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Documentation

How it works, in depth.

A plain-language tour of the architecture behind both devices — the decisions, the pipelines, and the safeguards. For the complete source, see the repositories.

Echo 1 on GitHubApp on GitHub

Echo 1 Wearable

Architecture overview

Process-isolated services, single-owner hardware, and the two-layer (supervisor + systemd) resilience model.

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Hardware & wiring

Full sensor inventory, interfaces, and the validated bring-up checklist.

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Safety engine

How obstacle, drop-off and step detection stay independent of the AI model.

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Companion App

AI pipeline

ContextBuilder → 7-layer prompt → MLX Gemma 4 → sanitizer → tool parser → validator.

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Vitals & stress tiers

Apple Watch HR/HRV → personalized stress score → four emotional-state tiers.

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Caregiver linking

Consent-bounded QR + 6-digit linking, max 10 caregivers, instant revocation.

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