Update : Day 3 and still all PIR nodes are working 
I´m using the given sketch here.
Best posts made by Komaandy
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RE: My Slim 2AA Battery Nodeposted in My Project
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RE: My Slim 2AA Battery Nodeposted in My Project
Still up and running stable.
8Mhz Bootloader did the trick for me
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RE: Slim Node as a Mini 2AA Battery PIR Motion Sensorposted in My Project
@siod
I removed both to make the smaller ( HC-SR505 ) work with ~3Volt and bridged these contacts as shown in the picture
They work perfectly fine for me and are not too sensitive.
Actually they dont even react on my cats, which is nice, because the "bigger" HC-SR501 always did...