ESP32 power saving options, modem sleep/slowing cpu.

[ThinkTransit]

This was raised on discord a while ago by somebody else, bringing it here for more exposure.

How do you implement modem sleep on the esp32 chips and is it possible to also slow down the cpu without breaking micropython to achieve the following ~2-4ma power consumption?

If nothing has been done in this space I might try and give it a go.

Any thoughts?

[davefes]

https://micropython-tve.readthedocs.io/en/esp32-low-power/library/esp32-lowpower.html

says you can drop the CPU frequency to 20MHz. Maybe listen_interval is interesting.

[ThinkTransit]

Thanks that's very interesting, looks like you can potentially go down to 10MHz by using the min freq option.

[karfas]

There is a patch request - #8993 - to enable the WIFI power save option on ESP32.