#define segA 2
#define segB 3
#define segC 4
#define segD 5
#define segE 6
#define segF 7
#define segG 8
#define DP 9

#define up_bt 13 
#define down_bt 12

int up_state , down_state , level; 

void setup() {

  Serial.begin(9600);

  pinMode(up_bt , INPUT);
  pinMode(down_bt , INPUT);
 for(int pin=2 ; pin <= 9 ; pin++)
 {
  pinMode(pin , OUTPUT);
 }
}
void loop() 
{
up_state = digitalRead(up_bt) ; 
down_state = digitalRead(down_bt) ; 

if(up_state == HIGH  &&  level < 9){
  level = level + 1 ; 
  delay(2000) ; 
}
if(down_state == HIGH  &&  level > 0){
  level = level - 1 ; 
  delay(2000) ; 
}

switch (level){
  case 0 : zero() ; break ; 
  case 1 : one() ; break ; 
  case 2 : two() ; break ; 
  case 3 : three() ; break ; 
}



Serial.println("Up bt :"+String(up_state)+" Down Bt :"+String(down_state)+" Level :"+String(level));
delay(50) ; 
  
}


void zero(){
  clean() ;
   for(int pin=2 ; pin <= 9 ; pin++)
 {
  if(pin != 8){
  digitalWrite(pin , HIGH) ;}
 }
}
void one(){
  clean() ;
  digitalWrite(segB , HIGH) ; 
  digitalWrite(segC , HIGH) ; 
}

void two(){
  clean() ;
  for(int pin=2 ; pin <= 9 ; pin++)
 {
  if(pin != 7 && pin != 4){
  digitalWrite(pin , HIGH) ;}
 }
}
void three(){
  clean() ;
   for(int pin=2 ; pin <= 9 ; pin++)
 {
  if(pin != 6 && pin != 7){
  digitalWrite(pin , HIGH) ;}
 }
}

void clean(){
   for(int pin=2 ; pin <= 9 ; pin++)
 {
  digitalWrite(pin , LOW) ;
  }

}















void test_display(){
   for(int pin=2 ; pin <= 9 ; pin++)
 {
  digitalWrite(pin , HIGH) ; 
 }
}