Fire It watches for smoke and carbon monoxide, sounds a horn, and tells you out loud which one it found. When it’s just burnt toast, you silence it without a chair or a broom handle.
snoozeor
stop
Burnt toast, not a fire
snooze. Or tap your phone.
Nobody should have to climb a chair and wave a towel at the ceiling. Fire It hushes a false alarm two ways, without leaving the stove.
01 · Microphone
“SNOOZE”“STOP”
Either word hushes the horn. A MEMS microphone listens for them only while the alarm is sounding. Recognition runs on the alarm itself: no cloud, no recording, nothing streamed. A notch filter removes the horn’s own 3.1 kHz tone so the alarm can’t hear itself.
02 · Wi-Fi
The alarm runs its own small Wi-Fi network with a control page. Join it from your phone, the page opens, and you press Snooze. No app to install and no account. It can also email you a note that it was snoozed, sent from your own mail app.
Running today on our ESP32 bench prototype. The round board carries a dedicated Wi-Fi module for it.
shopand
topfor
stop, which is the next thing we’re fixing.
A snooze is temporary, and the button on the alarm always works. The rules for how long a hush lasts, and whether a carbon monoxide alarm may be hushed at all, come from the UL standards we still have to pass, so those are design targets, not tested features.
59%of US home fire deaths happened where there was no smoke alarm or it didn’t work. NFPA, 2018–22
33%of households never test their smoke alarms. NFPA / CPSC survey
Alarms get disabled because they shriek at a frying pan, and they get ignored because a chirp doesn’t tell you what’s wrong. Fire It is built around those two failures: tell steam from smoke, and say plainly what it found.
These are the real parts on our prototype board. They’re named so you can look them up. Specs will change as we test.
Analog Devices ADPD188BI
Two wavelengths of light, blue and infrared, look at what drifts into the chamber. Comparing them is how an optical sensor tells smoke apart from steam and dust, which is what makes most kitchen false alarms.
SPEC 110-102 + TI LMP91000
An electrochemical cell, the type used in CO alarms, read by a dedicated low-noise front end. It sits behind its own nine-hole grille so gas reaches it without dust.
Piezo sounder + 8 Ω speaker
A piezo horn for the alarm itself, and a separate speaker that says which danger it is: smoke, or carbon monoxide. Our target is 85 dBA at 3 m. We haven’t measured that through the final cover yet.
INMP441 MEMS mic + Wi-Fi radio
A digital microphone that only matters while the horn is sounding, and a Wi-Fi radio so the alarm can be hushed from your phone. On the working prototype both run on an ESP32. On the round board, Wi-Fi is an ATWINC1510 module and the microphone still has to be added.
USB-C + CR123A backup
USB-C power with a primary lithium cell in a side drawer as backup. Whether this power arrangement is acceptable for a home installation is one of the open questions we have to settle with a test lab.
No incumbent shows you this. We’d rather you know exactly what’s done, and that the answer is “not much is certified yet”. We update this table as things pass or fail.
| Gate | What has to be true | State | |
|---|---|---|---|
| Smoke sensing | Not tested | Chamber airflow, fire and nuisance test suite, ageing, drift | Not tested |
| CO sensing | Not tested | Calibration gases, response time, interference, end of life | Not tested |
| Alarm sound | Not tested | Measured sound level, temporal patterns, voice priority | Not tested |
| Circuit board | In progress | Schematic synchronised, routed, design-rule clean | In progress |
| Enclosure | Drawn | Five-part round housing, printable for fit checks | Drawn |
| Voice snooze | Prototyped | “Snooze” / “stop” detection on the device, tested on voices it never trained on; microphone added to the round board | Prototyped |
| Phone snooze | Prototyped | Wi-Fi hush from a phone page, then hush time limits that meet the alarm standards | Prototyped |
| Certification | Not started | UL 217 (smoke) and UL 2034 (CO); California State Fire Marshal listing | Not started |
Fire It isn’t for sale until it’s certified. Reserve now and you’ll be first in line, with no payment and no obligation. Your answers help us decide which rooms to design for first.