A smart lock is an electronic lock that can be controlled remotely or automatically using a smartphone, voice assistant, or smart home platform. It replaces or augments your existing door lock to enable keyless entry, access control, and automation.
How It Works
Smart locks typically contain:
- Motorized mechanism to engage/disengage the deadbolt or latch
- Wireless radio for communication (Bluetooth, Wi-Fi, Zigbee, Z-Wave, Thread, etc.)
- Authentication methods (PIN pads, fingerprint, NFC, app, voice, etc.)
- Sensors to detect lock state (locked/unlocked, door open/closed)
| Type | Description | Example |
|---|
| Retrofit | Mounts over or replaces interior thumb turn only; keeps existing key | August, SwitchBot Lock |
| Full Replacement | Replaces full deadbolt or latch; includes new exterior hardware | Yale Assure, Schlage Encode |
| Latch-Based | Often for interior doors; replaces handle or knob | Aqara U100, Level Lock |
| Mortise | For mortise lock bodies (common in EU/Asia) | Nuki, Tedee |
Security Considerations
| Concern | Mitigation |
|---|
| Hacking / Spoofing | Use encrypted protocols (Thread, Zigbee, Matter) |
| Power failure | Use locks with key override or rechargeable battery |
| Remote access abuse | Enable 2FA on your account; log access events |
| Physical tampering | Choose ANSI Grade 1 or 2 certified hardware |
| Auto-unlock fails | Use geofencing + nearby Bluetooth detection combo |
Installation Tips
- Check compatibility: Make sure your door and deadbolt fit the lock model.
- Battery access: Choose models with easy battery replacement.
- Calibration: Some locks require setup to know “locked” vs “unlocked” position.
- Test physical key: Always keep a backup key accessible.
- Don’t block door alignment: Poor fitting can cause false reports or motor strain.
Uses & Ideas
- Automated Locking: Auto-lock door at 10 PM or when everyone leves
- Geo-unlock: Door unlocks as you approach with your phone
- Guest Access: Create temporary PINs or NFC keys for Airbnb guests
- Package Security: Unlock door when delivery is detected and relock after
- Alarm Integration: Auto-lock doors when security system is armed
- Vacation Mode: Disable auto-unlock, require manual unlock only
| Brand / Model | Platform Support | Protocol | Power | Notable Features | Tested | Link |
|---|
| Aqara Motion P1 | HomeKit, HA | Zigbee | Battery | Small, fast, adjustable timeout | ✅ | Buy |
| Philips Hue Motion | HomeKit, Hue Bridge | Zigbee | Battery | Light sensor, good integration | ✅ | Buy |
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