0.5-5.5V power input to be able to run on many kind of batteries using TPS61201.
2.54mm pinout of GPIO spaced so it will be easy to put the devboard on a breadboard.
Pullup/down resistors attached for boot, deepsleep, chip enable.
Deepsleep output prewired to reset
ADC connected to a voltage divider from the battery.
Version 2: Comment on ideas below :) I want something really small but with a lot of functions and still lowpower, I thinking USB programming and an even smaller boards
- Even smaller board