Object Detection Sound rev_04

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    - Project: Object Detection Sound
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-07-05 00:46:37

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* The system should use the HC-SR04 ultrasonic */
    /* sensor to detect items in the outdoor bin and play */
    /* a designated MP3 sound via the DFPlayer Mini when */
    /* an object is detected. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

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

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

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t ultrasonicsensor_HC-SR04_Echo_PIN_D3 = 3;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t ultrasonicsensor_HC-SR04_Trigger_PIN_D2 = 2;

/***** DEFINITION OF Software Serial *****/
const uint8_t mp3player_DFPlayerMini_Serial_PIN_SERIAL_TX_A0 = A0;
const uint8_t mp3player_DFPlayerMini_Serial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial mp3player_DFPlayerMini_Serial(mp3player_DFPlayerMini_Serial_PIN_SERIAL_RX_A1, mp3player_DFPlayerMini_Serial_PIN_SERIAL_TX_A0);

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
/***** used to store raw data *****/
bool ultrasonicsensor_HC-SR04_Trigger_PIN_D2_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float ultrasonicsensor_HC-SR04_Trigger_PIN_D2_phyData = 0.0;

/****** LIBRARY CLASS INSTANCES *****/
Ultrasonic ultrasonicSensor(ultrasonicsensor_HC-SR04_Trigger_PIN_D2, ultrasonicsensor_HC-SR04_Echo_PIN_D3);
DFRobotDFPlayerMini myDFPlayer;

void setup(void)
{
  // put your setup code here, to run once:
  pinMode(ultrasonicsensor_HC-SR04_Echo_PIN_D3, INPUT);
  pinMode(ultrasonicsensor_HC-SR04_Trigger_PIN_D2, OUTPUT);
  mp3player_DFPlayerMini_Serial.begin(9600);

  // Initialize DFPlayer Mini
  if (!myDFPlayer.begin(mp3player_DFPlayerMini_Serial, true, true))
  {
    // Initialization failed
    while (true)
    {
      // Halt execution
    }
  }
}

void loop(void)
{
  // Check for object detection and play sound if detected
  checkObjectAndPlaySound();
  delay(200); // Small delay to prevent rapid repeated triggers
}

void checkObjectAndPlaySound(void)
{
  // Read distance in centimeters
  int distance = ultrasonicSensor.read();
  // Define threshold distance in centimeters for object detection
  const int detectionThreshold = 20; // Adjust as needed

  if (distance > 0 && distance <= detectionThreshold)
  {
    // Object detected within threshold distance
    // Play designated MP3 sound
    myDFPlayer.play(1); // Play the first sound file
    // Optional: Add delay or flag to prevent repeated triggers
  }
}

/* END CODE */