int relay[3]={21,19,18};//pines de accionamiento de los reles
int led[3]={15,2,4};//pines para encender los leds
int botton[3]={16,17,5};//pines de los pulsadores
unsigned long Tim0;//variables para millis
unsigned long Tim2;
unsigned long Tim4;
unsigned long Tim6;
unsigned long Tim1=0;
unsigned long Tim3=0;
unsigned long Tim5=0;
unsigned long Tim7=0;
int wait0=500;
int wait1=500;
int wait2=500;
int wait3=500;
boolean ledReset=false;//parpadeo
int flag=0;//bandera para apagar parpadeo

void setup() {
  Serial.begin(9600);
  for(int i=0; i<=3; i++){
    pinMode(led[i],OUTPUT);
    pinMode(relay[i],OUTPUT);
    pinMode(botton[i],INPUT);
    digitalWrite(relay[i],LOW);
    digitalWrite(led[i],LOW);
  }
}

void loop() {
  Tim0=millis();
  if((Tim0-Tim1)>=wait0 && flag==0){
    Tim1=Tim0;
    ledReset=!ledReset;
    digitalWrite(led[1],ledReset);
  }
  Tim2=millis();
  int Reset=digitalRead(botton[2]);
  if((Tim2-Tim3)>=wait1 && Reset==1){
    flag=1;
    digitalWrite(led[1],LOW);
    Tim3=Tim2;
    for(int i=1; i<=2; i++){
      digitalWrite(relay[i],HIGH);
    }
  }
   Tim4=millis();
  int Start=digitalRead(botton[0]);
  if((Tim4-Tim5)>=wait2 && Start==1 && flag==1){
    Tim5=Tim4;
      digitalWrite(relay[0],HIGH);
    
  }
  Tim6=millis();
  int Stop=digitalRead(botton[1]);
  if((Tim6-Tim7)>=wait3 && Stop==1){
    flag=0;
    Tim7=Tim6;
    for(int j=0; j<=3; j++){
      digitalWrite(relay[j],LOW);
    }
  }
}