I just recently purchased the P1 sensor to automate my stair lights that I was hoping could be triggered by motion from both floors (placing the sensor on the wall of the landing) so I can use a single sensor for both floors. I knew that it would be a challenge to detect motion based on vertical angle due to the height difference between both floors, but I never even got to testing that part. I could never reliably get the P1 sensor to detect my motion unless I'm around 6 feet or less away from it. And even on high sensitivity, it won't detect my presence if I move slowly towards it, until I'm almost near it. I was so bewildered by how unreliable it is that I took my really old Wyze Sensor V1 and compared it with the P1. 80-90% of the time, the old Wyze Sensor would instantly pick me up as I move slowly into view, while the P1 will just sit there idly untill all of a sudden it triggers. I felt so frustrated with how bad the detection was that I returned the 4 P1 sensors I bought and had planned to replace various manual sensors in the house. I wonder if I should try and get my hands on the original Aqara Motion sensor and see how that works.
Thanks for sharing your experience! Yeah, I find the original Aqara ones infinitely better. I have been using them for maybe even 6 years at this point. I have a mixture of Aqara and the original Mi Home branded ones, which are basically the same but without the light sensor. As you mention yourself you might still struggle between 2 floors, however I actually do have a sensor at the top of the stairs which can trigger at the bottom and top of the stairs. Just make sure you put it in a place where people walk across the sensor rather than towards or away from it for the best results.
