GuestRoom

How it fits together

GuestRoom, 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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1. 01

   The whole GuestRoom

   One ceiling disc with one ESP32-C6 runs three room jobs: it smells the air for smoke and vapes, sets the AC back when a radar says the room is really empty, and watches a cold bathroom wall for mould risk, all on the owner's Wi-Fi to one app.

2. 02Brain

   ESP32-C6-MINI-1 (disc PCB)

   The brain: it runs the guestroom firmware program

3. 03

   SEN66 air module

   Measures fine particles, VOC, NOx, CO₂, humidity and temperature once a second

   ESP32-C6-MINI-1 (disc PCB) · I²C (6-pin cable) · 1 Hz air readings

4. 04

   BME690 gas sensor

   Scans gas response to tell vapes from shower steam and sprays

   ESP32-C6-MINI-1 (disc PCB) · I²C (shared bus) · Gas resistance profile

5. 

   05

   Presence radar

   Sees a guest even lying still in bed, so the AC is set back only in an empty room

   ESP32-C6-MINI-1 (disc PCB) · UART over the 6-core pod lead · Moving and still presence, distance

6. 

   06

   IR LEDs to the AC

   Send the AC's own remote codes: set back, dry mode, back to the guest's setting

   ESP32-C6-MINI-1 (disc PCB) · GPIO + MOSFET on the pod PCB, over the pod lead · 38 kHz IR remote frames

7. 07

   IR receiver

   Learns the AC remote at install and hears what the guest sets

   ESP32-C6-MINI-1 (disc PCB) · GPIO (RMT receive) over the pod lead · The guest's set point and mode

8. 

   08

   Bathroom wall tag

   SHT45 air reading and an NTC bead on the coldest wall give the wall's own humidity

   ESP32-C6-MINI-1 (disc PCB) · I²C + NTC on a 3 m 6-core flat cable · Wall surface temperature, air RH/T

9. 09

   All connected

   7 key parts, one program, and your phone

How the parts connect

GuestRoom, 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 GuestRoom

for (;;) {
    sen66_read(&air); radar_read(&occ);          // 1 Hz
    vape_step(&ev, &air, &gas);                   // VapeSense detector + trees
    if (ev.done) uplink_event(&ev);
    empty_s = occ.present ? 0 : empty_s + 1;
    if (empty_s == 20 * 60) ir_send(ac.setback);  // learned AirMate codes
    if (occ.present && empty_s == 0 && ac.set_back) ir_send(ac.guest);
    if (tick % 60 == 0) {
        wall = walltag_read();                    // SHT45 + NTC
        float srh = surface_rh(&air, wall.t_surf);
        if (srh > 70 && !occ.present) ir_send(ac.dry);
        damp_log(srh);
    }
    if (tick % 300 == 0) uplink_summary();
    vTaskDelay(pdMS_TO_TICKS(1000)); tick++;
}

To your phone

How the data reaches GuestRoom

Manager's phone and browser; housekeeping tablet

1. Ceiling disc
2. Wi-Fi 6 on the owner's IoT network
3. Property router
4. MQTT over TLS
5. IEMI cloud
6. Web app and push
7. Manager's phone

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing. For one room, our three products bought separately (AirMate IR $49, VapeSense $449 + $12/month, MouldGuard $49 + $1.50/month) add up to about $547 + $13.50/month. Parts cost about $116 a room at qty 1 (est.).

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

1. 28 Oct 2026, 09:05LatestA 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

2. 27 Oct 2026, 11:15A small hotel, motel or rental host has three room problems sold separately: smoking in non-smoking rooms ($620–1,300 an incident, Minut), ACs cooling empty rooms (occupancy setback worth up to about $180 a room a year, vendor-reported by Onity, and a BPA study found guests and housekeeping undo plain sensors), and damp bathrooms in humid places where in-room ACs dry poorly (mould repairs $500–10,000+ a room, Hospitality Net). Our own three products for it cost about $547 and $13.50 a month a room.

   • New product GuestRoom: one ceiling disc with one ESP32-C6 brain, one Wi-Fi link and one USB-C supply does the jobs of VapeSense, AirMate IR and MouldGuard in a guest room, with one app
   • Reused CAD parts unchanged: VapeSense's disc base, cover, twist-lock plate, sensor duct and cable guard; MouldGuard's bathroom wall tag. New: an AC pod (base and lid) beside the disc with the radar behind a 0.9 mm window and four IR LEDs and an IR receiver behind a window facing the AC. 8 printed parts, each one solid, every bought part fits
   • 3D view: a guest-room ceiling with the disc and pod, the wall AC, the bed, and the wall tag high in the bathroom with its cable over the door
   • Dropped: VapeSense's LoRa radio and building gateway (hotels use their own Wi-Fi), AirMate's own chip, humidity sensor and case, and MouldGuard's weighing board, screen and smart plug (the AC's dry mode does the drying)
   • Product page https://iemilabs.com/products/guestroom/: $329 + $8/month a room instead of about $547 + $13.50/month; parts about $116 a room at quantity 1 (est.)

   See it in 3DFull research and design

3. 27 Oct 2026, 11:15A small hotel, motel or rental host has three room problems sold separately: smoking in non-smoking rooms ($620–1,300 an incident, Minut), ACs cooling empty rooms (occupancy setback worth up to about $180 a room a year, vendor-reported by Onity, and a BPA study found guests and housekeeping undo plain sensors), and damp bathrooms in humid places where in-room ACs dry poorly (mould repairs $500–10,000+ a room, Hospitality Net). Our own three products for it cost about $547 and $13.50 a month a room.

   • Combined into GuestRoom (https://iemilabs.com/products/guestroom/); VapeSense itself is unchanged

   See it in 3DFull research and design

4. 27 Oct 2026, 11:15A small hotel, motel or rental host has three room problems sold separately: smoking in non-smoking rooms ($620–1,300 an incident, Minut), ACs cooling empty rooms (occupancy setback worth up to about $180 a room a year, vendor-reported by Onity, and a BPA study found guests and housekeeping undo plain sensors), and damp bathrooms in humid places where in-room ACs dry poorly (mould repairs $500–10,000+ a room, Hospitality Net). Our own three products for it cost about $547 and $13.50 a month a room.

   • Combined into GuestRoom (https://iemilabs.com/products/guestroom/); AirMate IR itself is unchanged

   See it in 3DFull research and design

5. 27 Oct 2026, 11:15A small hotel, motel or rental host has three room problems sold separately: smoking in non-smoking rooms ($620–1,300 an incident, Minut), ACs cooling empty rooms (occupancy setback worth up to about $180 a room a year, vendor-reported by Onity, and a BPA study found guests and housekeeping undo plain sensors), and damp bathrooms in humid places where in-room ACs dry poorly (mould repairs $500–10,000+ a room, Hospitality Net). Our own three products for it cost about $547 and $13.50 a month a room.

   • Combined into GuestRoom (https://iemilabs.com/products/guestroom/); MouldGuard itself is unchanged

   See it in 3DFull research and design