A passive, camera-free perimeter tripwire. ESP32-S3 sensor nodes listen for Bluetooth signals and feed your phone over Wi-Fi — no cloud, no account, no AI. Everything runs on-device.
BLE Tripwire turns inexpensive ESP32-S3 boards into passive BLE listeners, feeding real-time data to an on-device pipeline that runs entirely on your Android phone.
Sensor nodes silently observe Bluetooth Low Energy advertisements — phones, wearables, trackers — without transmitting scan requests or connecting to observed devices.
An embedded Node.js pipeline on your phone anonymizes, analyzes, and runs a deterministic zone-breach state machine. Nothing leaves the device.
Device addresses are HMAC-anonymized at ingest with a per-install random key. IDs are not comparable across installs and not derivable from source.
Every alert transition is written to an HMAC-chained audit log. Verify integrity anytime via the dashboard or API.
Your phone's Wi-Fi hotspot is the only network. No accounts, no subscriptions, no outbound traffic. Total data sovereignty.
ESP32-S3 boards are inexpensive and widely available. Firmware is included as Arduino sketches — flash, configure your hotspot SSID, and go.
Get an ESP32-S3 on Amazon →
Unknown emitters near a sensor trigger WATCH. Confirmed inside the RSSI threshold triggers ALERT. Rising signal strength across sweeps means someone is closing in.
Unknown emitter detected near a sensor node
Emitter confirmed inside the zone RSSI threshold
Signal strength trending up — highest priority
Baseline-captured devices in your environment
BLE Tripwire was designed from the ground up with zero-trust, on-device privacy as a first-class requirement — not an afterthought.