void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(17, OUTPUT); //A
  pinMode(5, OUTPUT);  //B
  pinMode(18, OUTPUT); //C
  pinMode(19, OUTPUT); //D
  pinMode(21, OUTPUT); //E
  pinMode(22, OUTPUT); //G
  pinMode(23, OUTPUT); //F
  
  //switch
  pinMode(16, INPUT_PULLUP);
  
}

long currentTime = 0; 
long lastTime = 0; 
long toogle7Segment = true;
int num=0;

void loop() {
  currentTime = millis();

  if(currentTime-lastTime>=500){
    lastTime = currentTime;
    if(digitalRead(16) == HIGH){
      num=0;
      showSevenSegment(num,toogle7Segment);
    }
    else{
      if(num<=15){
        showSevenSegment(num,true);
        num++;
      }
      else{
        num=1;
        showSevenSegment(num,true);
        num++;
      }
    }
    toogle7Segment = !toogle7Segment;
  }
}

void showSevenSegment(int num,bool status){
  if(status == true){
    if(num==0){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, LOW); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==1){
      digitalWrite(17, LOW); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, LOW); //G
      digitalWrite(23, LOW); //F
    }
    if(num==2){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, LOW); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, LOW); //F
    }
    if(num==3){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, LOW); //F
    }
    if(num==4){
      digitalWrite(17, LOW); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==5){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23,HIGH); //F
    }
    if(num==6){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==7){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, LOW); //G
      digitalWrite(23, LOW); //F
    }
    if(num==8){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==9){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==10){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==11){
      digitalWrite(17, LOW); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==12){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, LOW); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, LOW); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==13){
      digitalWrite(17, LOW); //A
      digitalWrite(5, HIGH);  //B
      digitalWrite(18, HIGH); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, LOW); //F
    }
    if(num==14){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, LOW); //C
      digitalWrite(19, HIGH); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
    if(num==15){
      digitalWrite(17, HIGH); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, LOW); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, HIGH); //E
      digitalWrite(22, HIGH); //G
      digitalWrite(23, HIGH); //F
    }
  }
    
  else{
      digitalWrite(17, LOW); //A
      digitalWrite(5, LOW);  //B
      digitalWrite(18, LOW); //C
      digitalWrite(19, LOW); //D
      digitalWrite(21, LOW); //E
      digitalWrite(22, LOW); //G
      digitalWrite(23, LOW); //F
  }
}