I am trying to run an ESP8266-01S in short bursts from a supercapacitor/solar cell combination.
I have everything figured out (overvoltage protection, LDO regulator, etc) and it all works just like I want with one exception: when the sun comes up I have to manually reset the ESP device before it will run. Apparently, it goes into some kind of pseudo-alive state when awoken by insufficient voltage.
What I need is a simple discrete circuit that will hold the reset pin down until at least 3 V is available to properly power the processor. I figure that maybe a Zener/resistor/transistor combo or perhaps just a voltage divider on the reset pin may do it, but I'm sure this has been worked out before.
What's the easiest/best way to do this?