Power saving

Thread continued from Module 4: Tying It All Together

Hi Akiba and Jacinta,

wonderful course!!!

further to my previous email, we're testing batteries and for some reason I can't get more than 24-hrs with 3x AA rechargable batteries [max charge 4.09V, 2100mAh]. Just using DHT-11 and RTC interrupts at 10-min.

Am hoping that 2x 18650's (2200mAh each, in parallel) will last more than 7-days. 

Am i missing code for a powersaving/sleep mode??

[Also, I can't understand my RTC calibration error - the day ticks over fine but month went from march to january.]

I've attached the Arduino sketch.