Room patrol + motion alert

Goal: Loop a living-room waypoint path, compare camera snapshots, and ping you when something meaningful changed.

Hardware checklist

• [ ] TurtleBot 3/4, Yahboom/Hiwonder ROS 2 kit, or Pi DIY differential drive
• [ ] Forward-facing USB or CSI camera
• [ ] Mapped apartment (see map-apartment-once kit)
• [ ] Phone/Telegram/Discord webhook for alerts
• [ ] Physical e-stop or easy power cut

30-minute path

1. Simulate first — launch your Nav2 + camera stack in Gazebo; verify waypoints.
2. Define 3–5 poses around the room in waypoints.yaml (stay 40cm from furniture).
3. Baseline capture — run once with --baseline to store reference frames per pose.
4. Diff loop — at each stop, capture, absdiff vs baseline, ignore blobs smaller than a pet-threshold.
5. Alert — POST a short message + thumbnail to your webhook when change exceeds threshold.
6. Schedule — cron or a systemd timer every N minutes; skip if battery < 30%.

Safety

• Never run unattended until you've watched 3 full loops.
• Motion alerts are not a security system.
• Slow speeds only; no stairs.

Files in this kit

• kit.yaml — platform + deps + safety metadata
• agent-skill.md — prompt for an AI agent to help you install