#include <Arduino.h>
#include <DHT.h>

// === Pin Configuration ===
#define DHTPIN     PB0
#define DHTTYPE    DHT22

#define MQ4_PIN    PA0   // Sensor Gas
#define LDR_PIN    PA1   // Sensor LDR
#define ACS_PIN    PA2   // Sensor Arus
#define LDR_LED    PB10  // LED indikator cahaya rendah
#define PIR_PIN    PB11  // Sensor PIR (digital)

// === DHT Object ===
DHT dht(DHTPIN, DHTTYPE);

// === Sensor Arus Constants ===
const float VREF = 3.3;          // Tegangan referensi ADC STM32
const float OFFSET = VREF / 2.0; // Tegangan tengah sensor (biasanya 1.65V)
const float SENSITIVITY = 0.185; // V/A (untuk ACS712-5A)

void setup() {
  Serial.begin(9600);
  dht.begin();
  analogReadResolution(12);  // gunakan ADC 12-bit (0–4095)

  pinMode(MQ4_PIN, INPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(ACS_PIN, INPUT);
  pinMode(LDR_LED, OUTPUT);     // LED indikator
  pinMode(PIR_PIN, INPUT);      // Jika perlu, bisa ganti ke INPUT_PULLDOWN

  Serial.println("Sistem Monitoring Sensor Siap...");
}

void loop() {
  // === Baca Sensor ===
  float suhu     = dht.readTemperature();
  int   gasValue = analogRead(MQ4_PIN);
  int   ldrValue = analogRead(LDR_PIN);
  int   acsValue = analogRead(ACS_PIN);
  int   pirState = digitalRead(PIR_PIN);  // 1 = gerakan terdeteksi, 0 = tidak

  // === Konversi ===
  float gasPct   = map(gasValue, 0, 4095, 0, 100);
  float cahaya   = map(ldrValue, 0, 4095, 100, 0);
  float voltage  = acsValue * VREF / 4095.0;
  float current  = (voltage - OFFSET) / SENSITIVITY;

  // === LED Indikator untuk cahaya rendah ===
  if (cahaya < 30) {
    digitalWrite(LDR_LED, HIGH);
  } else {
    digitalWrite(LDR_LED, LOW);
  }

  // === Tampilkan ke Serial ===
  Serial.println("===============");
  Serial.print("Suhu       : "); Serial.print(suhu);    Serial.println(" °C");
  Serial.print("Gas        : "); Serial.print(gasPct);  Serial.println(" %");
  Serial.print("Cahaya     : "); Serial.print(cahaya);  Serial.println(" %");
  Serial.print("Arus       : "); Serial.print(current, 2); Serial.println(" A");
  Serial.print("PIR        : "); Serial.println(pirState ? "Gerakan" : "Tidak");
  Serial.println("===============");

  delay(1000);
}