Contact debounce (millis) plus delayed off state

hi, use david mellis's code success debounce:

code: [select]


  // read ldra , debounce
  int readingldra = digitalread(ldra);
  if (readingldra != laststateldra) {
    lastdebouncetimeldra = millis();
  }
  if ((millis() - lastdebouncetimeldra) > debouncedelay) {
    if (readingldra != stateldra) {
      stateldra = readingldra;
    }
  }
laststateldra = readingldra;



but when want introduce within routine delayed output when debounced input goes high -> low hit brick wall. here 1 of attempts:

code: [select]


  // read ldra , debounce
  int readingldra = digitalread(ldra);
  if (readingldra != laststateldra) {
    lastdebouncetimeldra = millis();
  }
  if ((millis() - lastdebouncetimeldra) > debouncedelay) {
        if (readingldra != stateldra) {
          lastoffdelayldra = millis();}
     
        if (readingldra == low) {
          stateldra = readingldra;}
        else {
           if ((millis()-lastoffdelayldra) > (offdelay)) {
          stateldra = readingldra;}
        }
  }


the purpose debounce contact both l->h h->l (mellis's code) want introduce delay (offdelay) between input (readingldra) , output (stateldra) when input goes h-l.

what wrong in code? appears if stateldra never changes h l.

you need separate state change detection/debounce code "use state change purpose" code.

you detest state change occurred, , state change occurred reasonable amount of time after last state change. if case, set flag.

later, check flag, , use fact state changed, immediately, or later, depending on when state changed.

if explained why want bizarre, perhaps more provided.

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