DampOne

How it fits together

DampOne, part by part

Scroll or tap a part. Press “See the 3D CAD design” to watch the model, built from our CAD, light each part up and show how it connects.

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Real-time 3D render · drag to rotate · final design may varySwipe sideways to rotate

1. 01

   The whole DampOne

   The extractor fan in the bathroom ceiling is the room's own damp and water watcher: two heat-camera chips, a humidity chip, a 60 GHz radar chip and a mic chip sit on our one ring board in its grille rim, and the brain on the same board runs the fan, makes the room's calls, lights them on the grille and tells the family.

2. 02Brain

   Our grille board: the ESP32-S3 radio module on its ceiling side

   The brain: it runs the dampone-fw program

3. 03

   Wall heat camera

   Reads the outside wall, the ceiling by it and the window: the coldest corner for condensation and mould-risk hours

   Our grille board: the ESP32-S3 radio module on its ceiling side · I²C on the board, on the tab folded 60° up behind the side window (factory-set address) · 32 x 24 heat frame, 1 a second

4. 04

   Floor heat camera

   Sees water spreading on the floor, a warm bath filling and the washer front

   Our grille board: the ESP32-S3 radio module on its ceiling side · I²C on the board, over the floor window · 32 x 24 heat frame, 1 a second

5. 05

   Humidity and temperature

   Room air humidity and temperature for the dew point, on the slotted tongue at the side vents

   Our grille board: the ESP32-S3 radio module on its ceiling side · I²C on the board, on its tongue 170 mm or more from every warm part · RH and °C every 10 s

6. 06

   Presence radar

   Knows if anyone is in the bathroom, even lying in the bath, so empty-room calls are right

   Our grille board: the ESP32-S3 radio module on its ceiling side · SPI on the board, behind the 1.5 mm skin · Range-Doppler frames for motion and breathing, every 0.1 s

7. 07

   Microphone

   Hears running water, drips and the washer's spin and drain

   Our grille board: the ESP32-S3 radio module on its ceiling side · PDM on the board, through its gasket to the mic port · Sound, processed in memory, never stored

8. 08

   Call light and tone

   Shows each call on the grille: white fan glow, amber damp, blue water, green washer done, with a tone

   Our grille board: the ESP32-S3 radio module on its ceiling side · One LED data line through the level shifter + PWM to the sounder driver · Light colour and tone

9. 

   09

   Security chip, tamper switch, fan drive and supply

   Signs each call; marks the log if the grille comes off; runs the fan; 5 V from the supply above the ceiling

   Our grille board: the ESP32-S3 radio module on its ceiling side · I²C + GPIO on the board; fan PWM and tach and 5 V on one latched lead through the grommet · Signatures, tamper flag, fan speed, power

10. 10

    All connected

    8 key parts, one program, and your phone

Our circuit board · rev A-0

One board of our own inside DampOne

Every chip on one board we design, shaped to fit: the processor, cameras and sensors, Wi-Fi and Bluetooth, lights, sound and power. No plugs, ribbons or adapters. It is checked in our CAD against every part around it, and it arrives from the maker ready to run our software from a microSD card. Turn the model, or pick a part below to see where it sits.

Demo · 6 real-world moments

See DampOne work

Short animated scenes of real moments: what happens today, what DampOne does about it, and what lands on your phone. The same scenes play in the IEMI app.

Demo scenes show how DampOne and its app are designed to behave. DampOne is in design; nothing here is recorded from real equipment yet.

The idea

The bathroom extractor fan sees the cold wall, the steam and water on the floor, and makes the room's damp calls itself

How the parts connect

DampOne, wired up

Every part, what links it to the brain, and how the data reaches your phone. A solid line is a cable; a dashed line is a radio link.

The program

What controls DampOne

for (;;) {
    mlx90640_frame(WALL, &wall); mlx90640_frame(FLOOR, &floor);   // U21, U20: 1 Hz each
    sht45_read(&air); person_t who = bgt60_presence();    // U10, U3
    float margin = coldest(&wall) - dew_point(&air);
    fan_pwm(fan_curve(margin, who.present));          // U5: the fan's own DC motor
    calls_t c = room_step(&wall, &floor, &air, &who); // damp hours, water, bath, still
    if (pdm_window(&snd)) water_and_washer(&snd, &floor, &c);   // MK1
    for (call_t *k = c.list; k; k = k->next) {
        if (k->conf < k->line) k->kind = UNSURE;   // never guess
        atecc_sign(k); light_and_tone(k); publish(k); // U2; MQTT over TLS
    }
}

To your phone

How the data reaches DampOne home app

Family phones (Android and iPhone); a read-only damp record link for the landlord or surveyor if the tenant shares it

1. Extractor fan
2. Home Wi-Fi (WPA3) · MQTT over TLS
3. IEMI cloud
4. Push and SMS
5. Family phones

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing; UK pound price to be confirmed. Bought separately, a smart 100 mm fan (about $150, £115-130), MouldGuard ($69), a WaterLeak home unit ($199) and a CycleTap puck ($25) add up to about $443. Parts cost about $250 per fan at qty 1 including the fan body (prices checked 28 Oct 2026, est.).

Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.

1. 3 Nov 2026, 23:19LatestA family or landlord reading the DampOne page should see the bathroom extractor fan as it will be sold: one ring-shaped board of our own in the grille. Until now the 3D view, the parts list and the wiring still lit the bench parts (a XIAO module, two heat-camera boards, a humidity board, a radar module, a mic board, two LED sticks, a buzzer and a security board), so the page showed a prototype, not the product.

   • What we designed: DampOne rev T, the extractor fan with our board in the grille, the last of the five products to get this step after AthleticsOne, RacketOne, CellOne and RoomOne. Every bench part comes out of the grille; only the 5 V mains supply stays, above the ceiling in the fan housing. The grille gets the three changes the board asked for: the side window for the wall heat camera moves 2 mm down so it sits exactly on the folded camera's line of sight, a 6 mm hole with a grommet in the top lets the lead from the housing reach the board, and the plastic over the 60 GHz radar chip is thinned from 2 to 1.5 mm to suit its wavelength. The Wiring and Program sections now name our board: the ESP32-S3 reads both heat-camera chips, the humidity chip on its tongue, the radar chip and the mic chip, and drives the call light, sounder and fan. See /products/dampone/ and /build/dampone-boards
   • How we checked it: every board part was checked in 3D against the grille, with a 0.3 mm skin inside every wall, window and vent, and against the supply in the housing. Nothing touches: the floor heat camera's lens is 0.4 mm above the grille floor, and the folded wall camera 0.48 mm from the side wall, on its window's centre within 0.23 mm. The mic's sound seal sits on the grille floor round its port. All 15 camera and radar view checks still pass at the new window height, and the assembly check shows no problems. DampOne's board review now passes its "board inside the product CAD" check.
   • Every board re-run: the board code, the design reviews and the design packs for all seven boards (0 problems, 0 fails, KiCad 0 violations). No new CricketOne decisions since the last update, so nothing new was carried to the other boards this time.
   • What is next: all five earlier boards now sit inside their products. The next step is a new board, KitchenOne (row B7), made with every board rule from the start.

   See it in 3DFull research and design

2. 3 Nov 2026, 19:55A family or landlord buys DampOne as the bathroom's extractor fan, so its electronics must be one board an assembly house makes and tests the same way, with nothing plugged together inside a 30 mm grille rim that sits in shower steam every day.

   • What we designed: one board in the fan grille's sealed rim, a 194 mm square ring around the air path, lying flat with the room side down. On the room side: the floor heat camera over its window, the radar chip under the grille skin, sixteen call-light LEDs behind the two opal slots and the sounder under the tone holes. On the ceiling side: the ESP32-S3 module with its antenna at the ring's edge, the security chip, the tamper switch under its plunger, a mic over a hole in the board, one latched 4-way lead from the housing (5 V and the fan's speed signals, so mains never comes below the ceiling), and the humidity chip on its own tongue at the side vents, cut free by a U-shaped slot. The wall heat camera sits on a small tab that a 4 mm flex bends 60 degrees up, so it looks 30 degrees down out of the side window at the outside wall. It replaces the XIAO, both Adafruit heat-camera boards, the SHT45, radar, mic, NeoPixel and ATECC608 boards and their leads. See /build/dampone-boards
   • How we checked it: the board is written as code and opened in KiCad (0 design-rule violations). It places 35 parts at their datasheet sizes and checks that each sits on the ring or the tab, clear of the air path, the notch and the tongue slot, with no overlaps; that heights fit both sides of the rim; that the floor camera, radar, sounder, mic, tamper switch and both light rows sit on their windows in the grille design; that the humidity chip is at the vents, 170 mm from the radio and power parts; and that the folded wall camera looks along the grille design's wall view, 0.2 mm from its window centre and 0.5 mm clear of the wall. All checks pass. A 3D model shows the board in a see-through grille or laid flat
   • What we learned: the side-looking wall camera is the only part that cannot lie flat, and its window must move 2 mm down to meet the folded camera's axis; the rim also needs a grommet for the lead from the housing. The two heat-camera chips are most of the board's cost (about $93-113 a fan at 1,000, est.), so a cheaper floor camera is a rev B option once the water tests show how many pixels the floor needs
   • What is next: the heat-camera can, the latched header and the fan's own connector from the makers' drawings, the flex bend radius, the 60 GHz rule for a ceiling device, the board in the grille CAD with its quote pack, and the next product's board, ChillOne

   See it in 3DFull research and design

3. 29 Oct 2026, 21:16From 30 November 2026 social landlords in England must also act on excess cold, falls and other hazards, not only damp and mould, and investigate a serious hazard within 10 working days (Awaab's Law phase 2). From 24 March 2027 new homes in England are designed around continuous extract fans that run without anyone switching them, with a local boost (Approved Document F, Future Homes Standard edition).

