SmartSpectra Edge Sentinel – A Consent-First Android Pulse Demo

This is a submission for the Presage SmartSpectra SDK Challenge.

What I Built

SmartSpectra Edge Sentinel is a small Android prototype that uses Presage SmartSpectra 3.4.0 to display a live pulse value obtained through the phone’s front camera.

Before any measurement starts, the app shows an in-app consent dialog. The participant can cancel or continue to the Android camera-permission check. The app also provides clear Start and Stop controls.

I developed and tested the build on a Samsung Galaxy A16 using Termux. The goal was to make the live-signal flow concrete and inspectable on a real phone, not to create a clinical product.

Demo

The unlisted YouTube video shows:

• App launch
• In-app consent screen
• Camera-based measurement flow
• Pulse values appearing and changing during the session

👉 Watch the demo

Code

Public source repository (includes build instructions and interoperability notes):

smart-spectra-hormigas-edge

The repository does not distribute an APK or AAB. A development API key injected into a compiled package can be extracted, so builds that contain an active key are kept local.

How It Responds to Human Signals

The app observes SmartSpectra metrics and displays the latest available value from cardio.pulseRateList as pulse in beats per minute.

The demo shows an initial waiting period before a value appears, followed by changing pulse readings while the session is active.

Current limitations (documented on purpose):

• The Android callback currently displays pulse only
• Although the app requests cardio and breathing metric groups, it does not yet extract breathing rate or confidence
• The Android app does not currently encode or transmit a live signal as an LBH packet

The repository also contains separate Python laboratory tests for the public lbh-sdk packet interface and an experimental fixed-length 16-byte representation. Those tests use synthetic/example inputs. They do not establish an Android-to-LBH bridge. The boundary is documented in the interoperability contract.

Prize Categories

Best Thoughtful Real-World Use

This prototype focuses on an explicit, visible camera-measurement flow and a clear display of the pulse signal, with strong emphasis on consent and transparent data handling. It is an engineering demonstration, not a diagnostic, treatment, or medical-decision tool.

Consent and Data Handling

• The app presents its own consent dialog before measurement.
• It checks/requests Android camera permission before starting the SmartSpectra session.
• Participants can cancel before starting and can stop an active measurement at any time.
• The application sets imageOutputEnabled = false and does not deliberately record or export camera video, persist biometric measurements, create LBH frames, or transmit measurements to an LBH endpoint.
• The project has not independently inspected SDK network traffic or verified provider-side retention/deletion practices.

Presage documents SmartSpectra session telemetry as enabled by default. Its documentation describes aggregate diagnostic telemetry and states that it excludes raw video/image frames and measured vital values. This app does not explicitly disable telemetry. These are provider statements, not the result of an independent network audit.

See the project’s consent and data handling notice and Presage’s telemetry and privacy documentation.

This prototype is not a medical device and is not intended for diagnosis, treatment, or medical decision-making.