Passive Colorimetric H2S Exposure-Dosimeter Wristband with AI-Based Quantitative Reading

The receipts 🧾

Every red flag on this statement, in full. These are the four places it bites.

1. Exhibit A

   Hydrogen sulphide is lethal at low concentrations and generating calibrated test exposures requires laboratory infrastructure and safety clearance no student team has

2. It gets worse

   Without calibration exposures there is no dose-response curve, so the app converts colour into a number that has never been anchored to reality

3. Still reading?

   Formulating an indigenous chemical strip with a progressive rather than threshold response is a materials chemistry problem, not an engineering one

4. And the finisher

   An occupational health device that under-reports exposure has direct consequences for a worker's health, so unvalidated dose figures are a serious claim to put in front of a safety judge

The damage report 📉

Every score this statement earned, and what each one actually costs you.

• Feasibility

  2/5

  You have picked a fight with physics, procurement, or both. One of them always wins.

  The description requires testing against controlled lab-simulated hydrogen sulphide at known concentrations, and hydrogen sulphide is acutely lethal — generating calibrated exposures needs a fume hood, gas standards and safety protocols a student team cannot access, so the strip cannot be calibrated or validated.

• Innovation scope

  4/5

  There is something genuinely new here. Do not bury it under another dashboard.

  The chemistry formulation, the shelf-life indicator mechanism and the temperature and humidity compensation approach are all left to you, and the description explicitly offers alternatives such as a sealed reference cell or software compensation.

• Clarity

  5/5

  The ask is unambiguous, which quietly removes your favourite excuse.

  The description is exceptionally precise, naming the deliverable components, the reference-scale correction method, the expiry patch, the dose-versus-threshold distinction, and even acknowledging that colorimetric response is nonlinear and temperature-dependent.

• Acceptance potential

  2/5

  The numbers do not like you. Bring something the numbers cannot see.

  An unusually well-written statement with an unbuildable core — the indigenous chemical formulation and its dose calibration require a chemistry lab and lethal gas handling, and an app that reads colour swatches accurately has demonstrated the easy half while the safety-critical half remains unproven.

• Effort

  Massive

  A semester of work wearing a hackathon costume. Something is getting cut; decide what now, not in week five.

  Chemical strip formulation, wristband construction, an expiry indicator and a colour-calibrated phone app is a chemistry project and a software project running in parallel, with the chemistry gated on lab access.

• Demo-ability

  Hard

  Near impossible to show working in five minutes, which is roughly five minutes more than you get.

  You cannot safely generate controlled hydrogen sulphide exposures, so the strip's dose response — the entire point of the device — cannot be demonstrated, leaving you showing an app reading colours from surrogate samples.

• Data

  None supplied

  No dataset comes with this one, so every accuracy figure you quote is a number about labels you invented.

  Nothing is provided with the statement. You are sourcing, cleaning and labelling it yourself, and that work is invisible in the demo but very visible in the questions.

The demo they will have already seen 🪞

Somewhere around 50–110 teams are heading here, and the description is doing the choosing for most of them. They will read the same brief, reach the same architecture, and build a version of the same demo you are planning. Being correct is the floor. If your five minutes could be swapped with the team before you and nobody in the room would notice, you have not picked badly — you have built predictably, which costs exactly the same and hurts more.

What survives 🛡️

The ground worth standing on when the questions start.

• The reference-scale-in-frame approach to lighting correction is a genuinely sound method and the app half can be built and validated properly with printed colour standards
• The shelf-life indicator patch is a small, clever feature that addresses a real gap in existing badges and costs almost nothing to design
• The description honestly acknowledges nonlinearity and environmental effects, which tells you exactly which caveats your presentation must carry