Introduction
Smart bathrooms use sensors to automate lighting, ventilation, and even hygiene features. PIR sensors play a key role in detecting occupancy and triggering these functions.
Applications in Bathrooms
Occupancy Detection
Detect when someone enters the bathroom. Used for turning on lights, activating ventilation fans, and displaying “occupied” sign outside.
Lighting Control
Lights turn on when motion detected, turn off after period of inactivity (with sufficient delay to avoid turning off while using toilet).
Ventilation Control
Fan turns on when occupancy detected and runs for set time after exit to remove odors and moisture.
Special Considerations for Bathrooms
Humidity and Steam
Bathrooms have high humidity and steam, which can condense on lens and block IR. Use sensors with conformal coating or IP-rated enclosures.
False Triggers from Water Flow
Running water can cause temperature changes that may trigger sensor. Proper placement away from direct water spray helps.
Privacy
PIR sensors are privacy-preserving – they don’t capture images, making them ideal for bathrooms.
Conclusion
PIR sensors make bathrooms smarter, more energy-efficient, and more hygienic.