I am planning to use the following strategies to reduce power consumption of the next revision of the OpenDendrometer:

1. Remove the power status LED limit resistors from the Arduino Pro Mini and the RTC 3231 module.
2. Use a MCP1700-1502E/TO 1.5V voltage regulator for the digital tire depth gauge power rather than a voltage divider off the regulated 3.3V.
3. Remove the 3.3V voltage regulator from the Arduino Pro Mini. Use a MCP1700-3302E/TO 3.3V voltage regulator instead. 
4. Use a 2N7000 mosfet to cut power to the SD card when not in use.
5. Use a 2N7000 mosfet to cut power to the Bluetooth module during specific hours of the day. 
6. Log data to the SD card in batches. Fill RTC 3231 4k EEPROM, then dump to SD card.
7. Put the HM-10 Bluetooth module into a sleep state (via AT+SLEEP command) after disconnect.