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	- Project: Human Detection
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2024-04-01 21:42:32

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* activates a relay when the presence of a human is */
	/* detected */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Ultrasonic.h>  // Include the Ultrasonic library
#include <Wire.h>       // Include the Wire library for relay control

/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
/* activates a relay when the presence of a human is */
/* detected */

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t ultrasonicEchoPin = 3;   // Define the Echo pin

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t ultrasonicTriggerPin = 2;   // Define the Trigger pin
const uint8_t relayPin = 4;                // Define the relay pin

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

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float ultrasonicTriggerPinPhyData = 0.0;   // Define variable to store transformed data

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Ultrasonic ultrasonic(ultrasonicTriggerPin, ultrasonicEchoPin);   // Create an Ultrasonic object

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

  pinMode(ultrasonicEchoPin, INPUT);   // Set Echo pin as input

  pinMode(ultrasonicTriggerPin, OUTPUT);   // Set Trigger pin as output

  pinMode(relayPin, OUTPUT);   // Set relay pin as output

  Serial.begin(9600);   // Start the serial communication

}

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

  int distance = ultrasonic.read();   // Read the distance in centimeters

  Serial.print("Distance in CM: ");
  Serial.println(distance);

  if (distance < 50)   // Check if the distance is less than 50cm
  {
    activateRelay();   // Call the function to activate the relay
  }
  else
  {
    digitalWrite(relayPin, LOW);   // Turn off the relay
  }

  delay(1000);   // Wait for 1 second
}

void activateRelay(void)
{
  digitalWrite(relayPin, HIGH);   // Turn on the relay
}