I have a cheap ESP01 relay module and am using it with ESPEasy. I soldered the GPIO pin 16 to RST to allow deep sleep and that all works great.
However when the unit wakes up the relay flickers quite a bit. The application I had in mind was for a 12v fridge which draws quite a bit of current on start up. I think this flickering would damage the fridge compressor or controller pretty quickly, not to mention wearing out the relay itself.
I need the unit to wake up from deep sleep, and keep the relay in the off position, unless triggered by some external criteria.
Perhaps a capacitor would absorb the pin high voltage for a short period until it's booted? Trouble is that I don't really want to hack the module, I'll probably break something.