using namespace std;
#define A1 0
#define A2 4
#define A3 16
#define A4 17
#define A5 5
#define A6 18
#define A7 19
#define A8 21
#define A9 22
#define A10 23
void setup(){
  pinMode(A1,OUTPUT);
  pinMode(A2,OUTPUT);
  pinMode(A3,OUTPUT);
  pinMode(A4,OUTPUT);
  pinMode(A5,OUTPUT);
  pinMode(A6,OUTPUT);
  pinMode(A7,OUTPUT);
  pinMode(A8,OUTPUT);
  pinMode(A9,OUTPUT);
  pinMode(A10,OUTPUT);
  Serial.begin(115200);
  Serial.println("LED Bar Graph Control Ready. Send 0-9 or A.");
}
void TurnOff(){
  digitalWrite(A1,0);
  digitalWrite(A2,0);
  digitalWrite(A3,0);
  digitalWrite(A4,0);
  digitalWrite(A5,0);
  digitalWrite(A6,0);
  digitalWrite(A7,0);
  digitalWrite(A8,0);
  digitalWrite(A9,0);
  digitalWrite(A10,0);
}
void TurnOn(int c){
  TurnOff();
  for (uint8_t i=0;i<c;i++){
    switch (i){
      case 0:
      digitalWrite(A1,1);
      break;
      case 1:
      digitalWrite(A2,1);
      break;
      case 2:
      digitalWrite(A3,1);
      break;
      case 3:
      digitalWrite(A4,1);
      break;
      case 4:
      digitalWrite(A5,1);
      break;
      case 5:
      digitalWrite(A6,1);
      break;
      case 6:
      digitalWrite(A7,1);
      break;
      case 7:
      digitalWrite(A8,1);
      break;
      case 8:
      digitalWrite(A9,1);
      break;
    }
  }
  if (c==10){
      digitalWrite(A10,1);
    }
}
void loop(){
  if (Serial.available()){
      char c=Serial.read();
      if (c=='0'){
        TurnOff();
      }
      else if (c=='a' || c=='A' || c=='1' || c=='2' || c=='3' || c=='4' || c=='5' || c=='6' || c=='7' || c=='8' || c=='9'){
        int value;
        switch(c){
          case '1':
          value=1;
          break;
          case '2':
          value=2;
          break;
          case '3':
          value=3;
          break;
          case '4':
          value=4;
          break;
          case '5':
          value=5;
          break;
          case '6':
          value=6;
          break;
          case '7':
          value=7;
          break;
          case '8':
          value=8;
          break;
          case '9':
          value=9;
          break;
          case 'a':
          value=10;
          break;
          case 'A':
          value=10;
          break;
        }
        TurnOn(value);
        Serial.print("LEDs set to: ");
        Serial.println(value);
      }
      else{
        Serial.println("Invalid command.");
      }
  }
}