@Andreas-Menzel I personally tend to replace the batteries early enough. I also have at the controller level a couple of safety checks with are ensuring 1) the "close" message is acknowledged by the sensor and if not resend it again 2) a humidity sensor in the ground checking if it is still irrigating after e.g. 2-3 hours the valve is supposed to be closed.
I've noticed if the battery is almost over and unable to close the valve once, it will likely succeed when retrying. Then of course batteries have to be changed.
Over the years I've refined this old project over and over mainly making the capacitor bigger since the valve would otherwise drain so much current to dramatically shorten the battery's life. But this is still border line for the capability of a battery powered sensor I believe.
@Jon-Raymond Well, not seeing a lot of activity in the repo.
I took a very long shot at adding support https://github.com/nikolac/arduino-nRF5/tree/nrf52805-s112-support.
I was able to flash the softdevice, but I haven't tested or even uploaded a working sketch (sloppy). Feel free to mess around and test. If it works for you, I do the same for S113.
Biggest question I have is around figuring out the proper values for the "linker scripts" https://github.com/nikolac/arduino-nRF5/blob/nrf52805-s112-support/cores/nRF5/SDK/components/softdevice/s112/toolchain/armgcc/armgcc_s112_nrf52805_xxaa.ld
@korttoma I set up a pir node with promini and nrf24l01+ about 6 weeks ago running on 2xAAA batterues. No false triggers yet and it detects many movements each day. Battery level is still 100% (3V) so it is possible to do this. Maybe something else is affecting your previous test, like situation, distance or interfereing signals?
But you have another solution that mighte well be useful to someone else with the issues you faced. Good of you to share it.