Product Management — OraScan H IoT Device
Consumer IoT from sensor to smartphone — product ownership of a halitosis detection device.
Scan-to-Result UX Target
Software Complete (Sprint 3)
Gas Sensor Arrays Specified
Tools & Methods
The Problem
Millions of people suffer from bad breath but never seek help because of embarrassment. A home device that gives a clear, private result in under 3 seconds could change that — but it needs to be as easy to use as a thermometer, with no technical setup required.
The Challenge
Halitosis affects an estimated 25% of the population but is severely under-diagnosed due to social stigma around clinical evaluation. The product needed to be a consumer-grade, handheld device that anyone could use at home — not a lab instrument. Defining the product requirements meant specifying a BLE pairing UX that was reliable across iOS and Android without Bluetooth expertise from the user, setting the scan-to-result latency target (< 3 seconds) as a hard product constraint, and sequencing sprint milestones across firmware, mobile app, and backend in a way that kept the hardware and software teams unblocked simultaneously. Sensor noise characterisation results had to be translated from engineering findings into user-facing confidence indicators the product could surface.
Product Requirements Document
PRODUCT REQUIREMENTS DOCUMENT
OraScan H — Consumer IoT Halitosis Device
Varun Cumbanungam · AI Product Manager · Oralens HealthCare (2023)
Doc ID
ORSH-PRD-V1
Status
Approved
Owner
Varun C.
Date
2023
Version
1.0
Problem Statement
25% of the population has halitosis but under-diagnoses due to stigma. The product must be consumer-grade: handheld, home-use, no specialist required. BLE scan-to-result under 3 seconds.
Primary Users
Consumer at Home
Self-assessment, scan history, trend charts
iOS User
Seamless BLE pair, results UI
Android User
Full experience parity with iOS
Clinical Reference
Validated readings for diagnostic use
Core Features
- H₂S sensor array — DTS4H2S + MQ316 via ADS1115
- TFLite AI severity classification on Pi Zero 2W
- BLE GATT server — streams readings to Flutter app
- Flutter app — pair, scan, results, history
- PHP backend — session persistence, cloud sync
Key Acceptance Criteria
- AC-1BLE pairing completes within 3s on iOS and Android
- AC-2Scan-to-result latency under 3s after pairing
- AC-3TFLite inference on Pi Zero 2W under 500ms
- AC-4OTA firmware runs without interrupting BLE session
- AC-5App onboarding completable without user manual
- AC-6Backend API rate-limited, MIME-type validated
Sprint Milestones
- S1Pi Zero 2W BLE GATT + sensor polling
- S2Flutter BLE client + live readings UI
- S3TFLite model + severity classification
- S4PHP backend + session persistence
- S5OTA flow + iOS/Android acceptance testing
Product Artefacts Delivered
- PRD V1 — BLE UX spec, personas, ACs
- Hardware requirements — sensor, ADC, GPIO wiring
- GATT service definition — characteristic UUIDs
- Sprint plan S1–S5 — parallel workstreams
CONFIDENTIAL · OraScan H PRD · Property of Oralens HealthCare
PRD · Hardware Spec · GATT Definition · Sprint Plan S1–S5
Full PRD and supporting artefacts available upon request
Results
Reached 92% software completion by Sprint 3 with a production-ready mobile app and backend. BLE pairing target of < 3 s achieved and validated on both iOS and Android. The Flutter app shipped a complete onboarding, pairing, and results flow. Sprint planning structured deliverables across four parallel workstreams — embedded firmware, mobile app, backend, and hardware enclosure — without cross-team blockers. OTA firmware update specification designed as a non-interruptive background process to avoid user-facing disruptions post-shipment.
Gallery & Demos
Device Front View
Consumer-grade handheld form factor with ventilation grilles for the gas sensor array, central sensor lens, and green status LED.
LED Status States
Four GPIO-driven LED states: off (standby), green (scan complete / pass), blue (scanning), red (alert / fail).
Top Profile View
Overhead perspective showing overall geometry and ergonomic grip area.
LED Status Indicator States
Visual guide showing what different LED patterns communicate during scan process and results.
Side Profile — Right View
Right side showing the USB-C charging port and side power button, with gas intake vents visible at the top.
Mouthpiece Detail
Close-up showing the sensor interface where patient breath sample is captured.
Thin Profile View
Perspective emphasizing the slim, pocket-friendly form factor for consumer portability.
Click any image or video to expand · ← → keys navigate
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