Pengkodean & Debugging Sistem

#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// ── Konfigurasi Pin ──
#define DHT_PIN     2
#define SOIL_PIN    A0
#define LDR_PIN     A1
#define PIR_PIN     3
#define POMPA_PIN   7
#define BUZZER_PIN  8
#define LED_R       9
#define LED_G       10
#define LED_B       11

DHT dht(DHT_PIN, DHT11);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// ── Batas Ambang (Thresholds) ──
const float SUHU_MAX       = 35.0;
const int   TANAH_KERING   = 30;   // %
const int   CAHAYA_REDUP   = 400;

// ── Variabel Non-blocking Timers (millis) ──
unsigned long prevSensor = 0, prevLCD = 0;
const long INTERVAL_SENSOR = 2000, INTERVAL_LCD = 1000;

// ── Status Sistem ──
float suhu = 0, kelembaban = 0;
int tanahPct = 0, cahaya = 0;
bool pompaNyala = false;

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init(); 
  lcd.backlight();
  
  pinMode(POMPA_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_R, OUTPUT); pinMode(LED_G, OUTPUT); pinMode(LED_B, OUTPUT);
  
  Serial.println("=== Smart Agriculture System v1.0 ===");
}

void bacaSemua() {
  suhu       = dht.readTemperature();
  kelembaban = dht.readHumidity();
  // Konversi nilai ADC analog tanah menjadi persen (0-100%)
  // Sesuaikan nilai 850 (kering) dan 350 (basah) dengan hasil kalibrasi kalian
  tanahPct   = constrain(map(analogRead(SOIL_PIN), 850, 350, 0, 100), 0, 100);
  cahaya     = analogRead(LDR_PIN);
}

void kontrolAktuator() {
  // 1. Auto watering: Nyalakan pompa jika tanah kering
  pompaNyala = (tanahPct < TANAH_KERING);
  digitalWrite(POMPA_PIN, pompaNyala);
  
  // 2. Status LED Visual
  bool ada_masalah = (suhu > SUHU_MAX) || (tanahPct < TANAH_KERING);
  analogWrite(LED_R, ada_masalah ? 255 : 0);
  analogWrite(LED_G, ada_masalah ? 0 : 255);
  analogWrite(LED_B, 0); // Biru dimatikan sementara
  
  // 3. Alarm Suhu Panas
  if (suhu > SUHU_MAX) { 
    tone(BUZZER_PIN, 1000, 500); 
  } else {
    noTone(BUZZER_PIN);
  }
}

void updateLCD() {
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print("T:"); lcd.print(suhu,1); lcd.print("C H:"); lcd.print(kelembaban,0); lcd.print("%");
  
  lcd.setCursor(0,1); 
  lcd.print("Tanah:"); lcd.print(tanahPct); lcd.print("% P:"); lcd.print(pompaNyala ? "ON" : "OFF");
}

void loop() {
  unsigned long now = millis();
  
  // Interval pembacaan sensor dan aksi aktuator
  if (now - prevSensor >= INTERVAL_SENSOR) {
    prevSensor = now;
    bacaSemua();
    kontrolAktuator();
    
    // Debugging via Serial
    Serial.print("T:"); Serial.print(suhu); 
    Serial.print("C | Tanah:"); Serial.print(tanahPct); Serial.println("%");
  }
  
  // Interval update LCD terpisah
  if (now - prevLCD >= INTERVAL_LCD) {
    prevLCD = now;
    updateLCD();
  }
}