Sensor Fusion / Matter Native / Under $25

Know who's
home. Not how.
That's invisible.

GhostSense fuses Wi-Fi Channel State Information with mmWave radar into a single Matter device. No cameras. No PIR guesswork. Just accurate presence — even when someone's sitting still.

ESP32
Occupied
Wi-Fi CSI
mmWave Radar
Matter
<100ms Fusion latency
~$25 Hardware cost
$0 Cloud fees
How it works

Two sensors. One truth.

Each sensor has blind spots. GhostSense eliminates them with fusion — not compromise.

Wi-Fi CSI

Channel State Information reads how your Wi-Fi signal distorts when bodies move through the room. Macro movement. Wide coverage.

Strength Catches motion from anywhere in the room
Limitation Can't detect stillness

mmWave Radar

LD2410 24GHz radar reads micro-reflections — chest movement, breathing, stillness. Works in the dark. Through obstacles.

Strength Detects people who aren't moving
Limitation Occasional blind spots with partial occlusion

Sensor Fusion

Boolean OR logic: CSI sees macro movement or radar sees micro-presence — either triggers occupancy. Neither sensor's blind spot survives this.

0 false negatives in 10Hz fusion loop
Specifications

Built on an ESP32.
No hub required.

GhostSense runs on commodity hardware available from any electronics supplier. Flash once, provision over BLE, speak Matter natively.

ESP32-WROOM / ESP32-S3 — LD2410 mmWave radar
Wi-Fi CSI Range Up to 10m (macro movement)
Radar Range 0.75 – 6m (micro-presence)
Detection Moving + Stationary + Breathing
Fusion Latency <100ms
Update Rate 10 Hz (100ms loop)
Matter Device Type Occupancy Sensor (Matter 1.3+)
Ecosystems Apple Home, Google Home, Alexa, SmartThings
Power 5V USB-C, <800mA
Privacy No cameras, no audio, fully local
Works everywhere

Matter means no lock-in.

One device. All platforms. No bridge, no cloud, no subscription.

Apple Home
Scan Matter code from iPhone. HomeKit Secure Video ready.
Native Matter
Google Home
Add via Google Home app. Works with Google Home Routines.
Native Matter
Amazon Alexa
Matter discovered automatically via Alexa app.
Native Matter
SmartThings
Supports Matter devices via SmartThings app.
Native Matter
All four platforms support the Matter Occupancy Sensor profile. No vendor lock-in. No cloud dependency.

The future of presence detection
is invisible.

PIR sensors guess. Cameras violate privacy. Single-mode radar has blind spots.
GhostSense eliminates all three failure modes with sensor fusion — on a $8 chip.

Built on an ESP32. Speaking Matter. Sensing what others miss.