They’re quite good. Better than I expected, honestly. They last quite some time on a single battery, but it’s not a 2032 (like on PC motherboards) it’s a somewhat beefier CR2450 coin cell. Typically, battery lifetime is about 9 months to a year. I can only presume they sleep until woken by movement.
Nice! Thanks for letting me know 
Does anybody can recommend an outdoor motion sensor?
I have conbee Stick an my hassio and hue bridge here.
Thanks
The best zigbee outdoor motion sensor for me is the Philips Hue PIR Outdoor.
Note the cheapest but well built, gives occupancy, temperature and illuminance, 3 levels of motion sensitivty and batteries last forever…
Thanks, bought 2 of them, worked great!
Hi There… re your recommendation of the Philips Hue PIR Outdoor sensor. Do they require a Philips Hue hub? And if not, what zigbee hub do you recommend? I really dont want to buy a hue hub 
Any stick supported by Zigbee2mqtt or ZHA will do. You don’t need/want a hue hub.
My Hue motion sensors work way better since they aren’t connected anymore to the Hue hub but to a Conbee 2 stick.
Hey, I can offer my experience on Wyze motion sensors.
The first generation of what Wyze calls “WyzeSense” is no longer available but on ebay they are easily found for ~$20us each. Please note you WILL NEED A NEW BATTERY. These are old enough that the battery they shipped with is almost dead and will die within minutes the first time you use it.
These originally had a small RF bridge plugged in to the back of the Wyze camera (which also works in HA) which listens for the sensors. So you have a dongle in the back of your PI and you put the tiny sensor anywhere you want. In my single story 2000sqft home, there are no dead spots for this 400mhz service.
To integrate, you’ll need the Wyze Sense Component from HACS, then edit configuration.yaml and add:
sonoff:
username: [email protected]
password: yourpassword
And you’ll have a new wyze service you can call to register new sensors and read motion, etc.
The specific sensors are very small, I’d say roughly the size of a large cherry tomato or kumquat. Uses one 3v battery, has a motion blinking ‘pinhead’ LED that is not very noticeable.
I don’t have a way to measure exactly how much latency there is, but I can tell you the motion is detected basically immediately. There is never enough time to wonder if the lights will come on before they actually DO come on. Less than a second, I’m sure.
I don’t know how quickly these clear motion, because i don’t use that feature. My preference is to turn the lights out in my rooms 120 seconds after last motion is detected.
Anyway, in closing, I can recommend these as a super low cost way to add motion to your home. I don’t know if the Gen 2 devices will work, as Wyze has moved to a separate RF bridge that is a Wifi device now.
The usb bridge will poke right into your PI and it will just work.
And isn’t that nice?
Hope this helps someone…
Jim
Hi,
I’ve read through all of this thread and I’m a bit overwhelmed by choice.
Is there a standard “go to” motion sensor that people recommend? I’m looking for low latency on detection, about 6m of detection and either USB power or extremely long (12mths+) battery life.
The blind time is less of an issue for this use case as it’ll be used for “human detected, turn on lights for 10mins” type automation.
Any help appreciated!
ZWave sensor. Aeotec are great. I run a few different models but all of them allow either battery or USB power. I have them all connected via USB so that they act as network repeaters and make the network faster and stronger
I had the same use-case. Ended up getting DIGOO DG HOSA HOSA Wireless Infrared PIR Detector Sensor Motion Detection For 433MHz Home Security Alarm System Kits|sensor sensor|sensor for alarmsensor infrared - AliExpress
You will need 433mhz hub. I made one using rpi3 with 433mhz receiver and python script that interprets received signal and sends MQTT to HA. If you are not into diy, you can get sonoff 433 receiver and flash it with tasmota i think.
Pros are they are cheap and extremely fast (probably less than a second to detect) and have cooldown period of maybe 3 seconds. I don’t know about battery, I have them for about 6 months and are working.
It is perfect for halls and places where people generally always move. To make the light turn on instantly, I installed door sensors from the same company. To have multiple sensors in one room, you will need Entity Controller addon for home assistant. It maintains a state of group of sensors which is necessary to have more than one sensor in one room (no matter which sensor detects you, the timer for turning off the light should be re-set).
I know the struggle with getting the right hardware, I am glad to help.
Could you please describe “better” ? I am also planing to buy a conbee 2.
<s>I have allready a zigbee bridge (Lidl Silvercrest hacked) and a sonoff zigbee bridge (wifi to zigbee flashed with tasmota running zigbee2mqtt) both integrated in Hass.</s>
<s>Is it possible to had a third bridge (sonoff rf 433 bridge)?? </s>
<s>And how to do it.</s>
<s>Which protocol mqtt??</s>
<s>Thanks in advance.</s>
There is soo much out there and first of all, you should choose based on the existing integrations you have, if you have Zigbee/Zwace/433 then go with that…i.e. I donot recommend adding just-for-this. And also look at youtube, plenty of info and explaining why you want or not want a specific sensor, e.g. there are sensors that take up to 2 minutes to reset.
Example (there is more)
(67876) Best Motion Sensors for Home Assistant (WATCH before you BUY!) - YouTube