@Mattias following on from my purchase of the RTCGQ13LM I have now also found and ordered the FP1 on AliExpress.
Try this link Aqara FP1 , 19 left at present so go grab one (or two).
Now which arrives first, CORE or the Aqara’s
Yeah I did see that as well and while it’s cool I also saw complaints/issues on the HA forum he linked back too. I think a lot of that came down to the 24Ghz chip he used as opposed to the more superior 60Ghz chip used in the FP1.
Thanks for that mate I have ordered 1 as well. I will start with 1 and see where it best fits in my house then try and get more if all goes well. Also worth noting is that same store sells the hard to get T1 Zigbee 3.0 motion sensors too see here.
Nice, as far as I understand it the T1 is an exact copy of the older model but is zigbee 3.0 which is good if you want to reuse the base from the older sensor that might be stuck to a wall . The P1 is zigbee 3.0 but it has a dual battery configuration so can last about 5 years but it won’t fit the same base…
Thanks @CliveS ! I’ve ordered one now. Every time I order from Chinese sites I wonder how they can offer freight at only a couple of dollars, if that… Even ordering something locally here from the next city over is at least 7 dollars
That is what I gleaned from the video as well. One question I had though, are any of these solutions battery powered or are the sensors just too much of a battery hog to do that right now? This type of sensor seems to be the future especially with the ability to bounce around corners, but if it can only be hardwired then deployment is going to be hampered.
I honestly doubt we will see a battery powered version, UNLESS maybe they incorporate a PIR sensor for initial detection with the micro used to monitor for fine movements, use OTA power, or incorporate some form of in built recharge system.
The reason a PIR sensor can last so long is when not actively being they are basically asleep not using anything but a sliver (we are talking sub 10ma) of power.
Generalizing quite a bit for time and space reasons…
A PIR sensor use a pair of pyroelectric sensors to detect heat energy in the surrounding environment. These two sensors sit beside each other, and when the signal differential between the two sensors changes (if a person enters the room, for example), the sensor will engage. This sends a high signal to the control board which wakes it from a sleep cycle and sends off the notice it is active. Once that differential is gone (no movement) the board enters a countdown state at the end of which if no motion has been detected an inactive signal is sent and the board goes back into sleep cycling.
The micro detection however has to constantly send and monitor the feedback of the microwave signal. On top of that you have to run some algorithms against the incoming data to determine distance, direction of motion, resolution, eliminate false positives etc… Very CPU intensive.
When active a PIR sensor consumes about .8W of power, a micro sensor consumes between 1 and 1.5W on average. Where a PIR sensor can be put to sleep to conserve energy a micro sensor cannot.
So while yes you could run the micro sensor off of a battery, the battery isnt going to last very long unless you have an active power source, or another sensor being used to trigger the micro sensor allowing the device to enter a deep sleep cycle when the room isnt occupied.
Side note, if you monitor those P1 sensors on the left/right or distance detection features you can usually still get near instant automations, you will just be more likely to get false positives