RoomOne

How it fits together

RoomOne, 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.

See the 3D CAD designShow the concept

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

1. 01

   The whole RoomOne

   The guest room's thermostat is the room's own helper: a radar chip that sees breathing and four air chips sit on our one board inside it, and the brain turns them into set back, smoke and vape, tamper, damp and clean-now calls on the thermostat's own light and one hotel app, while still driving the PTAC over its own wires.

2. 02Brain

   Our thermostat board: the ESP32-S3 radio module on its wall side

   The brain: it runs the roomone-fw program

3. 03

   Presence radar

   Sees someone in the room, a guest asleep by their breathing, the room empty, and a cover put over the thermostat

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

4. 04

   Air chips in the air corner

   Particle bursts, VOC and NOx for smoke and vape; humidity for damp; CO2 for a stuffy room; the room temperature

   Our thermostat board: the ESP32-S3 radio module on its wall side · I²C on the board (BMV080 on SPI), in the slotted air corner · PM1 to PM10, VOC and NOx index, CO2, humidity, temperature every 1 s

5. 

   05

   HVAC relays and power

   Fan, cool and heat calls to the PTAC or fan coil over its 24 VAC wires, and 5 V for the thermostat from the same wires

   Our thermostat board: the ESP32-S3 radio module on its wall side · 3 x GPIO through the relay drivers; 24 VAC to 5 V on the board · Fan, cool and heat on or off; power about 1.3 W (est.)

6. 06

   Display, keys, call light and tone

   Set point and room temperature on the e-paper, warmer and cooler keys, the call light (blue set back, amber damp or tamper, red smoke) and tones

   Our thermostat board: the ESP32-S3 radio module on its wall side · SPI (e-paper, tail soldered) + GPIO + one LED data line · Screen, key presses, light colour, tone

7. 07

   Security chip and tamper switch

   Signs every call; marks the log if the thermostat is taken off the wall

   Our thermostat board: the ESP32-S3 radio module on its wall side · I²C + GPIO; the wall-plate rib presses the switch · Signatures, tamper flag

8. 08

   All connected

   6 key parts, one program, and your phone

Our circuit board · rev A-0

One board of our own inside RoomOne

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 RoomOne work

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

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

The idea

The guest room's own thermostat sets the room back when it is really empty, records smoke and vape, dries a damp room and tells housekeeping when to clean

How the parts connect

RoomOne, 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 RoomOne

void loop() {
  Presence p = presence.update(bgt60.frame());         // in, asleep, empty, covered
  Air a = air.read();                                   // BMV080, SCD41, SGP41, SHT45
  hvac.drive(p.empty_for() > 20 * MIN ? setback(guest_sp) : guest_sp, a.rh > 65);
  for (Call c : rules(p, a, pms.status())) {
    if (c.conf < c.line) c.kind = AIR_EVENT_CHECK;   // never guess
    atecc.sign(c); face.show(c); hotel.send(c);
  }
  delay(100);
}

To your phone

How the data reaches RoomOne hotel app

The front desk, housekeeping and maintenance phones and the manager's tablet (Android and iPhone)

1. Guest-room thermostat
2. Hotel back-office Wi-Fi (WPA3) · MQTT over TLS
3. IEMI cloud (the hotel's account)
4. Push and the hotel system link (room status)
5. Front desk, housekeeping, maintenance and the manager

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing. Bought separately per room: a GuestRoom node ($329 + $8/month), a VapeSense disc ($179 + $5/month) and a networked occupancy thermostat (about $165, the Verdant VX price offered to IHG hotels, Oct 2026): about $673 + $13/month. Parts cost about $146 per room at qty 1 (checked 29 Oct 2026).

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

1. 3 Nov 2026, 22:47LatestA hotel owner reading the RoomOne page should see the guest-room thermostat as it will be sold: one flat board of our own inside it. Until now the 3D view, the parts list and the wiring still lit the bench parts (a XIAO module, an air module on a cable, a radar module, an e-paper board, key buttons, an LED stick, a buzzer and a power board), so the page showed a prototype, not the product.

