Living Room Smoke Detector

Simple smoke/fire detector for living room. Queries Dirigera air sensor every 5 minutes, detects dangerous PM2.5 over 250 or CO2 over 2000 levels, and broadcasts emergency alert on Mac speaker continuously until air quality normalizes. Acts as backup to regular smoke alarms.

A simple, focused smoke and fire detection system that monitors the living room ALPSTUGA air sensor via the Dirigera hub.

What It Does

• Queries Dirigera directly every 5 minutes (not from database)
• Simple state only - keeps just the latest reading, no history
• Detects danger: PM2.5 > 250 µg/m³ OR CO2 > 2000 ppm
• Continuous alert - plays "Attention! Abnormal smoke level detected" on Mac speaker
• Loops until cleared - keeps playing every 5 seconds until air quality normalizes
• Backup smoke alarm - works alongside your regular smoke detector

Setup

1. Copy Alert Sound (optional)

If you already have the alert sound from the air monitor skill:

cp ~/.openclaw/workspace/skills/living-room-air-monitor/data/smoke_alert_message.mp3 \
   ~/.openclaw/workspace/skills/living-room-smoke-detector/data/alert.mp3

Otherwise it will auto-generate on first run.

2. Cron Setup

Add to crontab to check every 5 minutes:

*/5 * * * * /opt/homebrew/bin/python3 /Users/macmini/.openclaw/workspace/skills/living-room-smoke-detector/scripts/smoke_detector.py >> /tmp/smoke_detector.log 2>&1

Usage

Manual Check

python3 ~/.openclaw/workspace/skills/living-room-smoke-detector/scripts/smoke_detector.py

View Status

# Latest reading
cat ~/.openclaw/workspace/skills/living-room-smoke-detector/data/detector_state.json

# Log
tail -f /tmp/smoke_detector.log

How It Works

1. Cron triggers every 5 minutes
2. Fetches data directly from Dirigera hub
3. Checks thresholds:
   • PM2.5 > 250 µg/m³ (smoke particles)
   • CO2 > 2000 ppm (combustion byproduct)
4. If danger detected:
   • Saves state (alert_active = true)
   • Enters alert loop
   • Plays alert sound every 5 seconds
   • Re-checks sensor between plays
   • Exits loop when air clears
5. If normal: Updates state and exits

State File

data/detector_state.json:

{
  "latest_reading": {
    "pm25": 3,
    "co2": 525,
    "time": "2026-02-25T20:30:00"
  },
  "alert_active": false,
  "last_check": "2026-02-25T20:30:00"
}

Alert Behavior

When danger is detected:

• Mac speaker plays: "Attention! Abnormal smoke level detected"
• Waits 5 seconds
• Checks sensor again
• Repeats until PM2.5 ≤ 250 AND CO2 ≤ 2000
• Press Ctrl+C to stop manually if needed

Files

File	Purpose
scripts/smoke_detector.py	Main detection script
data/alert.mp3	Alert sound file
data/detector_state.json	Latest reading and status

Dependencies

• Python 3.x
• Dirigera hub access (192.168.1.100)
• Auth token at ~/.openclaw/workspace/.dirigera_token
• macOS afplay (built-in)
• say and ffmpeg (for alert generation)

Differences from Air Monitor Skill

Feature	Air Monitor	Smoke Detector
Data storage	Full SQLite database	Latest reading only
Query source	Database	Dirigera directly
Frequency	Every 2 min	Every 5 min
Purpose	History + charts	Immediate alerting
Alert	Single play	Continuous loop
Complexity	Multi-feature	Single-purpose

Use both for complete coverage: air monitor for data logging, smoke detector for focused alerting.