POSTS TAGGED WITH ALARMIST

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Alarmist alarm triggered showing intruder silhouette in doorway

Your iPhone LiDAR Can Detect Motion in Complete Darkness

Every iPhone Pro has a LiDAR sensor that fires invisible infrared light and measures depth. It works in complete darkness. I turned it into a motion detection alarm for hotel rooms, dorm rooms, and anywhere you sleep in unfamiliar places.

February 6, 2026Peter Bray

Security cameras on a pole against blue sky

Alarmist

Can Your iPhone Replace a Security Camera? Camera vs LiDAR

People ask if they can use an old iPhone as a security camera. The answer is yes, but cameras fail in the dark. Your iPhone Pro has a LiDAR sensor that detects motion using infrared, no light needed. Here is when to use each one.

January 10, 2026Peter Bray

Hotel hallway with room 320 and keycard lock

Alarmist

Hotel Room Security: Sleep Safer in Hotels and Airbnbs

Hotel doors have master keys. Airbnb hosts have spare keys. Here is a practical, layered approach to securing your room at night, from physical hardware to LiDAR motion detection on your iPhone.

December 15, 2025Peter Bray