void setup() {
  Serial.begin(9600); 
  pinMode(PA0, INPUT_ANALOG); 
}

void loop() {
  long ti = micros(); 
  int sensorValue = analogRead(PA0); 
  long tf = micros() - ti ; 
  
  float tensao = (float(sensorValue)/4096) * 3.3; 
  
  Serial.print(tf); 
  Serial.print("us --> ADC ="); 
  Serial.println(tensao);
  
  delay(1000); 
}