unsigned long origine;
int previousValue;
 
void setup()
{
  Serial.begin(9600);
  previousValue = 0;
  origine = micros();
}
 
void loop()
{
  unsigned long time = micros()-origine;
  int val = analogRead(A0);
   
  if (val != previousValue){
    Serial.print((time-1)/1000.); // en ms
    Serial.print(" ");
    Serial.println(previousValue*5./1023.); // en V
    Serial.print(time/1000.); // en ms
    Serial.print(" ");
    Serial.println(val*5./1023.); // en V
    previousValue = val;
  }
 
}