int relay[5] = {53, 13, 12, A0, A1};

unsigned long time_group[5];
unsigned long num_rep_group[5] = { 1, 1, 1, 1, 1 };

void seq(int group, bool st_ini, unsigned long time_ini, unsigned long time_on, unsigned long time_off, unsigned long time_total)
  {
    unsigned time_actual = millis()-time_group[group]; 
    if ((time_on + time_off)>0)
      {
        unsigned temp_time = time_total - time_ini;
        int num_rep = temp_time / (time_on + time_off);
        if (time_actual<=time_ini)
          {
            digitalWrite(relay[group], st_ini);
            num_rep_group[group] = 1;
          }
        else if (time_actual<=(time_ini + (num_rep_group[group]*time_on + (num_rep_group[group]-1)*time_off))) 
          {
            digitalWrite(relay[group], !st_ini);
          }
        else if (time_actual<=(time_ini + num_rep_group[group]*(time_on + time_off))) 
          {
            digitalWrite(relay[group], st_ini);
          }
        else if(time_actual<time_total)
          {
            if (num_rep_group[group]< num_rep) num_rep_group[group]++;
          }
        else if(time_actual>=time_total) 
          {
            time_group[group] = millis();
          }
      }
     else
      {
        if (time_actual<=time_ini)
          {
            digitalWrite(relay[group], st_ini);
          }
        else if(time_actual<time_total)
          {
            digitalWrite(relay[group], !st_ini);
          }
        else if(time_actual>=time_total) 
          {
            time_group[group] = millis();
          }
      }
    
    
  }
  
void setup() {
  for(int i=0; i<5; i++)
    {
      pinMode(relay[i], OUTPUT);
      digitalWrite(relay[i], HIGH);
      time_group[i] = millis();
    } 
}

void loop() {
  seq(0,  LOW, 10000,    0,    0, 130000);
  seq(1, HIGH, 15000,  500,  500, 130000);
  seq(2, HIGH, 20000, 1000, 1000, 130000);
  seq(3, HIGH, 25000, 3000, 3000, 130000);
  seq(4, HIGH, 25000, 3000, 3000, 130000);
}