Cheap room sensors plus a report generator that turns a winter of temperature and humidity data into evidence a tenant can send a landlord.
Battery e-paper price tags and a tiny gateway, so an independent shop can reprice a whole aisle from a spreadsheet.
A retrofit temperature logger for small food businesses that keeps a tamper-evident cold-chain record inspectors will actually accept.
A plug-in sensor that records mains outages, sags, and frequency drift in your home, so you can prove what the grid is doing to your house.
A bench device that measures what a USB-C cable can actually carry — power, data, orientation — and prints a sticker so you never guess again.
A cheap doorway sensor and dashboard that gives small retailers hourly visitor counts and conversion rates without recording anyone.
A small home controller that delays dishwashers, dryers, and water heaters into the cheapest, lowest-carbon half-hours of the night.
A seatpost sensor and companion app that scores how rough every street you ride is, then draws it on a map you can act on.
A small LoRa hardware beacon and companion app that lets hiking or hunting groups share location and status pings with zero cell signal.
An ESP32-powered desk light that glows red, yellow, or green based on your team's live build status, so nobody has to alt-tab to check CI.
A bedroom sensor node that logs temperature, humidity, CO2, light, and noise overnight, then correlates conditions against your sleep tracker's score.
An ESP32-CAM sensor that watches your mail slot or porch, classifies deliveries versus junk mail with a small vision model, and pushes a notification only when it matters.
An ESP32-powered e-ink display that shows today's calendar, weather, and a single priority task, refreshed a few times a day with zero phone pickups.
An ESP32-based inline USB-C monitor that logs real-time voltage, current, and wattage to a local web dashboard — useful for auditing chargers and understanding device charging behavior.
A cheap ESP32 and capacitive moisture sensor that logs soil conditions to a self-hosted dashboard and sends push alerts when your plants need watering.
A $4 ESP32 board that passively scans for your phone via Bluetooth and publishes room occupancy to a local MQTT broker — no cloud, no camera, no app.
A sub-$40 ESP32 sensor kit paired with a self-hosted web dashboard to track CO2, particulates, and VOCs in your home — no cloud account required.