Micropower data collection

Here’s Big Mess o’ Wires on  micropower data collection:

Hallelujah! After substituting an external 32768 Hz crystal as the timer clock source for my hiking data logger, I’ve reduced the sleep mode (LCD off) supply current to less than 0.01 mA! It’s actually below the resolution of my multimeter– the meter just reads zero. Previously I was using the microcontroller’s internal clock as the timer clock source, which required it to keep running during sleep mode, and resulted in a sleep supply current of 0.11 mA.