Ultrasonic Display rev_01

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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 <Wire.h>
#include <LiquidCrystal_I2C.h>  //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 */