// === ESP32 + CD74HC4067 (entrées analogiques) + 74HC595 (sorties LEDs) ===

// CD74HC4067
#define S0 4
#define S1 5
#define S2 18
#define S3 19
#define EN 12
#define SIG 25  // COM relié à ADC

// 74HC595
#define DS   27  // Data
#define SHCP 26  // Clock
#define STCP 14  // Latch

void setup() {
  Serial.begin(115200);
  Serial.println("ESP32 : CD74HC4067 (entrées) + 74HC595 (sorties LEDs)");

  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
  pinMode(EN, OUTPUT);
  digitalWrite(EN, LOW);

  pinMode(DS, OUTPUT);
  pinMode(SHCP, OUTPUT);
  pinMode(STCP, OUTPUT);
}

void selectChannel(byte channel) {
  digitalWrite(S0, channel & 0x01);
  digitalWrite(S1, (channel >> 1) & 0x01);
  digitalWrite(S2, (channel >> 2) & 0x01);
  digitalWrite(S3, (channel >> 3) & 0x01);
  delayMicroseconds(5);
}

int readMux(byte channel) {
  selectChannel(channel);
  delayMicroseconds(5);
  return analogRead(SIG);
}

// Envoie un octet vers le 74HC595
void write595(byte data) {
  digitalWrite(STCP, LOW);
  shiftOut(DS, SHCP, MSBFIRST, data);
  digitalWrite(STCP, HIGH);
}

void loop() {
  byte leds = 0; // 8 bits = 8 LEDs
  Serial.println("Lecture des capteurs :");

  for (int i = 0; i < 8; i++) {
    int val = readMux(i);
    Serial.print("Canal ");
    Serial.print(i);
    Serial.print(" = ");
    Serial.println(val);

    // Seuil simple : si capteur > 2000 -> LED ON
    if (val > 2000) {
      leds |= (1 << i);
    }
  }

  // Mise à jour des LEDs via 74HC595
  write595(leds);

  delay(500);
}