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

int buzzer=10;

int buzzerState = LOW;
int alarmState = LOW;

int ledState1 = LOW;  
int ledState2 = LOW; 
int ledState3 = LOW; 

long previousMillis1 = 0;        // will store last time LED was updated
long previousMillis2 = 0;
long previousMillis3 = 0;

long previousMillisAlm = 0;


long interval = 300;

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

double ledblink=160; //ตั้งเวลา led กระพริบ

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=10000; //ตั้งเวลา coolling 

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();
  }

  if(alarmState==1){
    alarm();
  }
}

void checkled1(){
  if(btnprevsta1=0){
    starttime1=millis();
    //digitalWrite(led1, HIGH);
  }
  else{
    elapetime1=millis()-starttime1;
    if(elapetime1>=settime){
      ledblink1();
      
      
    //Serial.println("Tray_1 Overtime");
    }
    else{
      //Serial.println("Tray_1 Cooling start");
      digitalWrite(led1, HIGH);
    }
  }

}

void checkled2(){
  if(btnprevsta2=0){
    starttime2=millis();
    
  }
  else{
    elapetime2=millis()-starttime2;
    if(elapetime2>=settime){
      ledblink2();
      //Serial.println("Tray_2 Overtime");
    }
    else{
      //Serial.println("Tray_2 Cooling start");
      digitalWrite(led2, HIGH);
    }
  }

}

void checkled3(){
  if(btnprevsta3=0){
    starttime3=millis();
   
  }
  else{
    elapetime3=millis()-starttime3;
    if(elapetime3>=settime){
      ledblink3();
      //Serial.println("Tray_3 Overtime");
    }
    else{
      //Serial.println("Tray_3 Cooling start");
      digitalWrite(led3, HIGH);
    }
  }

}


void ledblink1(){
  unsigned long currentMillis = millis();
	
	if(currentMillis - previousMillis1 > interval) {
    	// save the last time you blinked the LED 
    	previousMillis1 = currentMillis;   

    	// if the LED is off turn it on and vice-versa:
    	if (ledState1 == LOW)
    	  ledState1 = HIGH;
    	else
    	  ledState1 = LOW;

    	// set the LED with the ledState of the variable:
    digitalWrite(led1, ledState1);
  }
	
}

void ledblink2(){
  unsigned long currentMillis = millis();
	
	if(currentMillis - previousMillis2 > interval) {
    	// save the last time you blinked the LED 
    	previousMillis2 = currentMillis;   

    	// if the LED is off turn it on and vice-versa:
    	if (ledState2 == LOW)
    	  ledState2 = HIGH;
    	else
    	  ledState2 = LOW;

    	// set the LED with the ledState of the variable:
    digitalWrite(led2, ledState2);
  }
	
}

void ledblink3(){
  unsigned long currentMillis = millis();
	
	if(currentMillis - previousMillis3 > interval) {
    	// save the last time you blinked the LED 
    	previousMillis3 = currentMillis;   

    	// if the LED is off turn it on and vice-versa:
    	if (ledState3 == LOW)
    	  ledState3 = HIGH;
    	else
    	  ledState3 = LOW;

    	// set the LED with the ledState of the variable:
    digitalWrite(led3, ledState3);
  }
	
}