Off-Grid Property Awareness
A solar-powered outdoor Doppler presence node. A weatherproofed enclosure built for real conditions. And when something moves — the mesh knows instantly.
Most property monitoring systems have the same dependency: they need your WiFi, your internet connection, and a cloud subscription to tell you what's happening outside your door. Cut the power, lose the internet, or let the subscription lapse — and your awareness goes dark with it. This build takes a different approach entirely. A Doppler-based presence detection node, integrated directly into a private Blackout Comms mesh cluster, delivers real-time motion alerts to a communicator with no WiFi, no internet, no cloud service, and no ongoing cost of any kind.
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What Happens When the Sensor Fires
When the Doppler sensor detects presence, the Blackout Comms node transmits a broadcast through the mesh cluster. That broadcast propagates to every active cluster member within mesh range. On a T-Deck or compatible communicator, the alert arrives as a live notification — the device name, the detection event, and the timestamp, delivered over encrypted LoRa radio with no internet involved at any point.
The alert chain is entirely self-contained within the cluster:
Sensor detects → node broadcasts → mesh propagates → communicator receives
No router. No internet gateway. No cloud service receiving the event and pushing it back down to a device. The mesh itself is the delivery mechanism — the same encrypted, frequency-hopping, private mesh that handles all other cluster communication.
Because the alert is a standard cluster broadcast, it is subject to all the same security properties as every other Blackout Comms transmission: encrypted, ECDSA signed by the sending node, timestamped to prevent replay, and readable only by authorized cluster members.
Why This Matters for Off-Grid Property Awareness
Cloud-based camera systems are capable and convenient under normal conditions. They stop working the moment your internet goes down, your power fails, or the service provider has an outage. They also represent a continuous stream of your property data passing through a third-party server — data you do not control, stored in infrastructure you do not own.
A Blackout Comms motion node is different in every one of those dimensions. It requires no internet. It has no server. It generates no ongoing data stream to any third party. The alert goes from sensor to mesh to communicator — entirely within your cluster, entirely on hardware you own, visible only to devices you have authorized.
For preparedness-minded property owners, rural homesteaders, and anyone who has thought seriously about what their monitoring capability looks like when the grid is down, that architecture matters. The system that tells you something is moving on your patio should be the last thing that stops working in a grid-down scenario — not one of the first.
This build is designed to be exactly that.
What Is Blackout Comms?
Blackout Comms is a private, encrypted mesh communication firmware for LoRa-capable hardware — T-Deck, Lilygo Pager, Heltec v4, and compatible builds. A Blackout Comms cluster is a closed network: only devices onboarded by the root device can join, and all traffic is encrypted and ECDSA signed at all times.
Key capabilities relevant to this build:
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Mesh memory retains the last known state of every cluster device — position, heading, speed, battery level — even after a device powers off. Any device that joins the cluster later receives this data immediately on boot.
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Zero-touch trust means any two authorized cluster devices automatically establish cryptographic trust the first time they come within radio range — no manual pairing, no administrator involvement.
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Frequency hopping makes cluster transmissions significantly harder to intercept or jam than fixed-frequency LoRa operation.
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Private clusters mean no outside device can join, read traffic, or receive alerts from your network.
The motion detection capability shown in this video extends the cluster's awareness beyond communication — adding a presence detection layer that uses the same encrypted mesh infrastructure to deliver alerts, with no additional network requirements of any kind.