Why I Ditched My Motion Sensors for a Milesight Presence Detector

Motion sensors in my workshop and ham shack have been a low-grade annoyance for years. Sit still long enough at the bench — soldering, logging a contact, reading a datasheet — and the lights cut out because you haven't moved dramatically enough for the PIR to care. That cycle of arm-waving and wall-switch hunting gets old fast. So I started looking at human presence sensors, and the Milesight VS370 ended up on my workbench. It fixed the problem completely.

The limitation of a standard PIR (passive infrared) motion sensor is baked into the name: it detects motion, not presence. PIR sensors work by sensing rapid changes in infrared radiation as a warm body moves through the detection zone. Stop moving, and as far as the sensor is concerned, you've left the room. That's fine for a hallway or a bathroom — in and out, lights follow. But for any space where you actually sit down and work, it falls apart immediately. You're still there, just not waving your arms.

The VS370 takes a different approach. It pairs a 24GHz millimeter-wave radar with a conventional PIR sensor. The radar doesn't need movement — it bounces off a stationary person and picks up the micro-motions you can't suppress: breathing, subtle weight shifts, minor hand or head movements. The detection range goes out to around 5 meters with configurable sensitivity zones, so you can tune it to cover just your workspace without triggering on someone walking past in the hallway. It also reports occupancy state cleanly — not just a motion pulse, but a persistent "someone is here" signal until the space is actually empty.

For light triggering, I'm running the VS370 over LoRaWAN into Home Assistant through a Milesight UG65 gateway. The automation is dead simple: when occupancy is true, lights on; when occupancy is false, lights off after a short delay. You can wire it into anything that speaks MQTT or a REST API — Home Assistant, Node-RED, or even a direct integration with a Zigbee or Z-Wave controller if you bridge it. The behavior in practice is exactly what you'd want: sit at the radio for two hours barely moving and the lights stay on. Get up and walk out and they go off in under a minute.

The VS370 runs around $60–80 depending on your supplier, which is real money compared to a $10 PIR sensor. But the use case matters. For hallways, entryways, closets — motion detection is the right tool and a cheap PIR is perfect. For spaces where you actually occupy and work — shop, shack, home office — a presence sensor earns its keep fast. If you've ever rage-waved at a ceiling sensor in the middle of something delicate, you already know the upgrade is worth it.