Recently I came across a review-advertisement of a new motion sensor Mi Human (Motion) Sensor 2. Without thinking twice, I went to Ali and bought it there ... Xiaomi Aqara Motion Sensor, the same, but it connects to the smart home system not via WiFi but via Zigbee, in theory, much less power consumption. I took two pieces, one inside the house, so that I could sleep more calmly, the second outside, right in front of the door at the threshold, so that the bell would ring in the house and the light would light up when the cat came to the door (there is no cat door). Included is a plastic leg with a hinge with an adhesive layer on both sides, and a spare Velcro circle, on the bottom of the sensor "barrel" there is a rubber ring for stability The sensors are designed to work with Xiaomi Gateway, but in order not to send unnecessary information to our Chinese brothers, and not to use a crooked Chinese application, you can build your system based on Home Assistant and zigbee2mqtt. Just such a system I have assembled, everything connected without problems - we allow the connection of zigbee devices in the system, hold the only button on the sensor for 3 seconds - the sensor blinks a blue LED and appears in the list of devices, then we do whatever we want with it. The LED does NOT blink when motion is detected, only when a button is pressed. A person is determined somewhere from three meters, and even if only part of the body is in the visibility zone, but difficulties arose with the cat. The sensor is infrared, and a small fluffy cat in the cold can only be detected from a close distance (less than 1 meter), I had to place the sensor closer to the place where it usually sits and waits until you open the door. The viewing angle in practice is about 140 (declared 170). the battery is already in place, both sensors show 100% charge after connection. Despite the communication level "0 lqi", the sensor still works stably. Both sensors are separated from the hub by a wall of aerated concrete, at a distance of about 10 meters, one is practically on the floor, the second is at chest level. triggers immediately, but not more than once a minute, which means that after detecting movement, the sensor will show for a minute that there is movement, even if the movement was only a second. "from -10C" - we also have -30, let's see how this affects its operation and durability, but in theory only the battery can get worse.
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