Chat here about code rewrites, mods, etc... with respect to the github project https://github.com/esp8266/Arduino

Moderator: igrr

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By AcmeUK
#28636
ADC_MODE(ADC_VCC); in combination with ESP.getVcc()

This is now the correct way to do it. There are now problems using readvdd33!

For more information read the warning in the revised first post in this thread.