I can't explain why one does work, but I can tell you why the other doesn't: the C compiler assumes that variables can only change after some specific events, e.g. a function call. In your while loop, if trigger is false, there is no function call in the 'path' the code takes, so the compiler assum...

Hello everyone, i have a question that might be trivial for some of you but i really can't understand what is going on. Do you understand why this work well: #include <Arduino.h> #define LED 12 #define R1 27 #define NO 14 bool RUNNING = true; bool TRIGGER = false; void IRAM_ATTR NO_trigger() { if(!T...