const int segA = 32, segB = 33, segC = 25;
const int segD = 26, segE = 27, segF = 14, segG = 12;
char dado = '0';
int numBytes = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Digite um numero entre 0 e 9: ");
  displaySetup();
}

void loop() {
  numBytes = Serial.available();
  if(numBytes>0){
    // Serial.print("Qtd de Bytes no Buffer: ");
    // Serial.println(numBytes);
    char temp = Serial.read();
    if (temp != '\n'){
      dado = temp;
    }
    Serial.print("Dado lido: ");
    Serial.println(dado);
    delay(500);
  }
  if (dado == '0'){
    displayOn(1,1,1,1,1,1,0);//acende 0
  }
  else if (dado == '1'){
    displayOn(0,1,1,0,0,0,0);//acende 1
  }
  else if (dado = '\n'){
    displayOn(0,0,0,1,1,1,0);//acende L
  }
  else{
    displayOn(1,0,0,1,1,1,1);//erro
  }
}
void displaySetup(){
  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC, OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF, OUTPUT);
  pinMode(segG, OUTPUT);
}

void displayOn(bool stateA, bool stateB, bool stateC, bool stateD, bool stateE, bool stateF, bool stateG){
  digitalWrite(segA, stateA);
  digitalWrite(segB, stateB);
  digitalWrite(segC, stateC);
  digitalWrite(segD, stateD);
  digitalWrite(segE, stateE);
  digitalWrite(segF, stateF);
  digitalWrite(segG, stateG);
}