Research library · canonical home: /research
Five guided paths into PPG science, teaching, implementation, open research, and invention. Each path returns to annotated papers so a build or landscape claim stays connected to what the evidence can actually support.
Five primary paths
Each record gives one first action. Open its secondary detail only when you need more sources or boundaries.
See what PPG is, connect a documented PulseSensor, make one clean graph, and then read the papers that explain what shaped the signal.
Describe what you observed; do not turn one waveform into a diagnosis or a general accuracy claim.
Choose a teachable question with clear materials, a safe protocol, a repeatable lab plan, assessment prompts, and literature students can cite.
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Ask students what changed, what stayed controlled, what failed, and what evidence would change their conclusion.
Follow a documented hardware/software route, inspect raw PPG, record signal-chain and sampling decisions, and troubleshoot contact, motion, and data quality.
PulseSensor supplies a raw single-channel green-light reflectance PPG input. It does not supply SpO2, blood pressure, or medical-device validation.
Start with annotated evidence, identify method and population limits, define a replication contract, and publish data, code, references, exclusions, and failures.
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Current contribution path: publish a stable protocol, raw or synchronized data, code, metrics, exclusions, quality labels, and negative results, then share that public record with PulseSensor. This release does not claim a formal submission portal or maintained review queue.
Map the papers first, then connect devices, chips, patent families, unresolved technical problems, and project ideas without confusing disclosure with evidence or clearance.
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Status screens are dated research checks, not legal advice or freedom-to-operate conclusions.
Shared core object
A recipe is not only build instructions. All seven fields are required before this library calls a path fully linked.
Recipe 001 · respiratory information in PPG
Ask what can be observed or estimated from PPG, under which conditions, and against which reference.
Read the physiology shelf →The bibliography connects physiology, extraction methods, quality, and failure literature. Stevens et al. 2024 adds a limited 15-adult off-the-shelf PulseSensor study.
Open a core annotated paper → · Stevens et al. →Use the current PulseSensor setup, inspect raw data, and start from the existing gentle breathing-related project seed. Preserve hardware, software, placement, sampling, and conditions.
Open the experiment seed →Use a synchronized reference, predefined windows, metrics, exclusions, and quality labels. Motion, contact, site, sampling, and physiological variation can defeat the method.
Use the replication contract →PulseSensor is a documented raw single-channel green-light reflectance PPG input with open-source software. It is not a respiratory or medical instrument.
Open the implementation record →The Innovation Graph connects technical paths with active, expired, and abandoned status screens reviewed 2026-08-01. Status, jurisdiction, continuations, and claim scope require fresh legal review.
Open the patent overlay →Publish synchronized signals, code, methods, participant splits, quality labels, and failure cases across people, sites, and conditions.
Open the benchmark roadmap →An observed modulation is not a diagnosis. A documented product is not clinical validation. A public patent record is not permission.
Return to the library home →Always visible
These boundaries apply to every persona and recipe.
Research and education only. No diagnosis, treatment, clinical-performance claim, or substitute for validated medical equipment. PulseSensor does not measure SpO2 or blood pressure.
Use gentle, low-risk protocols; stop if uncomfortable. Follow teacher, institution, and science-fair rules before human-participant work, and do not publish identifiable health data.
Disclosures are not validation. Status screens are dated, not legal advice or FTO. Educational or noncommercial use does not automatically clear active patent rights.
Evidence spine
Use the suggested reading order for orientation, then move through 47 annotated records. This is the site's strongest current curated evidence shelf, with particular depth in respiratory information from PPG; it is not a claim of complete PPG coverage.
Open the complete bibliography →Scientific-evidence source · canonical library home: /research
Preserved source collections
The library indexes these Pages; it does not rewrite them. Some preserved Pages may still use an older “Research home” label. Return to `/research` for this library.
The compact original three-lane collection for bibliography, observed use, and experiments.
Open collection →Return to /research
Safe starter questions, project workflow, advanced seeds, and reporting boundaries.
Open projects →Return to /research
Verified uses, signal-chain context, implementation links, limits, and reproducibility fields.
Open research record →Return to /research
The respiratory paper-to-patent-to-product-to-replication-to-roadmap pilot.
Open graph →Return to /research
Wearables, chips, clinical-sensor context, curated families, status dates, and legal uncertainty.
Open atlas →Return to /research
The shipping educational platform and setup route. Product context does not establish clinical validity.
Open current product →Return to /research