   • Market and rules check (DESIGN.md): Awaab's Law phase 2 (30 Nov 2026), the Decent Homes Standard damp rule (2035 for private rentals), the 2026 Approved Document F for new homes (from March 2027), BS 7671 Amendment 4 (no bathroom change found) and five competitors, each with what it changes in DampOne
   • New assist call: the signed record now also shows the hours the bathroom stays below 18 °C in the cold season (WHO housing guideline), from the humidity sensor and the wall heat camera already inside; a record line and an app note, never a hazard rating; no new part and no CAD change
   • New homes: the installer setting in the app locks the 8 l/s continuous trickle on, so the household changes only the boost, as the 2027 ventilation rules ask
   • Rules: two new rule lines in equipment.json, the 2026 Approved Document F and Awaab's Law phase 2
   • Competitors: Blauberg Smart Silent WiFi fan (£220.82) adds humidity, temperature and motion modes; OREiN OL05S is the first Matter bath fan in the US (about $266-300 at launch); Vent-Axia Svara and Kair unchanged; none reads the cold wall, sees water or keeps a signed record. Price kept at $349 + $2/month
   • Product page https://iemilabs.com/products/dampone/ gains an Awaab's Law FAQ and two spec lines
   • Next: ask social landlords in the phase 3 buyer review whether a cold-hours line helps their investigations, and ask a new-build electrician about the locked trickle; close-out C9 (recommend the first product to the owner) from 30 Oct 00:00

   See it in 3DFull research and design

4. 28 Oct 2026, 21:55A family in a damp home needs the fan to run until the cold corner is dry, a leak or a filling bath called, and a record a landlord will accept: today a smart humidistat fan alone is £117-130 (Vent-Axia Svara, Kair Smart Fan Plus, Oct 2026) and it only reads room humidity.

   • Buyer check with sources: what families and landlords pay today for a smart fan, damp sensors and leak pucks, and the three closest products
   • What we learned: Vent-Axia now sells a fan whose run data social landlords can see (with Switchee), and Kair a £129.99 fan that logs run time; both work from room humidity, not the cold wall, and neither calls water. For private landlords, Awaab's Law is still in consultation (to 18 Dec 2026), with 2027 the earliest start, so families and social landlords come first
   • Price kept at $349 + $2 a month, about a smart fan plus one leak sensor
   • Safer power: at full boost the fan motor and electronics needed the whole 5 W of the old supply, so we moved to a 10 W supply in the same case and the same place in the fan
   • Parts list prices checked on shop pages today: $250 of parts per fan at qty 1; cost and margin table in the design notes (about 21 % at qty 1 and 46 % at qty 100, est.)
   • Product page: the first three FAQs answer the buyer's top questions (is there a camera, why not just a smart humidistat fan, does it turn the water off), and the power and size lines match the CAD

   See it in 3DFull research and design

5. 28 Oct 2026, 05:55Damp homes need the fan to dry the cold wall where mould grows, not just the air, and need leaks found the same day. Social landlords must investigate damp and mould within 10 working days under Awaab's Law (gov.uk guidance), and the argument is usually building fault or lifestyle. Today a family buys a smart fan (Vent-Axia Svara about £115-117), a damp sensor and a leak puck, and none of them measures the cold wall.

   • New flagship DampOne: the 100 mm bathroom extractor fan made smart, at the same cut-out, Ø100 duct and 200 x 200 grille, with only 5 V below the ceiling
   • Grille rim: XIAO ESP32-S3 brain, a heat camera tilted at the outside wall and window, a heat camera looking at the floor, bath and washer, SHT45 humidity, LD2410C radar, mic, call lights, tone, ATECC608 secure element and tamper switch; 5 V supply in the housing above the ceiling
   • Makes 7 bathroom calls (5 alone, 2 assist) and says unsure below a stated confidence; equipment.json with Approved Document F and BS 7671 zone rules, calls, impact and security; bathroom plan, 7 integration parts, 5 app screens with No one home mode
   • Shared from MouldGuard (cold-wall damp record), WaterLeak (floor leak) and CycleTap (washer sound); dropped the wall probe, fan relay, leak pad and cycle puck; gaps listed: water shut-off, leaks behind walls and at the water heater (WaterLeak stays), shared laundry rooms (CycleTap stays), purifiers (PureTrack stays), other rooms
   • CAD review: 12/12 parts fit with datasheet sizes, everything out of the air path, 15 sensor views checked, no collisions, no floating parts; page at /products/dampone/, $349 + $2/month vs about $443

   See it in 3DFull research and design

6. 28 Oct 2026, 05:55One product for the bathroom, laundry and damp (owner decision, 27 Oct 2026).

   • Its jobs now run in DampOne, the smart extractor fan: /products/dampone/

   See it in 3DFull research and design

Smart equipment · legal on the field

DampOne is the bathroom ceiling extractor fan, made smart

It replaces the bathroom's existing 100 mm extractor fan (for example a Vent-Axia Svara 409802, about £115-117 in 2026), with every part built in. Everything inside the fan: the brain, 2 heat cameras, humidity sensor, radar, mic, call lights, tone, secure element and tamper switch in the sealed rim of the 200 x 200 x 30 grille, around the 110 x 110 air path; the 5 V supply in the housing above the ceiling. About +0.1 kg over the plain fan (est.); no wall sensor, relay box or floor puck.