Nice project :+1: manufacturers datasheets, RF appnotes etc all mention this, with results for different usecases (like gnd plane size etc). I mentioned it a few times on the forum: nothing under or near antenna (keep out zone) their matching circuit, and CE/FCC certif are based on their development boards+their antenna if external, often without enclosure. there are a very few pcb antennas which are resilient to untuning. ceramic or meandered pcb are usually more compact but less resilient (like when you approach your hand and device suddently has better or worst communication) once you change any of these parameters (board shape, gnd size, enclosure etc), it breaks FCC, and may need retuning, still you can get useable range. "ideally" tuning should be done once enclosed for example. manufacturers can't cover all cases. on my side, I try to follow these rules. and when interested in a design or a device, I check this. Mainly the routing+gnd, antenna choice, keepout zone, and orientation vs my usecase (long range needed or not for example)

hello :) @berkseo can you share sketch for this sensor ? i am very intrested about this :) thank you PS: great job !

Can you tell something about the range of this node? And do you see a chance to post the schematic?

"So as soon as i've checked this is working as before, i release gerbers, and ask for a mini pcba if people interested." Just in case it was not clear in the other thread, I am ;) If the quote you get for PCBA is reasonable of course, else I'll shift to the power hungry versions with bigger batteries until I feel confident to solder 0603. Or to re-make the design with sized-up components :) The PIR sensor is pretty cheap, but I guess it's already too high for most breakout board sellers on aliexpress who want to keep the price ultra low. I'm just surprised companies like Adafruit or Sparkfun never did anything low power and just resell the 1$ SR501 at 10$ Only DFRobot claims to have a 15µA PIR which is already a great improvement but I can't get it shipped to Vietnam without shelling out 20$ for express mail :( Happy new year to you too !

@yoonie said: For the pro mini version, should i create another Openhardware project, or should i put it here, in the already existing project? Might be better to create a new project as they uses a different set of design files.