Mamori conceptFull kitProduct spec
2 · Product spec
The soft fabric cube on an oak base, and what it is designed to do.
Concept, to be validated in the prototype. Nothing here is tested.
The concept look: a soft off-white fabric cube on a light oak base, a round display in a clear disc on the front, a small white help button on top. Dimensions are from the updated concept model and diagrams; all are concept values, to be validated in the prototype.
| Item | Concept |
|---|---|
| Body | soft off-white fabric cube; the fabric is also the speaker grille |
| Footprint | about 90 mm across (concept) |
| Height | about 89 mm (concept) |
| Base | solid oak, 24 mm tall (concept); nano-SIM tray underneath |
| Front display | round display about 30 mm in a 40 mm clear disc (concept), with an RGB ring around it; shows one word: Private / Mic on / Help called |
| Help button | 24 mm white button on top with a thin persimmon edge (concept) |
| Shutter | mic shutter on the right side; closed = mic covered and unpowered |
| Mic LED | next to the shutter on the right side |
| Weight | to be measured on the prototype |
| Part | Material |
|---|---|
| Outer cover | soft off-white acoustic fabric; it is the speaker grille, so it must let sound through and not block the radios |
| Inner shell | injection-moulded ABS (prototype: 3D printed); carries the fabric, the speaker chamber, the display disc, the button well, the shutter and the antennas |
| Base | solid oak, oiled satin finish; SIM tray opening underneath |
| Display disc | clear disc over the round display, with a light guide for the RGB ring (materials to select) |
| Help button | white cap with a thin persimmon edge (material to select) |
| Shutter knob | material to select; any metal kept away from the antennas |
1 · Emergency warning
One button on top. A press would sound a local alarm, speak “Help called”, turn the ring red and show “Help called” on the round display; if a family device is paired, an alert would go there over Wi-Fi or the cellular link.
Limit: Only helps if the button can be reached. Not an emergency service; no promised response. Needs power and a network for the alert.
2 · Room air
PM2.5, CO2, VOC, temperature and humidity near a rear air intake, spoken in plain words (“air looks stale”, “room is cold”) and sent as optional short summaries.
Limit: Room air readings, not health measurements. Low-cost sensors drift and need calibration; heat near the sensors skews readings.
3 · Possible-fall flag (target)
Wi-Fi sensing is built in: the device’s own Wi-Fi radio reads changes in the Wi-Fi channel (CSI) to sense motion in the room. It is designed to flag a possible fall (a target, to be validated in the pilot) and pass the flag to the paired device. A partner’s separate sensor becomes optional.
Limit: A design target, not validated, not a medical function. It may miss real falls or raise false ones; results depend on the room, furniture and router.
4 · It speaks and listens
A speaker behind the fabric and a voice assistant: a wake word is heard on the device, then the request goes to a cloud speech service. Calls with a paired family device too; the ring turns amber and the display says “Mic on”.
Limit: Listening, the assistant and calls work only with the shutter open. The cloud speech service needs a network and has its own terms.
5 · Privacy by hardware
No camera, no image sensor. A physical shutter covers the mic and cuts its power; the mic LED sits on the mic’s power line. With the shutter closed it cannot hear, but it can still speak alerts. Ring and word: green = Private, amber = Mic on, red = Help called.
Limit: The circuit needs an independent check before anyone relies on it. Wi-Fi sensing works without the mic, so it is not stopped by the shutter: it needs its own clear on/off and indicator.
The main electronic blocks. Candidate part numbers are on the Parts and Costs pages.
| Block | Concept |
|---|---|
| Main processor + Wi-Fi / Bluetooth LE | one pre-certified module; also runs the Wi-Fi sensing (CSI) and the wake word on the device |
| Cellular | LTE-M or LTE Cat-1 module with Japan bands, nano-SIM (tray under the base) or eSIM, own antenna |
| Audio | MEMS microphone (power switched by the shutter), class-D amplifier, speaker in a closed chamber behind the fabric |
| Air sensors | PM2.5 / VOC / NOx / humidity / temperature combo and a CO2 sensor at the rear intake |
| Display and light | small round display (about 30 mm, module to select) behind a clear disc, RGB ring around it, mic LED |
| Help button | a switch under the top button |
| Privacy circuit | shutter slide switch → mic power (load switch, no software path) → mic and mic LED |
| Power | USB-C in, 3.3 V regulation, reserve for cellular peak current; battery backup to decide |
| Interface | Concept | Open point |
|---|---|---|
| Wi-Fi | 2.4 GHz Wi-Fi to a paired family device over the internet; the same radio does the Wi-Fi sensing | how sensing behaves with different home routers |
| Cellular | LTE-M or LTE Cat-1, Japan bands, so it works without home Wi-Fi | LTE-M or Cat-1, SIM or eSIM, operator: to decide |
| Bluetooth LE | maybe, only for first-time setup and pairing | to decide in the prototype |
| Voice | on-device wake word, then cloud speech; speaker for answers and spoken alerts | speech service and its data terms: to choose |
| USB-C | power in | whether it also serves for service updates |
| On the device | help button, shutter, round display with RGB ring, mic LED, speaker | one-word display: wording and size for older eyes |
| Partner sensor | optional: a fall-event signal from a partner’s separate wifi sensing sensor | interface and terms, if used |
The shutter knob drives a slide switch. Closed, it covers the mic opening and opens the mic’s power path. No software path can turn it back on.
The mic LED is wired on the mic’s switched power line (in series in the concept), so the mic is intended to be unable to work without the LED lit. Series wiring or the same switched rail: to decide in the prototype; either way the rule is checked on every unit.
No wake word, no voice assistant, no call with the shutter closed. It can still speak alerts, and the help button and local alarm still work.
The wake word is heard on the device; only then is the request sent to the cloud speech service. Design intent: no audio kept on the device; what the speech service keeps is set by its terms and must be checked.
It senses motion from Wi-Fi signals, not sound or images. Design intent: the raw sensing data stays on the device and only a possible-fall flag is sent. It needs its own on/off and a visible state.
No camera, no lens, no image sensor anywhere in the device.
The circuit needs an independent review of the schematic and the board before anyone relies on it.