (100% Ambient) |
| Ongoing Cost | ✗ Mandatory monthly subscription lock-in | ✓ Zero Mandatory Cloud Subscriptions |
| Data Longevity | ✗ Retained or monetized by third-party SaaS | ✓ Family Sovereignty (Private Local Storage) |