Version 0.2 of the OpenDendrometer board has been finalized. Boards are out for order with JLCPCB. 

v0.2 changes include:

• MCP1700-3302E/TO 3.3V regulator with low quiescent current instead of 3.3V regulator provided on Arduino Pro Mini
• MCP1700-1502E/TO 1.5V regulator instead of voltage divider off of regulated 3.3V
• pinout to accommodate the HM-10 Bluetooth module
• 2N7000 MOSFETs on SD card and HM-10 Bluetooth module power in order to disconnect when not in use to reduce power consumption
• SD card module flipped over so it is easier to insert the SD card
• 2N7000 MOSFET on Bluetooth "state" pin for microcontroller wake up interrupt
• battery JST connector moved closer to the edge for less interference with tire depth gauge wires

Most of these changes are part of the strategy to more than quadruple the battery life of the device. Interestingly, they will only add about $1.50 to the board cost. Current estimate of time between battery charging with the new strategies is 4 to 6 months.