Proximity Indicator rev_02

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    - Project: Proximity Indicator
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-10-24 16:06:14

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* his code will connections | Component | Arduino */
    /* Pin | | ------------------------ | */
    /* ------------------------------------- | | IR */
    /* Sensor OUT | D2 | | Ultrasonic TRIG | D3 | | */
    /* Ultrasonic ECHO | D4 | | Road Green LED | D5 | | */
    /* Footpath Green LED | D6 | | */
/****** SYSTEM REQUIREMENT 2 *****/
    /* connections | Component | Arduino Pin | | */
    /* ------------------------ | */
    /* ------------------------------------- | | IR */
    /* Sensor OUT | D2 | | Ultrasonic TRIG | D3 | | */
    /* Ultrasonic ECHO | D4 | | Road Green LED | D5 | | */
    /* Footpath Green LED | D6 | | Road Red LED | */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Ultrasonic.h> //https://github.com/ErickSimoes/Ultrasonic

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t IR_SENSOR_PIN     = 2; // Sensor OUT (IR)

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t VariableControlPotentiometer_Potentiometer_Vout_PIN_A0        = A0; // Potentiometer for threshold tuning

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t ROAD_GREEN_LED_PIN        = 5; // Road Green LED
const uint8_t FOOTPATH_GREEN_LED_PIN    = 6; // Footpath Green LED
const uint8_t ROAD_RED_LED_PIN      = 7; // Road Red LED

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
const uint8_t ULTRASONIC_TRIG_PIN   = 3; // Ultrasonic TRIG
const uint8_t ULTRASONIC_ECHO_PIN   = 4; // Ultrasonic ECHO
Ultrasonic ultrasonic(ULTRASONIC_TRIG_PIN, ULTRASONIC_ECHO_PIN);

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

    pinMode(IR_SENSOR_PIN, INPUT);
    pinMode(ROAD_GREEN_LED_PIN, OUTPUT);
    pinMode(FOOTPATH_GREEN_LED_PIN, OUTPUT);
    pinMode(ROAD_RED_LED_PIN, OUTPUT);

    // Potentiometer is read as analog input; no need to pinMode
    // Initialize outputs
    digitalWrite(ROAD_GREEN_LED_PIN, LOW);
    digitalWrite(FOOTPATH_GREEN_LED_PIN, LOW);
    digitalWrite(ROAD_RED_LED_PIN, LOW);

}


void loop(void)
{
    // Read distance in centimeters (default unit CM)
    int distanceCM = ultrasonic.read();
    // Read potentiometer to adjust threshold dynamically (20-100 cm)
    int threshold = map(analogRead(VariableControlPotentiometer_Potentiometer_Vout_PIN_A0), 0, 1023, 20, 100);
    // Read IR sensor (ACTIVE HIGH means object detected)
    bool irDetected = digitalRead(IR_SENSOR_PIN) == HIGH;

    if (irDetected) {
        // If IR detects something (e.g., obstacle), show stop
        digitalWrite(ROAD_GREEN_LED_PIN, LOW);
        digitalWrite(FOOTPATH_GREEN_LED_PIN, LOW);
        digitalWrite(ROAD_RED_LED_PIN, HIGH);
    } else {
        // Otherwise use distance threshold
        if (distanceCM > threshold) {
            digitalWrite(ROAD_GREEN_LED_PIN, HIGH);
            digitalWrite(FOOTPATH_GREEN_LED_PIN, HIGH);
            digitalWrite(ROAD_RED_LED_PIN, LOW);
        } else {
            digitalWrite(ROAD_GREEN_LED_PIN, LOW);
            digitalWrite(FOOTPATH_GREEN_LED_PIN, LOW);
            digitalWrite(ROAD_RED_LED_PIN, HIGH);
        }
    }

    delay(100);
}

/* END CODE */