int led1=13;
int led2=12;
int led3=11;

int btn1=2;
int btn2=3;
int btn3=4;

bool btnsta1=0;
bool btnprevsta1=0;
bool ledsta1=0;

bool btnsta2=0;
bool btnprevsta2=0;
bool ledsta2=0;

bool btnsta3=0;
bool btnprevsta3=0;
bool ledsta3=0;

unsigned long settime=3000;

unsigned long starttime1=0;
unsigned long elapetime1=0;
void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(btn1, INPUT);

}

void loop() {
  btnsta1=digitalRead(btn1);
  if(btnsta1==1){
  checkled1();
  }
  else{
    digitalWrite(led1, LOW);
    btnprevsta1=0;
    starttime1=millis();
  }
  //Serial.println(starttime);
}

void checkled1(){
  if(btnprevsta1=0){
    starttime1=millis();
    digitalWrite(led1, HIGH);
  }
  else{
    elapetime1=millis()-starttime1;
    if(elapetime1>=settime){
      digitalWrite(led1, LOW);
      delay(200);
      digitalWrite(led1, HIGH);
      delay(200);
      digitalWrite(led1, LOW);
    }
    else{
      digitalWrite(led1, HIGH);
    }
  }
Serial.print("elapetime1=");
Serial.println(elapetime1);
}