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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Dorantor
@Gordon, deep sleep if for the future, when I have stable/predictable behaviour with screen.
My voltmeter shows constant 3.3V(+/- 0.02V). Between output of my "power module" and Espruino there is an electrolytic 1500uF capacitor. It's there for two reasons. First - remove possible pulsations from buck converter(step up module). Second - provide backup power storage for Espruino+screen startup. 1.5mF is a lot, but I currently doesn't have smaller :)
Approx 1 of 5 times when I connect Espruino to "power module", screen is working. And when I can see it's working it can last for about 1hr with fully charged supercap. I hope that with deep sleep it can be improved.
There is an
A4.write(1); // turn screen light on
to make sure code is running properly. Actually, I don't see any other points that I could check with LEDs.
I shall receive my mooshimeter soon, it should help to check if board is "browned out".
While board connected to USB everything is working properly.
Anyway, thanks for the help. I'll try to do some more investigations on my own and post my findings later.