Object Detection rev_06

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    - Project: Object Detection
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-07-05 01:21:30

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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 updateOutputs(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 = LOW;

/***** 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
  if (!myDFPlayer.begin(mp3player_DFPlayerMini_Serial, true, true)) {
    // Handle initialization failure if needed
  }
}

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

void updateOutputs()
{
  digitalWrite(ultrasonicsensor_HC-SR04_Trigger_PIN_D2, ultrasonicsensor_HC_SR04_Trigger_PIN_D2_rawData);
}

void checkObjectDetection()
{
  // Read distance from ultrasonic sensor
  int distance_cm = ultrasonicSensor.read(); // in centimeters
  // Define threshold distance in cm for object detection
  const int detectionThreshold = 20; // e.g., 20 cm
  if (distance_cm > 0 && distance_cm <= detectionThreshold)
  {
    // Object detected within threshold
    // Play sound via DFPlayer
    myDFPlayer.play(1); // Play the designated MP3 sound (e.g., sound index 1)
  }
}

/* END CODE */