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	- Project: "Distance-controlled Fan"
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2024-04-05 18:22:50

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Turn on the fan of the command is 1 and turn off */
	/* the fan of the command is 0 and also turn off the */
	/* util any object near the ultrasonic sensor and */
	/* again turn on the fan when the object moves away */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include     // Include the Ultrasonic library
#include     // Include the DHT library

/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
/* Turn on the fan if the command is 1 and turn off */
/* the fan if the command is 0. Also, turn off the */
/* fan if any object is near the ultrasonic sensor */
/* and turn on the fan when the object moves away */
/****** END SYSTEM REQUIREMENTS *****/

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);  // Add function prototype for updateOutputs function

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t Temp_DHT11_DOUT_PIN_D2 = 2;
const uint8_t Ult_HC_SR04_Echo_PIN_D4 = 4;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t Ult_HC_SR04_Trigger_PIN_D3 = 3;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool Ult_HC_SR04_Trigger_PIN_D3_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float Ult_HC_SR04_Trigger_PIN_D3_phyData = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Ultrasonic ultrasonic(Ult_HC_SR04_Trigger_PIN_D3, Ult_HC_SR04_Echo_PIN_D4);  // Create an instance of the Ultrasonic class

DHT dht(Temp_DHT11_DOUT_PIN_D2, DHT11);  // Create an instance of the DHT class with DHT11 sensor type

bool fanStatus = false;  // Variable to store the current status of the fan

void setup(void)
{
    // put your setup code here, to run once:

    pinMode(Temp_DHT11_DOUT_PIN_D2, INPUT_PULLUP);
    pinMode(Ult_HC_SR04_Echo_PIN_D4, INPUT);
    pinMode(Ult_HC_SR04_Trigger_PIN_D3, OUTPUT);

    dht.begin();  // Initialize the DHT sensor

}

void loop(void)
{
    // put your main code here, to run repeatedly:

    updateOutputs(); // Refresh output data

    // Read the distance from the ultrasonic sensor
    unsigned int distance = ultrasonic.read();

    // Check if an object is detected within a certain distance
    if (distance < 20 && !fanStatus) {
        // Turn on the fan
        Ult_HC_SR04_Trigger_PIN_D3_rawData = 1;
        fanStatus = true;
    } else if (distance >= 20 && fanStatus) {
        // Turn off the fan
        Ult_HC_SR04_Trigger_PIN_D3_rawData = 0;
        fanStatus = false;
    }

    // Add your code here to read other sensor data and update variables

    delay(1000);  // Wait for 1 second before checking again
}

void updateOutputs()
{
    digitalWrite(Ult_HC_SR04_Trigger_PIN_D3, Ult_HC_SR04_Trigger_PIN_D3_rawData);
}