#include <DHT.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>


// ---- SENSOR SETTINGS ----

#define DHTPIN 2 

#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);


// ---- LCD SETTINGS ----

LiquidCrystal_I2C lcd(0x27, 20, 4);


// ---- OUTPUT PINS ----

#define FAN_PIN 3

#define HEATER_PIN 4

#define HUMIDIFIER_PIN 5


// ---- CONTROL THRESHOLDS ----

#define TEMP_HIGH 27

#define TEMP_LOW 25

#define HUMIDITY_LOW 65

#define HUMIDITY_HIGH 75

#define HUMIDITY_FAN 80


// ---- STATE VARIABLES ----

bool fanState = false;

bool heaterState = false;

bool humidifierState = false;


// ---- For scrolling ----

char row1Message[] = " MANTIS CLIMATE CONTROL ";

char row4Message[64]; // big enough for status line

int scrollIndex1 = 0;

int scrollIndex4 = 0;


unsigned long lastScroll1 = 0;

unsigned long lastScroll4 = 0;

const int scrollDelay = 400; 


unsigned long lastSensorRead = 0;

const int sensorInterval = 5000; 


void setup() {

Serial.begin(9600);

dht.begin();

lcd.init();

lcd.backlight();


lcd.setCursor(0,0);

lcd.print("Climate Control");

lcd.setCursor(0,2);

lcd.print("Mantis Care");

delay(3000);

lcd.clear();


pinMode(FAN_PIN, OUTPUT);

pinMode(HEATER_PIN, OUTPUT);

pinMode(HUMIDIFIER_PIN, OUTPUT);


digitalWrite(FAN_PIN, LOW);

digitalWrite(HEATER_PIN, LOW);

digitalWrite(HUMIDIFIER_PIN, LOW);

}


void loop() {

unsigned long now = millis();


// ---- Read DHT sensor every 2s ----

static float humidity = NAN, temperature = NAN;

if (now - lastSensorRead >= sensorInterval) {

lastSensorRead = now;

humidity = dht.readHumidity();

temperature = dht.readTemperature();


if (isnan(humidity) || isnan(temperature)) {

lcd.setCursor(0,1);

lcd.print("Sensor Error! ");

return;

}


// ---- Control outputs ----

fanState = (temperature > TEMP_HIGH || humidity > HUMIDITY_FAN);

heaterState = (temperature < TEMP_LOW);

humidifierState = (humidity < HUMIDITY_LOW);


if (humidity > HUMIDITY_HIGH) humidifierState = false;


digitalWrite(FAN_PIN, fanState);

digitalWrite(HEATER_PIN, heaterState);

digitalWrite(HUMIDIFIER_PIN, humidifierState);


// ---- Serial Debug ----

Serial.print("Temp: "); Serial.print(temperature);

Serial.print(" C Humidity: "); Serial.print(humidity);

Serial.print("% | Fan:"); Serial.print(fanState ? "ON " : "OFF");

Serial.print(" Heater:"); Serial.print(heaterState ? "ON " : "OFF");

Serial.print(" Humidifier:"); Serial.println(humidifierState ? "ON" : "OFF");


// ---- Build Row4 message safely ----

snprintf(row4Message, sizeof(row4Message),

" Fan:%s | Heat:%s | Humidifier:%s ",

fanState ? "ON" : "OFF",

heaterState ? "ON" : "OFF",

humidifierState ? "ON" : "OFF");


// ---- Update static rows ----

lcd.setCursor(0,1);

lcd.print("Temp: ");

lcd.print(temperature,1);

lcd.print((char)223);

lcd.print("C ");


lcd.setCursor(0,2);

lcd.print("Humidity: ");

lcd.print(humidity,0);

lcd.print("% ");

}


// ---- Row 1 scrolling banner ----

if (now - lastScroll1 >= scrollDelay) {

lastScroll1 = now;

int len1 = strlen(row1Message);

lcd.setCursor(0,0);

for (int i=0; i<20; i++) {

char c = row1Message[(scrollIndex1 + i) % len1];

lcd.print(c);

}

scrollIndex1 = (scrollIndex1 + 1) % len1;

}


// ---- Row 4 scrolling status ----

if (now - lastScroll4 >= scrollDelay) {

lastScroll4 = now;

int len4 = strlen(row4Message);

lcd.setCursor(0,3);

for (int i=0; i<20; i++) {

char c = row4Message[(scrollIndex4 + i) % len4];

lcd.print(c);

}

scrollIndex4 = (scrollIndex4 + 1) % len4;

}

}