So recently I finally have sometime to write down some previous log.

This is my previous version sensor node, power by Arduino Uno with HDC1000 + BMP085 and Nrf24L01

to minimize the power, CR2032 is connected directly to system power, so I have to clock Uno down to 8Mhz, also you can see that I've added a jumper to disconnect Led after finish develop software.

By using sleep mode and optimize reading, I can reach 27uA at idle, and average 44.6uA.