Support a fire evacuation without delaying the alarm
When a listed smoke or carbon-monoxide alarm activates, optional lighting and notifications run immediately without changing the alarm, delaying evacuation, or declaring an all-clear.
Best for: Adding supplemental path lighting and household notifications to a code-compliant alarm and evacuation plan.
Not for: Replacing listed alarms, monitored systems, practiced escape routes, or instructions from emergency services.
Why this exists
A smart home can make an alarm easier to notice, especially at night. It must not become part of the life-safety decision. The installed alarms, clear exits, and the household evacuation plan still work when the hub, power, or internet is unavailable.
This recipe deliberately excludes automatic door unlocking, irrigation, alarm delays, and automatic all-clear messages.
What I used
| Job | Good enough | Never think about it | Notes |
|---|---|---|---|
| Detect smoke and carbon monoxide | Listed alarms installed and maintained for the home | Professionally designed or monitored alarm system where appropriate | Follow local requirements and the alarm manufacturer’s placement, interconnection, testing, and replacement instructions. |
| Expose an alarm event to the hub | No personally verified recommendation yet | Manufacturer-supported integration or a listed listener approved for the installed alarm type | Failure of the integration must not affect the alarms. |
| Light an exit path | Existing fixed lights with working wall controls | No personally verified recommendation yet | Lighting is supplemental. People must know the exits in darkness. |
| Reach the household | Alarm sound and practiced evacuation plan | Supplemental phone alerts to responsible adults | A phone notification is not the primary warning. |
Do not add an unlisted relay, microphone, or modification to alarm wiring. Use only equipment and installation methods approved for the installed alarm system.
Logic
- Trigger: A supported alarm integration reports smoke or carbon monoxide.
- Conditions: None. Do not add mode, time, occupancy, or multi-sensor confirmation conditions.
- Action: Turn on fixed path and exterior lights that are safe to operate, then send a supplemental alert naming the reported alarm.
- Wait / timeout: None before the first response.
- Stop condition: A responsible person manually resets the supplemental response after emergency services or a qualified person says it is safe.
- Manual override: Wall switches, normal locks, alarm controls, and exits remain usable without the hub.
Setup notes
- Install, place, interconnect, test, and replace alarms according to local requirements and manufacturer instructions.
- Practice an evacuation plan with two ways out where possible and a meeting place outside.
- Confirm every person can operate the normal locks and exits without the smart home.
- Add only lights that cannot create a new hazard or obscure alarm indicators.
- Keep the first alert unconditional and name the alarm location exactly as a person understands it.
- Treat unavailable, stale, or disconnected integration data as a maintenance problem.
- Require a manual reset. A stopped alarm or clear reading is not proof that re-entry is safe.
Test without creating smoke
Use the alarm manufacturer’s test procedure. Do not use open flame, burning material, or an improvised aerosol test.
During a planned household test:
- Confirm the physical alarms remain loud and interconnected without the hub.
- Confirm path lights turn on without changing the alarms.
- Confirm alerts identify the correct reported location.
- Disconnect the internet and repeat any behavior expected to remain local.
- Verify that no rule unlocks doors, starts irrigation, delays a response, or sends an all-clear.
- Practice leaving the home and meeting outside.
Advanced features
Report integration health
Create a separate maintenance alert when an alarm integration or listener becomes unavailable. Do not represent missing data as “safe.”
Keep intrusion response separate
Glass-break and intrusion events have different risks and actions. Do not combine them with fire logic.
Failure modes
- The hub misses the event: The physical alarms and evacuation plan remain primary. Repair the integration before relying on supplemental actions.
- A light does not turn on: Repair it, but do not let one failed light block the rest of the response.
- A phone is muted or offline: The installed alarms still provide the primary warning.
- The wrong location appears: Rename and retest the integration so the message does not send someone toward danger.
- The alarm stops: Keep the supplemental incident open until a person with authority at the scene clears it.
- Power or internet fails: Battery-backed alarms and practiced exits must still work.
Done when
- The installed alarms meet local requirements and pass their manufacturer test.
- Everyone can leave through normal exits without the hub or phone.
- Supplemental lights and messages run immediately from the supported alarm event.
- The first response has no time, mode, occupancy, or confirmation condition.
- No automation unlocks doors, starts irrigation, or declares an all-clear.
- Missing integration data creates a maintenance alert.
- The household has practiced the evacuation plan and meeting place.
FAQ
Should a smart-home rule wait for a second smoke alarm before responding?
No. Never delay an alarm, evacuation, or emergency call while waiting for another sensor. Any automation is supplemental to the installed smoke and carbon-monoxide alarms.
Should fire automation unlock every exterior door?
No. Automatic unlocking can create security and fire-separation problems. Make sure everyone can operate the normal locks and exits without relying on the hub.
Can the automation announce that the house is safe again?
No. A clear sensor or stopped alarm is not an all-clear. Only emergency services or a qualified person at the scene should make that decision.