   • What we designed: RoomOne rev T, the thermostat with our board inside, done the way CricketOne, AthleticsOne, RacketOne and CellOne put their boards in. Every bench part comes out and nothing bought stays: the board does every job. The thermostat gets the three changes the board asked for: the radar window is now 1.5 mm thick to suit the 60 GHz radar chip (it was 1.0 mm for the old 24 GHz module), a 6 mm particle window with a clear cover sits over the new particle sensor, and the wall plate has a small rib that presses the tamper switch on the board's back, so taking the thermostat off the wall is logged. The Wiring and Program sections now name our board: the ESP32-S3 reads the radar chip and the four air chips in the slotted air corner, and drives the relays, e-paper, keys, call light and sounder. See /products/roomone/ and /build/roomone-boards
   • How we checked it: every board part was checked in 3D against the body and the wall plate, with a 0.3 mm skin inside every wall and window. Nothing touches: the closest part is 2.7 mm from the front face and 2.9 mm from the wall plate (the wire terminal). The rib stops 0.3 mm short of the tamper switch body, so it presses only the switch's plunger. The seven radar-view checks still pass, and the assembly check shows no problems.
   • 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; RoomOne's board review now passes its "board inside the product CAD" check.
   • What is next: the same step for DampOne (the fan-grille ring), the last of the five, then the next new board (row B7 onwards).

   See it in 3DFull research and design

2. 3 Nov 2026, 18:20A hotel fits RoomOne to every guest room at once, 50 to 300 thermostats, so each must be one board an assembly house makes and tests the same way, with nothing plugged together inside and a temperature reading that is the room's, not the electronics'.

   • What we designed: one flat 128 by 98 mm board that fills the thermostat. The side facing the room carries everything that works through the front: a 60 GHz radar chip with its antennas built in, a fanless particle sensor, gas and humidity chips, the key switches, eight call-light LEDs, the sounder and the e-paper panel's soldered tail. The side facing the wall carries the radio module, CO2 sensor, three relays, the 24 VAC supply, the wire terminal and the tamper switch. It replaces the bench build's air module on a cable, radar module, display board and breakouts. See /build/roomone-boards
   • How we checked it: the board is written as code and opened in KiCad (0 design-rule violations). It places 36 parts at their datasheet sizes and checks that each fits, nothing overlaps, every part's height fits its side, the keys, radar, sounder, particle sensor, display and call light sit on their windows in the thermostat design, and the wires land inside the wall plate opening. All checks pass
   • What we learned: a thermostat's hardest board problem is reading the room, not cooling. A 1 mm slot cuts off an air corner for the temperature, humidity, gas and particle chips, 47 mm from the nearest warm part. Dropping the fan module and the radar module also halves the estimated power, to about 0.6 to 0.9 W
   • What is next: Bosch's rules for the particle sensor's flex tail and window, a side-by-side smoke and vape test of the new chips against the bench air module, the 60 GHz radar rules for each market, and the next product's board, AthleticsOne

   See it in 3DFull research and design

3. 30 Oct 2026, 01:07Hotels are charging guests $250 to more than $560 smoking fees on air-sensor alerts alone, and in 2026 news reports many were reversed: hair spray and heat tools set the sensors off, and in some cases nobody was in the room at the time (The Points Guy, February 2026; Checkbook, June 2026). Since May 2025 the FTC fees rule also asks hotels to disclose their charges clearly (Federal Register).

   • Market and rules check (DESIGN.md): four reversed smoking fees reviewed by The Points Guy, the June 2026 Checkbook report, the KOMO follow-up, the FTC Rule on Unfair or Deceptive Fees (in force 12 May 2025) and the Rest and Wynd room sensors, each with what it changes in RoomOne (sources M1-M5)
   • Smoking-fee assist: the evidence page now puts the signed air curve beside the radar presence log; room empty during the event means 'do not charge', humidity rising with the particles means 'hair styling or steam likely', and a room check comes before any fee. Still 8 calls (6 alone, 2 assist); no new part and no CAD change
   • Guest notice: the screen shows 'Air and presence sensor: no camera, no microphone' at the first key press, and the wall plate carries the same line; two new rule lines in equipment.json
   • Price kept at $349 per room + $8/mo; the demo scene and the app's evidence page now show the presence log
   • Product page https://iemilabs.com/products/roomone/ gains two FAQs (will a fee stand up, will guests know) and a fee-evidence spec
   • Next: ask hotels in the phase 3 buyer review whether evidence with the room's presence log changes how often they charge and how many chargebacks they lose; the next run checks DockOne

   See it in 3DFull research and design

4. 29 Oct 2026, 00:46A select-service hotel must set empty guest rooms back (ASHRAE 90.1, Title 24), and brands now ask for networked occupancy thermostats: IHG rooms are expected to have them by the end of 2026, at about $165 a unit from an approved vendor (Verdant pages, Oct 2026). Motion-only thermostats set back sleeping guests and record no smoke.

