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	- Project: "Distance Relay"
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2024-01-17 01:42:13

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Relay module, */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include 

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t Ultrasonic_HC_SR04_Echo_PIN_D3 = 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t Ultrasonic_HC_SR04_Trigger_PIN_D2 = 2;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
Ultrasonic ultrasonic(Ultrasonic_HC_SR04_Trigger_PIN_D2, Ultrasonic_HC_SR04_Echo_PIN_D3);

/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
/* Relay module */
const uint8_t Relay_PIN_D4 = 4;

/****** END SYSTEM REQUIREMENTS *****/

void setup(void)
{
  // put your setup code here, to run once:
  pinMode(Ultrasonic_HC_SR04_Echo_PIN_D3, INPUT);
  pinMode(Ultrasonic_HC_SR04_Trigger_PIN_D2, OUTPUT);
  
  pinMode(Relay_PIN_D4, OUTPUT);
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  
  // Read distance from ultrasonic sensor
  unsigned int distance = ultrasonic.read();
  
  // Check if distance is less than 30 cm
  if(distance < 30)
  {
    // Activate relay module
    digitalWrite(Relay_PIN_D4, HIGH);
  }
  else
  {
    // Deactivate relay module
    digitalWrite(Relay_PIN_D4, LOW);
  }
  
  delay(1000);
}