Low power receiver options for the RFM12B – how a battery node can listen for commands without keeping the radio always on.
Power saving techniques for the Attiny84 powered TinySensor
Power saving techniques that let the ATtiny84 TinySensor run for months on a CR2032 – two months of room temperatures and counting.
TinySensor’s SD card power consumption worries (and solution)
The SD card was ruining TinySensor’s coin cell battery budget – measuring the sleep current problem and the fix.