#define pino 8
int dado = 0;
char caractere;

void setup() {
  Serial.begin(9600);  
  // put your setup code here, to run once:

}

void loop() {
  if(Serial.available() > 0){
    caractere = Serial.read();
    if(caractere == "g"){
      dado = analogRead(pino);
      Serial.println(dado);
    }

  }
  
}