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	- Project: Ultrasonic Display
	- Source Code NOT compiled for: Arduino Uno
	- Source Code created on: 2024-07-25 04:13:25

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Arduino program calculates distance with SR04 */
	/* displayed in LCD I2C in the form of numbers and */
	/* bar graphs */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include 	//https://github.com/marcoschwartz/LiquidCrystal_I2C

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs(void);
float readDistance(void);
void displayDistance(float distance);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t sr04_HC_SR04_Echo_PIN_D3		= 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t sr04_HC_SR04_Trigger_PIN_D2		= 2;

/***** DEFINITION OF I2C PINS *****/
const uint8_t lcd_LCD1602I2C_I2C_PIN_SDA_A4		= A4;
const uint8_t lcd_LCD1602I2C_I2C_PIN_SCL_A5		= A5;
const uint8_t lcd_LCD1602I2C_I2C_SLAVE_ADDRESS		= 39;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES *****/
// Initialize the LiquidCrystal_I2C object with the I2C address and dimensions
LiquidCrystal_I2C lcd(lcd_LCD1602I2C_I2C_SLAVE_ADDRESS, 20, 4); // 20 columns and 4 rows

void setup(void)
{
	// Set up the pins for the ultrasonic sensor
	pinMode(sr04_HC_SR04_Echo_PIN_D3, INPUT);
	pinMode(sr04_HC_SR04_Trigger_PIN_D2, OUTPUT);

	// Initialize the LCD
	lcd.init(); // Initialize the LCD
	lcd.backlight(); // Turn on the backlight
}

void loop(void)
{
	// Read the distance from the ultrasonic sensor
	float distance = readDistance();
	
	// Update the LCD display with the distance
	displayDistance(distance);

	// Wait for a short period before the next reading
	delay(1000); // Delay for 1 second
}

float readDistance()
{
	// Clear the trigger pin
	digitalWrite(sr04_HC_SR04_Trigger_PIN_D2, LOW);
	delayMicroseconds(2);
	
	// Set the trigger pin high for 10 microseconds
	digitalWrite(sr04_HC_SR04_Trigger_PIN_D2, HIGH);
	delayMicroseconds(10);
	digitalWrite(sr04_HC_SR04_Trigger_PIN_D2, LOW);
	
	// Read the echo pin
	long duration = pulseIn(sr04_HC_SR04_Echo_PIN_D3, HIGH);
	
	// Calculate the distance in cm (speed of sound is 34300 cm/s)
	float distance = (duration * 0.0343) / 2; // Divide by 2 for the round trip
	return distance;
}

void displayDistance(float distance)
{
	// Clear the LCD before displaying new data
	lcd.clear();
	
	// Display the distance in cm
	lcd.setCursor(0, 0);
	lcd.print("Distance: ");
	lcd.print(distance);
	lcd.print(" cm");

	// Display a simple bar graph based on the distance
	lcd.setCursor(0, 1);
	lcd.print("Bar: ");
	int barLength = map(distance, 0, 200, 0, 16); // Map distance to bar length (max 16)
	for (int i = 0; i < barLength; i++) {
		lcd.write(255); // Print a filled block character
	}
}

/* END CODE */