"External" memory for program memory?

Projects General Guidance
24

Yikes, I don't have time to trawl through all that, but here is an example

      stash.println((millis()/1000)/60);
      stash.print("Z,"); // Potência aparente
      stash.println((millis()/1000)/60);
      stash.print("ZA,"); // Fator de potência
      stash.println((millis()/1000)/60);
      stash.print("ZB,"); // Tensão RMS
      stash.println((millis()/1000)/60);
      stash.print("ZC,"); // Corrente RMS
      stash.println((millis()/1000)/60);
      stash.print("ZD,"); // Frequência
      stash.println((millis()/1000)/60);
      stash.print("ZE,"); // KWh
      stash.println((millis()/1000)/60);

Why call millis() and do that maths every time, do it once then print a variable.

setup() has a gazillion pinModes() in a row, use an array of pin numbers and a loop.

checktpa() has a humungous amount of duplicate code, maybe that could be reduced. For example

  if ((segunda==t.dow) && (hora==t.hour) && (minuto==t.min) && (tpa == 0))
  {
    tpa=1;
    if ((4294967295ul - tempo) < millis())
    {
      marcadoriniciotpa= millis() - (tempo*2);
    }
    else
    {
      marcadoriniciotpa= millis();
    }
  }

  if ((terca==t.dow) && (hora==t.hour) && (minuto==t.min) && (tpa == 0))
  {
    tpa=1;
    if ((4294967295ul - tempo) < millis())
    {
      marcadoriniciotpa= millis() - (tempo*2);
    }
    else
    {
      marcadoriniciotpa= millis();
    }
  }
// and another 7 times I think

The only difference between these is the variables being compared I think, at least put the body of the if() block in a function, but why do you do the same thing with different tests?

I'm sure this code could be substantially reduced, but unless you have finished it it will just grow too big again so a more capable platform may still be the answer.

Rob