← halfmarble

Parkinson's, sensing
and the open record

halfmarble builds software for iPhone, iPad and Mac. This page holds the other half of the work: the Parkinson's research, the sensing hardware still in design, and the ideas we have published so no one can fence them off.

Everything here is positioned under the FDA 2019 General Wellness Policy. None of it diagnoses, treats or manages any disease, and none of it replaces your clinician.

Start here // Two pages worth your time
For researchers
What we measure, and how

Measurement scope, signal definitions and the limits we state up front. Written for people who will check the method.
Glass Box
Every field, every transformation

What gets captured, what gets shared, and every "we will never." Documented in plain language.
In design // Sensing and tracking
Hardware // Design stage

UnSteadyRing

Ten chipless passive rings, one per finger. Two wrist-worn hubs designed to excite them with passive RF telemetry and fuse the returned digit kinematics with continuous autonomic biometrics (single-lead ECG, PPG, skin temperature); an ankle hub for gait and freezing-of-gait. The Steady tools intervene — UnSteadyRing observes. Intended as the continuous, contextualized reference layer for everything else — sensing hardware is in early R&D (design stage).

● 17 DEFENSIVE PROVISIONAL APPLICATIONS
● 10 CHIPLESS PASSIVE FINGER RINGS
● REFLECTED-WAVE TELEMETRY
● AUTONOMIC PHYSIOLOGICAL SENSORS
● PER-FINGER TREMOR QUANTIFICATION
● ANKLE HUB · GAIT & FREEZING-OF-GAIT
Hardware design targets — no device built yet
READ THE WRITE-UP SEE THE GAIT DEMO
Software // In development

SteadyFuelTracker

A specialized metabolic intake engine designed around the Therapeutic Carbohydrate Restriction (TCR) guidelines championed by the Public Health Collaboration (PHC). This is not a diet app. It will be a macro-nutrient tracker that lets you log carbohydrate and protein timing relative to your levodopa doses and track your own nutritional ketosis, following TCR guidance.

● TCR PROTOCOL ALIGNMENT (PHC)
● LEVODOPA / PROTEIN INTERFERENCE LOGGING
● GLUCOSE & KETONE (GKI) SYNCING
● MACRO-TO-MOTOR STATE CORRELATION
IN DEVELOPMENT
Software // Demo

SteadyDoseTracker

A pharmacokinetic visualizer that models the blood concentration curves of the medication schedule your doctor prescribed. Half-life math shows how your levels rise and fall in real-time — not to tell you what to take, but to help you and your clinician see what is already happening.

● BATEMAN PHARMACOKINETIC MODEL
● FASTING-AWARE ABSORPTION
● GLASS BOX SOURCE TRACING
● OBJECTIVE MOTOR TESTING
● CALENDAR → MOTOR DEMAND PREDICTION
SEE THE ENGINE
Software // Demo

SteadyFastingTracker

A specialized fasting engine grounded in current autophagy research, with the sources traceable from every number it shows. Not a lifestyle app: a measurement tool you can check.

● AUTOPHAGY-INFORMED PROTOCOLS
● THERAPEUTIC CARBOHYDRATE RESTRICTION (TCR)
● GLASS BOX SOURCE TRACING
● GKI & METABOLIC TRACKING
● SAFETY CIRCLE — HUMAN-IN-THE-LOOP ESCALATION
SEE THE ENGINE
Open IP // What We Open, What We Protect

Steward, not owner — of data, and of ideas. The methods we want anyone to be free to use, we publish as dated, public-domain prior art, so no one can fence them off later. The core sensing platform, we protect by filing.

Published defensively // Public domain

Defensive publications in the Technical Disclosure Commons, an examiner-searched prior-art database. Dated, public-domain, and freely practicable by anyone.

• Consumer earbud as a closed-loop biometric sensor for exercise support — TDCommons 10440
• Heart-rate-recovery-gated rest-interval timing through a consumer earbud — TDCommons 10441
• Crediting recorded prior activity toward an exercise warm-up — TDCommons 10439
• Robust overnight heart-rate-variability estimation independent of sleep staging — TDCommons 10443
• Nap-level autonomic (HRV) tracking and a nap-day recovery comparison for daytime sleepiness in Parkinson's — TDCommons 10454
• Active-sleep (dream-enactment) burden as a longitudinal self-tracking signal in movement-disordered sleep — TDCommons 10455
• Per-session sleep onset latency as a two-tailed self-tracking signal in Parkinson's, across nights and naps — TDCommons 10494
• Synchronized multi-line digital signal generation on an ESP32 (NEAToBOARD) — TDCommons 10442
• Opt-in comparison of a wearable biometric against population and disease-cohort distributions, computed on-device under differential privacy — TDCommons 10495
Protected by filing // UnSteadyRing

The UnSteadyRing wearable sensing platform — passive finger nodes read by wrist-worn hubs — is protected by seventeen provisional patent applications filed with the USPTO in 2026, covering fine-motor and bioenergetic sensing across the hand, limbs, head, and ground interface.

→ Reversed-topology finger sensing — inductive, fractal-resonant, magnetic, and RF-backscatter nodes
→ Bilateral and lower-extremity telemetry; battery-free intra-body-powered rings
→ Head-worn earbud-IMU neuromotor observation; striking-exercise biomarkers
→ Standing-platform multi-modal sensing — lean-mass-adjusted steadiness, autonomic–somatic and bioenergetic–neuromotor correlation, repeated-squat power decrement

The Un prefix is intentional — UnSteadyRing observes; it does not intervene.