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	- Project: "Arduino Distance Measurement"
	- Source Code compiled for: Arduino Uno
	- Source Code created on: 2023-12-29 21:26:37

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* turn rgb led light to red and print "Out of Range" */
	/* on display when sensor isn't detecting any objects */
	/* and green when it detects objects with printing */
	/* the distance of object from sensor in mm */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Arduino.h>
#include <Wire.h>
#include <Ultrasonic.h>
#include <LiquidCrystal_I2C.h>

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t sensor_HC_SR04_Echo_PIN_D3 = 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t indicator_LEDRGB_Red_PIN_D2 = 2;
const uint8_t indicator_LEDRGB_Green_PIN_D4 = 4;
const uint8_t indicator_LEDRGB_Blue_PIN_D5 = 5;

/***** DEFINITION OF I2C PINS *****/
const uint8_t display_LCD1602I2C_I2C_PIN_SDA_A4 = A4;
const uint8_t display_LCD1602I2C_I2C_PIN_SCL_A5 = A5;
const uint8_t display_LCD1602I2C_I2C_SLAVE_ADDRESS = 39;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES *****/
Ultrasonic ultrasonic(sensor_HC_SR04_Echo_PIN_D3);
LiquidCrystal_I2C lcd(display_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2);  // Initialize LCD object

void setup(void)
{
  pinMode(sensor_HC_SR04_Echo_PIN_D3, INPUT);
  pinMode(indicator_LEDRGB_Red_PIN_D2, OUTPUT);
  pinMode(indicator_LEDRGB_Green_PIN_D4, OUTPUT);
  pinMode(indicator_LEDRGB_Blue_PIN_D5, OUTPUT);

  lcd.begin(16, 2);  // Initialize LCD
  lcd.backlight();  // Turn on LCD backlight
}

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

  if (distance == 0) {
    // No object detected
    digitalWrite(indicator_LEDRGB_Red_PIN_D2, HIGH);  // Turn on red LED
    digitalWrite(indicator_LEDRGB_Green_PIN_D4, LOW);  // Turn off green LED
    lcd.clear();  // Clear the LCD display
    lcd.setCursor(0, 0);
    lcd.print("Out of Range");
  } else {
    // Object detected
    digitalWrite(indicator_LEDRGB_Red_PIN_D2, LOW);  // Turn off red LED
    digitalWrite(indicator_LEDRGB_Green_PIN_D4, HIGH);  // Turn on green LED
    lcd.clear();  // Clear the LCD display
    lcd.setCursor(0, 0);
    lcd.print("Distance: ");
    lcd.print(distance);
    lcd.print(" mm");
  }

  delay(1000);  // Wait for 1 second before taking the next reading
}