SenneS wrote:It hasn't have a usb serial so that's no problem.
What SparkFun Thing do you have, since the one I know has a USB-UART convertor on-board.
SenneS wrote:But still if you read about the esp8266 and deepsleep you find that people can power it for weeks when I only get to power it for under a week.
(Most of) these projects don't use a development board like the SparkFun Thing, NodeMCU or Wemos, but a single ESP module (like an ESP-01 or ESP-12) combined with it a low external component count (like drivers for I/O) and an optimized low-loss DC-DC convertor.