Custom Hardware Power Management

I have managed to get the ESP8266 board into MODEM_SLEEP mode if I use Espressif’s RTOS SDK instead of esp-open-rtos.  This is a shame because I liked the esp-open-rtos sdk build system, but I don’t have time to try to modify the SDK.

Using the Espressif SDK allows us to get the current consumption down to 25mA, which should give about 6 hours with the 150 mAh batteries I have in mind for the project – a bit too short still, so may need to use 2 bateries, or think of something else to make the board sleep more – but it is looking feasible which is promising.

See update here:

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