SIH26118: Passive Colorimetric H2S Exposure-Dosimeter Wristband with AI-Based Quantitative — SIH 2026 | Wynit

SIH26118: Passive Colorimetric H2S Exposure-Dosimeter Wristband with AI-Based Quantitative — SIH 2026 | Wynit

What they'll ask you

13

Generated from the brief's own wording and the competition's published rules, never from a guess about what this ministry prefers.

The exact chemical formula to use for the strip?
The brief never answers this, so a panel will. Whatever you decide, say it the same way twice.
The specific target accuracy percentage for the dose estimate?
The brief never answers this, so a panel will. Whatever you decide, say it the same way twice.
The exact temperature and humidity compensation formula required?
The brief never answers this, so a panel will. Whatever you decide, say it the same way twice.

10 morethe ones a panel gets to if there is time

Has any part of this been shown at a previous event, hackathon or college project?
The guidelines are explicit: your solution must not have appeared in any previous event or programme, of any sort. A recycled project is what a team under time pressure reaches for.
The brief asks for chemical strip formulation. How would you build that?
Decoded from SIH26118 itself: Formulate a chemical strip that darkens progressively and permanently with cumulative exposure and accounts for temperature and humidity. The brief asks for it by name.
The brief asks for expiry indicator patch. How would you build that?
Decoded from SIH26118 itself: Design a separate patch on the wristband that shows whether the badge is still valid before use. The brief asks for it by name.
The brief asks for mobile capture app. How would you build that?
Decoded from SIH26118 itself: Develop a phone application that captures a photograph of the strip next to a reference color scale. The brief asks for it by name.
The brief asks for image calibration engine. How would you build that?
Decoded from SIH26118 itself: Build an algorithm within the app to correct for lighting conditions and convert the strip color into a cumulative exposure figure. The brief asks for it by name.
The brief asks for logging and reporting. How would you build that?
Decoded from SIH26118 itself: Implement a logging system to record exposure estimates against worker IDs and shift details for safety reporting. The brief asks for it by name.
Where does your data come from: a published source, one you collect, or one you generate?
No dataset is attached to this problem statement, so sourcing it is part of the work and nobody told you that.
Why not use what already exists? Name the closest thing to this that is already running.
A team that has not named the alternative themselves is answering this for the first time in the room.
Which single thing will you demonstrate end to end, start to finish, with nothing skipped?
Ours, not a rule: a narrow thing that fully works survives questioning better than a broad thing that half works. If nobody on the team can name it, that is the finding.
Show me this working: the jury will check if you have a working hardware prototype tested against a controlled lab-simulated hydrogen sulfide exposure, a validated shelf life, and an app that correctly reads exposure from a photograph.
This is the evaluator read for your problem statement, decoded from the brief's own wording.

The government's original description (354 words)

• Background Workers in oil and gas operations face chronic low-level H2S exposure. Standard electronic gas detectors miss this risk because they only report instantaneous ppm, and they need batteries, calibration and upkeep. Passive colorimetric badges already exist, usually lead-acetate based, but they only give a rough visual read, exposed past threshold or not, judged by eye. There's no way to know the actual cumulative dose, concentration multiplied by time, and no way to confirm the badge itself hasn't already expired or degraded before it's worn. India has no low-cost, indigenous, digitally-read passive dosimeter for this. Peak-exposure alarms are not what protects long-term health. Cumulative dose is. • Description The idea is a disposable wristband with an indigenously formulated chemical strip that darkens progressively and permanently with cumulative H2S exposure, not just past one threshold. The strip sits next to a printed reference color scale, and separately, a second patch that shows the badge's own shelf life. Something a worker or safety officer can glance at before a shift to confirm the badge itself is still valid. A phone app does the reading. Photograph the strip next to the reference scale, and the app corrects for whatever lighting the photo was taken in by calibrating against that reference. It converts the color into an estimated cumulative exposure figure and logs it against worker ID and shift, for occupational health records and DGMS or OISD style reporting. The dose figure should be presented as an estimate, since colorimetric reactions don't scale perfectly linearly at very low concentrations or over long durations. Temperature and humidity affect reaction speed too, so the strip design needs to account for that, either through a sealed reference cell or a compensation method in the app. • Expected Solution A working wristband prototype, chemical strip plus a separate expiry indicator, along with a phone app that reads and quantifies exposure from a photograph. Tested against a controlled, lab-simulated H2S exposure at known concentration and duration, with a stated and validated shelf life, 30 or 90 days for example, and a dose estimate that tracks reasonably close to the known simulated exposure.