#include <TM1637Display.h>

#define RELAY A5
#define SW_START A4
#define SW_SEC A2
#define SW_MIN A1

#define CLK A3
#define DIO 3

TM1637Display seg7display(CLK, DIO);

uint8_t setMin = 0, setSec = 0; // uint8_t เก็บค่าได้ 0 to 255
uint16_t totalSeconds = 0, timeInt;
bool startFlag = 0;
#define SET_TIME_INT ((setMin*100)*setSec)

void calculateTotalSeconds(void){
  totalSeconds = (setMin*60)+setSec;
}

void secondsToTimeInt(void){
  uint8_t min_loc=0,sec_loc=0;
  min_loc = (int)totalSeconds/60;
  sec_loc = (int)totalSeconds%60;
  timeInt = ((min_loc*100)+sec_loc);
  seg7display.showNumberDecEx(timeInt, 0x40, true, 4, 0);
}

//================
ISR(TIMER1_COMPA_vect){
  if(startFlag>0){
    if(totalSeconds>0)totalSeconds--;
    else{startFlag=0; digitalWrite(RELAY, HIGH);
  }
}

//================

void setup(){
  pinMode(RELAY, OUTPUT);
  pinMode(SW_START, INPUT);
  pinMode(SW_SEC, INPUT);
  pinMode(SW_MIN, INPUT);
  delay(400);
  digitalWrite(RELAY, HIGH);
  seg7display.setBrightness (0x0f);
  seg7display.showNumberDecEx(SET_TIME_INT, 0x40, true, 4, 0);

//================
// Setup Timer Interrupt for 1 second
//================
  cli();  //turn off all interrupts
    TCCR1A = 0; //time counter control
    TCCR1B = 0;
    OCR1A = 0xF424; //output compare register
    TCCR1B = (1<<WGM12) | (1<<CS12);
    TIMSK1 = (1<<OCIE1A);
  sei();  //enable global interrupts
//================



}