Connect cheap air sensors and publish a live, calibrated pollution map
Advanced28h2–4
SensorsPythonLeaflet
15/20Empty Room Energy Nudge
Detect rooms with lights or AC on and nobody inside, and nudge someone to switch off.
Intermediate16h2–3 people14/20 fit
Build Empty Room Energy Nudge for offices and campuses in ~16h with 2–3 people. Stack: Sensors + Node.js + Slack API + Charts.
Why it wins: Hardware plus software with measurable savings.
Build flow
01 · Problem
Empty rooms waste energy for hours every day.
02 · Solution
Combine occupancy from a low-cost sensor or calendar with power data, send a nudge to the room owner and track savings.
03 · Build
- 1Read sensor or calendar occupancy
- 2Compare with power use
- 3Send nudges
- 4Track savings
04 · Demo
Show a room flagged as empty with AC on and the nudge on a phone.
MVP checklist
- Occupancy detection
- Waste alerts
- Owner nudges
- Savings dashboard
Tech stack
| Tech | Role | |
|---|---|---|
| Sensors | Tooling | Tool |
| Node.js | Backend runtime | Backend |
| Slack API | Chat integration | API |
| Charts | Data visualisation | UI |
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