**Sensor Control** rev_01

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    - Project: **Sensor Control**
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2024-12-21 07:44:32

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Logic for dry box where pin 3 is used for dht11 to */
    /* maintain temperature between 25C-35C and humidity */
    /* between 35%-45%. The relay for bulb at pin 4, */
    /* temperature up and down switches on pin 5 and 6 */
    /* respectively and humidity up-down switches at 7 */
    /* lcd i2c */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// Pin definitions
#define DHTPIN 3          // DHT11 sensor pin
#define DHTTYPE DHT11     // DHT 11
#define RELAY_PIN 4       // Relay for bulb
#define TEMP_UP_PIN 5     // Temperature up switch
#define TEMP_DOWN_PIN 6   // Temperature down switch
#define HUMIDITY_UP_PIN 7 // Humidity up switch

// Create instances of DHT and LCD
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the address and size as needed

void setup(void)
{
    // Initialize the DHT sensor
    dht.begin();

    // Initialize the LCD
    lcd.begin(16, 2);
    lcd.backlight();

    // Set pin modes
    pinMode(RELAY_PIN, OUTPUT);
    pinMode(TEMP_UP_PIN, INPUT);
    pinMode(TEMP_DOWN_PIN, INPUT);
    pinMode(HUMIDITY_UP_PIN, INPUT);

    // Display initial message
    lcd.print("Dry Box Ready");
}

void loop(void)
{
    // Read temperature and humidity
    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();

    // Check if any reads failed
    if (isnan(humidity) || isnan(temperature)) {
        lcd.print("Error reading");
        return;
    }

    // Display temperature and humidity on LCD
    lcd.setCursor(0, 1);
    lcd.print("T:");
    lcd.print(temperature);
    lcd.print(" H:");
    lcd.print(humidity);

    // Control relay based on temperature and humidity
    if (temperature < 25) {
        digitalWrite(RELAY_PIN, HIGH); // Turn on the bulb
    } else if (temperature > 35) {
        digitalWrite(RELAY_PIN, LOW); // Turn off the bulb
    }

    // Control temperature up/down switches
    if (digitalRead(TEMP_UP_PIN) == HIGH) {
        // Logic to increase temperature
        // (e.g., turn on heater)
    }
    if (digitalRead(TEMP_DOWN_PIN) == HIGH) {
        // Logic to decrease temperature
        // (e.g., turn on cooler)
    }

    // Control humidity up switch
    if (digitalRead(HUMIDITY_UP_PIN) == HIGH) {
        // Logic to increase humidity
        // (e.g., turn on humidifier)
    }

    delay(2000); // Wait before next reading
}

/* END CODE */