Programing Help

Projects Programming
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As my final contribution here is a version for hardware serial. Read it carefully and make appropriate pin changes to suit your board, as this is for my MEGA2560, where it works correctly.

Good luck.

/*
Fri 29 Aug 2025; Revised for a board using hadware serial,
MEGA2560 in my case.
*/

#include <DFRobotDFPlayerMini.h>  // download this library from Arduino IDE "Manage Libraries"

int pirPin = 3;        // my edit
int ledPin = 13;       //Arduino built-in LED, and a more visible one
int motionStatus = 0;  // variable to store the PIR's current reading (high or low)
int pirState = 0;      // variable to store the PIR's state change
int track = 1;         // variable to store current track number

// Serial1: Rx=19 (to DFR Tx),Tx=18 (to 1k then DFR Rx)
DFRobotDFPlayerMini fxPlayer;

void setup()
{
  pinMode(pirPin, INPUT);   // set Arduino pin that PIR is connected to as an INPUT
  pinMode(ledPin, OUTPUT);  // my edit

  Serial.begin(115200);  // my preference
  delay(200);
  Serial1.begin(9600);
  delay(200);
  fxPlayer.begin(Serial1);  // tells mp3 player to use Serial1 for communication
  delay(1000);              // my edit
  fxPlayer.volume(15);      // my edit  // mp3 player volume (pick a value 10-30)
  delay(8000);              // my edit, allow say 8 secs for PIR sensor to settle
  Serial.println("Setup ended");
}

void loop()
{
  motionStatus = digitalRead(pirPin);  // read the PIR pin's current output (is it HIGH or LOW?)
  // if PIR pin output is HIGH:
  if (motionStatus == HIGH)
  {
    if (pirState == LOW)
    {
      Serial.println("Motion Detected");  // print result to the serial monitor
      digitalWrite(ledPin, LOW);          // turn OFF built-in LED
      pirState = HIGH;                    // update the previous PIR state to HIGH

      fxPlayer.play(track);  // play up to 3 s of current track
      // delay(1000);           // // my edit length in MILLIseconds of the current track
      // delay(5000);           // length in microseconds of the longest track
      track++;  // add 1 to the current track for the next loop

      // if track number tries to exceed 5 (I have 5 total in my case)
      if (track > 5)
      {             // change this value to match your total # of tracks
        track = 1;  // reset track number to 1
      }
    }
  }

  // or else if PIR pin output is LOW:
  else
  {
    // if (pirState == LOW)
    if (pirState == HIGH)
    {
      Serial.println("Motion Ended");  //print result to the serial monitor
      digitalWrite(ledPin, HIGH);      // turn ON built-in LED
      pirState = LOW;                  // update the previous PIR state to LOW
    }
  }
}