#define MU 21
#define RU 19
#define RD 18
#define MD 5
#define LD 4
#define LU 2
#define MM 15

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Display activated. Counter started.");
  pinMode(21, OUTPUT);digitalWrite(21, LOW);
  pinMode(19, OUTPUT);digitalWrite(19, LOW);
  pinMode(18, OUTPUT);digitalWrite(18, LOW);
  pinMode(5 , OUTPUT);digitalWrite(5 , LOW);
  pinMode(4 , OUTPUT);digitalWrite(4 , LOW);
  pinMode(2 , OUTPUT);digitalWrite(2 , LOW);
  pinMode(15, OUTPUT);digitalWrite(15, LOW);
}
int digit = 0;
void loop() {
  digitalWrite(MU, 1);//0
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD , 1);
  digitalWrite(LD , 1);
  digitalWrite(LU , 1);
  digitalWrite(MM, 0);
  delay(1000);
  digitalWrite(MU, 0);//1
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD , 0);
  digitalWrite(LD , 0);
  digitalWrite(LU , 0);
  digitalWrite(MM, 0);
  delay(1000);
  digitalWrite(MU, 1);//2
  digitalWrite(RU, 1);
  digitalWrite(RD, 0);
  digitalWrite(MD , 1);
  digitalWrite(LD , 1);
  digitalWrite(LU , 0);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 1);//3
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD , 1);
  digitalWrite(LD , 0);
  digitalWrite(LU , 0);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 0);//4
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD , 0);
  digitalWrite(LD , 0);
  digitalWrite(LU , 1);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 1);//5
  digitalWrite(RU, 0);
  digitalWrite(RD, 1);
  digitalWrite(MD , 1);
  digitalWrite(LD , 0);
  digitalWrite(LU , 1);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 1);//6
  digitalWrite(RU, 0);
  digitalWrite(RD, 1);
  digitalWrite(MD, 1);
  digitalWrite(LD, 1);
  digitalWrite(LU, 1);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 1);//7
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD, 0);
  digitalWrite(LD, 0);
  digitalWrite(LU, 0);
  digitalWrite(MM, 0);
  delay(1000);
  digitalWrite(MU, 1);//8
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD, 1);
  digitalWrite(LD, 1);
  digitalWrite(LU, 1);
  digitalWrite(MM, 1);
  delay(1000);
  digitalWrite(MU, 1);//9
  digitalWrite(RU, 1);
  digitalWrite(RD, 1);
  digitalWrite(MD, 1);
  digitalWrite(LD, 0);
  digitalWrite(LU, 1);
  digitalWrite(MM, 1);
  delay(1000);
}