   • Buyer check with sources: Verdant VX at $165 for IHG owners (networked occupancy thermostats in IHG rooms, end of 2026), Telkonet EcoTouch+ with a motion sensor, Minut room sensors at about $129-150 plus a subscription
   • What we learned: brand rules are making the networked thermostat a must-buy, but none of these sees a sleeping guest by breathing or signs smoke and vape events in the same box
   • Parts list prices checked on shop pages today: $146 of parts per room at qty 1 (the 5 V regulator rose to $23.95); cost and margin table in the design notes (about 53 % at qty 1 and 68 % at qty 100, est.)
   • Price kept at $349 + $8 a month per room; the separate sum is now about $673 + $13 a month with the real networked thermostat price
   • Product page: the first three FAQs answer why not a hotel thermostat or a room sensor, what it costs, and that there is no camera or microphone
   • Next: three questions for hotels in customer reviews (brand approved-vendor lists, price against a $165 thermostat, which call pays first), then DockOne for logistics

   See it in 3DFull research and design

5. 28 Oct 2026, 09:05A hotel needs one thing in each guest room that sets the heating and cooling back when the room is really empty (as ASHRAE 90.1 and California Title 24 require within 30 minutes), records smoking and vaping with evidence, and catches damp. A smoked room costs about $620 to $1,300 to put right (Minut), and vape detectors sell for about $1,500 each (CDW).

   • Market check: who buys one product per room (select-service and extended-stay hotels), what they pay today for energy systems, vape detectors and damp checks, and the energy-code rule for empty rooms; sources in DESIGN.md
   • New CAD: the 140 x 110 x 32 mm guest-room thermostat on its wall box, with a XIAO ESP32-S3 brain, SEN66 air module, LD2410C breathing radar, 2.13 in e-paper, two keys, call light, tone, secure element, tamper switch, three HVAC relays and 24 VAC power inside; 15/15 parts fit from datasheets, 7 radar views checked, ADA reach and protrusion checks pass, no collisions, no floating parts
   • equipment.json: ADA 308, 309 and 307.2, ASHRAE 90.1 and Title 24 set back, UL 60730-2-9, no cameras or recording in guest rooms; 8 calls (6 alone), 3 impact cases and every security key
   • idea.json room plan, integration.json (5 parts, 5 app screens with a night mode for when no staff are on the floor), bom.csv (about $142 a room), buy.json with 9 key parts
   • New product page at /products/roomone/ in Facilities: $349 + $8/room/month against about $658 + $13/room/month bought separately (est.); folds GuestRoom and VapeSense; laundry, leaks, back-of-house floors and care stay with their own zones; next: F9 Logistics and warehouses

   See it in 3DFull research and design

6. 28 Oct 2026, 09:05A hotel needs one thing in each guest room that sets the heating and cooling back when the room is really empty (as ASHRAE 90.1 and California Title 24 require within 30 minutes), records smoking and vaping with evidence, and catches damp. A smoked room costs about $620 to $1,300 to put right (Minut), and vape detectors sell for about $1,500 each (CDW).

   • Now part of RoomOne: https://iemilabs.com/products/roomone/

   See it in 3DFull research and design

7. 28 Oct 2026, 09:05A hotel needs one thing in each guest room that sets the heating and cooling back when the room is really empty (as ASHRAE 90.1 and California Title 24 require within 30 minutes), records smoking and vaping with evidence, and catches damp. A smoked room costs about $620 to $1,300 to put right (Minut), and vape detectors sell for about $1,500 each (CDW).

   • Now part of RoomOne: https://iemilabs.com/products/roomone/

   See it in 3DFull research and design

Smart equipment · legal on the field

RoomOne is the the hotel guest room's wall thermostat by the entry: a 140 x 110 x 32 mm unit on a single-gang wall box, made smart

It replaces the room's existing guest-room thermostat, on the same wall box and the same wires, with every part built in. Everything inside the thermostat: brain, air module, radar, e-paper, keys, call light, tone, secure element, tamper switch, relays and power on one carrier board. About 210 g (est.), the same outline as a plain guest-room thermostat; no ceiling disc, plug-in box or camera.