const byte pinPotentiometre = A0;
const int pinConsigne = 12;

const unsigned long dureeCycle = 4000;
unsigned long debut;

bool actif = false;

void allumer() {
  digitalWrite (pinConsigne, HIGH);
  debut = millis();
  actif = true;
}

void eteindre() {
  Serial.print("J'éteins. J'étais allumé pendant (ms) : ");
  Serial.println(millis() - debut);
  digitalWrite (pinConsigne, LOW);
  actif = false;
}

void setup () {
  Serial.begin(115200);
  pinMode(pinConsigne, OUTPUT);
}

void loop() {
  if (actif) {
    int reglagePotar = analogRead(pinPotentiometre);
    unsigned long tpsConduction = map(reglagePotar, 0, 1023, 0, 1000);
    if (millis() - debut >= tpsConduction) eteindre();
  } else {
    if (millis() - debut >= dureeCycle) allumer();
  }
}