//A  B  C  D  E  F  G  .
byte led7[] = {7, 6, 5, 4, 3, 2, 1, 0};    
int maled[] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90}; // so2  
int Led_Chuc = 12;
int Led_DV = 13;
int so;
int nut = 21;


void set_IT() 
{
  noInterrupts(); // disable interrupts while we setup 
  // reset Timer 1 configurations, default to interrupt on overflow
  TCCR1A = 0; 
  TCCR1B = 0;
  // set bits 0-2 to select the scalar value
  // 001 = 1
  // 010 = 8
  // 011 = 64
  // 100 = 256
  // 101 = 1024
  TCCR1B = (TCCR1B & B11111000) | B001;   // Pre-scalar = 1024
  // enable timer 1 overflow interrupt by setting bit 0 of TIMSK1
  TIMSK1 |= 1; 
  interrupts();  // enable all interrupts
}


ISR(TIMER1_OVF_vect) 
{
  Quet_Led();
}

void setup() 
{ 
  set_IT();
  pinMode(nut, INPUT_PULLUP);   // Khai bao nut nhan la ngo vao
  pinMode(Led_Chuc, OUTPUT);    pinMode(Led_DV, OUTPUT);
  digitalWrite(Led_Chuc, HIGH); digitalWrite(Led_DV, HIGH);

  for (int i = 0; i < 8; i++)
  {
    pinMode(led7[i], OUTPUT);
    digitalWrite(led7[i], HIGH);
  }
  so = 49;
}



void loop() 
{  
   Quet_Nut();
}


void Quet_Led()
{
  digitalWrite(Led_Chuc, HIGH); digitalWrite(Led_DV, LOW);
  Hien(so/10);   // chuc = so/10    chia lay phan nguyen
  delay(10); OFF_data();
  digitalWrite(Led_Chuc, LOW); digitalWrite(Led_DV, HIGH);
  Hien(so%10);   // chuc = so%10    chia lay phan du
  delay(10); OFF_data();
}

void Quet_Nut()
{
  if (digitalRead(nut)==0)
   {
     so++;
     if (so > 99) {so = 0;}
     while(digitalRead(nut)==0);
     delay(100);
   }
}

void Hien(int v)
{
  for (int i = 0; i < 8; i++)
  {
    digitalWrite(led7[i], maled[v] & 0x01<<i);
  }
}

void OFF_data()
{
  for (int i = 0; i < 8; i++)
  {
    digitalWrite(led7[i], 0xFF & 0x01<<i);
  }
}