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

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

double ledblink=160;

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=5000;

unsigned long starttime1=0;
unsigned long elapetime1=0;
unsigned long starttime2=0;
unsigned long elapetime2=0;
unsigned long starttime3=0;
unsigned long elapetime3=0;
void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

  pinMode(btn1, INPUT);
  pinMode(btn2, INPUT);
  pinMode(btn3, INPUT);
}

void loop() {
  btnsta1=digitalRead(btn1);
  btnsta2=digitalRead(btn2);
  btnsta3=digitalRead(btn3);

  if(btnsta1==1){
  checkled1();
  }
  else{
    digitalWrite(led1, LOW);
    Serial.println("Tray_1 Cooling stop");
    btnprevsta1=0;
    starttime1=millis();
  }

  if(btnsta2==1){
  checkled2();
  }
  else{
    digitalWrite(led2, LOW);
    Serial.println("Tray_2 Cooling stop");
    btnprevsta2=0;
    starttime2=millis();
  }

  if(btnsta3==1){
  checkled3();
  }
  else{
    digitalWrite(led3, LOW);
    Serial.println("Tray_3 Cooling stop");
    btnprevsta3=0;
    starttime3=millis();
  }

}

void checkled1(){
  if(btnprevsta1=0){
    starttime1=millis();
    digitalWrite(led1, HIGH);
  }
  else{
    elapetime1=millis()-starttime1;
    if(elapetime1>=settime){
      digitalWrite(led1, LOW);
      delay(ledblink);
      digitalWrite(led1, HIGH);
      delay(ledblink);
      digitalWrite(led1, LOW);
    Serial.println("Tray_1 Overtime");
    }
    else{
      Serial.println("Tray_1 Cooling start");
      digitalWrite(led1, HIGH);
    }
  }
//Serial.print("elapetime1=");
//Serial.println(elapetime1);
}

void checkled2(){
  if(btnprevsta2=0){
    starttime2=millis();
    digitalWrite(led2, HIGH);
  }
  else{
    elapetime2=millis()-starttime2;
    if(elapetime2>=settime){
      digitalWrite(led2, LOW);
      delay(150);
      digitalWrite(led2, HIGH);
      delay(150);
      digitalWrite(led2, LOW);
      Serial.println("Tray_2 Overtime");
    }
    else{
      Serial.println("Tray_2 Cooling start");
      digitalWrite(led2, HIGH);
    }
  }

}

void checkled3(){
  if(btnprevsta3=0){
    starttime3=millis();
    digitalWrite(led3, HIGH);
  }
  else{
    elapetime3=millis()-starttime3;
    if(elapetime3>=settime){
      digitalWrite(led3, LOW);
      delay(150);
      digitalWrite(led3, HIGH);
      delay(150);
      digitalWrite(led3, LOW);
      Serial.println("Tray_3 Overtime");
    }
    else{
      Serial.println("Tray_3 Cooling start");
      digitalWrite(led3, HIGH);
    }
  }

}