Mr. Peter I fully agree with Mr. , you are completely right. This position of changing the processor is what I believe. It arrived from 4.00 to 4.15V the problem is that we didn't notice because the boards worked well. the regulator is on a processor...

Good morning Mr. Peter,thank you very much for the answer, your calculations are correct, at first I thought like you, the lm1117 input is powered by a flaybakde regulated 5V output source. with the dropout of the regulator it is 1V so it always appl...