Hi Ian.
I haven’t tried it, but it seems to work.
See here: https://github.com/espressif/arduino-esp32/issues/475#issuecomment-337655468
I hope this helps.
Regards,
Sara

Hello Sara,

Thanks for the link, it “compiles as is” and runs in the serial monitor.
Can’t see any reduction in power usage, I’ll try to include it in a sketch to see what happens.

Regards
Ian

Ok, then let me know the results.
Regards,
Sara