I make my first project (thanks to all for help) Switch , with battery and temperature monitoring..
here is my node PCB :
and here is schematic :
and project :
This project use two button INT0 and INT1 . if change state then send packet with ACK request .
if no ACK received then generate sound .. from piezoelectric generator .
Battery is in volate *10 - if received value is for example 28 it s 2.8V .
now working good .. power consumption is 7uA .
PS> I need help with pin change interupt .. I now use two button only .. but want support 4x button.. then need litle help how to use it ..