OutdoorBinSoundActivation rev_02

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    - Project:
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-07-04 22:12:16

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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 checkObjectDetection(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;

/***** Instantiate Ultrasonic sensor object *****/
Ultrasonic ultrasonicSensor(ultrasonicsensor_HC_SR04_Echo_PIN_D3);

/***** Detection threshold in centimeters *****/
const float detectionThreshold = 20.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
DFRobotDFPlayerMini mp3Player;

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 MP3 Player
  if (!mp3Player.begin(mp3player_DFPlayerMini_Serial)) {
    // Initialization failed
    while(true);
  }
  mp3Player.volume(20); // Set volume level (0-30)
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  checkObjectDetection();
}

void checkObjectDetection()
{
  // Read distance from ultrasonic sensor
  float distance = ultrasonicSensor.read();

  // Check if object is within detection threshold
  if (distance > 0 && distance <= detectionThreshold)
  {
    // Play sound if not already playing
    if (!mp3Player.isPlaying())
    {
      mp3Player.play(1); // Play the first track
    }
  }
  else
  {
    // Optional: stop playback if no object
    // mp3Player.stop();
  }
  delay(200); // Small delay to prevent rapid triggering
}

/* END CODE */