#include <TimerOne.h>
#define ledPin 13
#define ledPin 12
int count = 0;
int state1 = 1;
int state2 = 1;
int Pushbutton1 = 3;
int Pushbutton2 = 2;

void setup () {
    pinMode(Pushbutton1, INPUT);
    pinMode(Pushbutton2, INPUT);
    pinMode(4, OUTPUT);
    pinMode(5, OUTPUT);
    pinMode(6, OUTPUT);
    pinMode(7, OUTPUT);
    pinMode(8, OUTPUT);
    pinMode(9, OUTPUT);
    pinMode(10,OUTPUT);
    SEGMENT_OUT(count);

    // initialize timer1
    noInterrupts(); // disable all interrupts
    TCCR1A = 0;
    TCCR1B = 0;
    TCNT1 = 34286; // preload timer 65536-16MHz/256/2Hz
    TCCR1B |= (1 << CS12); // 256 prescaler
    TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt
    interrupts(); // enable all interrupts
}
    ISR(TIMER1_OVF_vect) // interrupt service routine that wraps a user defined function
    //supplied by attachInterrupt
    {
    TCNT1 = 34286; // preload timer
    digitalWrite(ledPin, digitalRead(ledPin) ^ 1);

    if (count==10)
    count=0; //set PORTD output origin as number ‘0’
    count=count +1; //count will +1 every time the switch pressed
    //already programmed

    SEGMENT_OUT(count); //call the ‘segment_out(count) function which
    }



void loop()
{
state1 = digitalRead(Pushbutton1);
state2 = digitalRead(Pushbutton2);
  if (state1 == 1) {
    if (count==10)
    count=0;
    count=count + 1;
    SEGMENT_OUT(count);
  }
  else if (state2 == 1) {
    if (count==10)
    count=0;
    count=count -1;
    SEGMENT_OUT(count);
  }
}

void SEGMENT_OUT(int count) {
  switch(count)
  {
  case 9:{
  // write '9'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 1);
  digitalWrite(8, 1);
  digitalWrite(9, 0);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 8:{
  // write '8'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 0);
  digitalWrite(8, 0);
  digitalWrite(9, 0);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 7:{
  // write '7'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 1);
  digitalWrite(8, 1);
  digitalWrite(9, 1);
  digitalWrite(10, 1);
  delay(100);
  break;}

  case 6:{
  // write '6'
  digitalWrite(4, 0);
  digitalWrite(5, 1);
  digitalWrite(6, 0);
  digitalWrite(7, 0);
  digitalWrite(8, 0);
  digitalWrite(9, 0);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 5:{
  // write '5'
  digitalWrite(4, 0);
  digitalWrite(5, 1);
  digitalWrite(6, 0);
  digitalWrite(7, 0);
  digitalWrite(8, 1);
  digitalWrite(9, 0);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 4: {
  // write '4'
  digitalWrite(4, 1);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 1);
  digitalWrite(8, 1);
  digitalWrite(9, 0);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 3: {
  // write '3'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 0);
  digitalWrite(8, 1);
  digitalWrite(9, 1);
  digitalWrite(10,0);
  delay(100);
  break;}

  case 2: {
  // write '2'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 1);
  digitalWrite(7, 0);
  digitalWrite(8, 0);
  digitalWrite(9, 1);
  digitalWrite(10, 0);
  delay(100);
  break;}

  case 1: {
  // write '1'
  digitalWrite(4, 1);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 1);
  digitalWrite(8, 1);
  digitalWrite(9, 1);
  digitalWrite(10, 1);
  delay(100);
  break;}

  case 0: {
  // write '0'
  digitalWrite(4, 0);
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(7, 0);
  digitalWrite(8, 0);
  digitalWrite(9, 0);
  digitalWrite(10,1);
  delay(100);
  break;}
  }
  }