Electronics and Programming

Testing PIR with the Speaker using Arduino

1. First I downloaded a Dog barking sound from Youtube in mp3 format. Then I had to change the audio file from mp3 to wav format so that the SD Card Module can read.To do so I used an online convertor

2. Then after getting the audio in wav format, my next step was to do the connections of the components.

3. After the connections were completed, I transferred the wav audio file to the SD card.
4. Now programming, I got the code from here and I made some changes according to my connections.

  #include "SD.h"
  #define SD_ChipSelectPin 4
  #include "TMRpcm.h"
  #include "SPI.h"
  
  TMRpcm tmrpcm;
  
  void setup()
  {
    
  
  pinMode(7,INPUT);
  delay(500);
  }
  
  void loop()
  {
  
  if(digitalRead(7)==HIGH)
  {
   
    AudioPlay();
    delay(3000);
    }
    }
  
  void AudioPlay()
  { 
  tmrpcm.speakerPin = 9;
  Serial.begin(9600);
  if (!SD.begin(SD_ChipSelectPin)) {
  Serial.println("SD fail");
  return;
  }
  
  tmrpcm.setVolume(5);
  tmrpcm.play("dogbarking.wav");
  }
  
  

5. After the code got uploaded and compiled, I couldn't hear the audio. Just some buzzing sound which was a disappointment.

Using DFplayer in place of Mp3 module

1. Mr.Rico upon arrival to Bhutan to guide us to complete our Final project on time, he brought with him the Dfplayer which was much more user friendly and I didnt even need to change the sound format to wav form.
2. This is the pinout for the df player mini.

3. I referred this Youtube Video which was similar to what I was trying to achieve.
4. Connections made between DFplayer, Speaker and the board with the PIR sensor.

5. After the connections were made, I got the code from the same youtube video and had to change the pins according to my connections.

  #include "SoftwareSerial.h"
  #include "DFRobotDFPlayerMini.h"
  
  SoftwareSerial mySoftwareSerial(2, 1); // RX, TX
  DFRobotDFPlayerMini myDFPlayer;
  void printDetail(uint8_t type, int value);
  
  #define SENSORPIN 0
  #define PAUSETIME 1000
  
  void setup() {
    mySoftwareSerial.begin(9600);
    Serial.begin(115200);
    pinMode(SENSORPIN, INPUT);
  
    Serial.println();
    Serial.println(F("Initializing DFPlayer..."));
  
    //Use softwareSerial to communicate with MP3
    if (!myDFPlayer.begin(mySoftwareSerial)) {
      Serial.println(F("Unable to begin:"));
      Serial.println(F("1.Please recheck the connection!"));
      Serial.println(F("2.Please insert the SD card!"));
      while(true);
    }
    Serial.println(F("DFPlayer Mini online."));
  
    //Set volume value (From 0 to 30)
    myDFPlayer.volume(30);
  }
  
  void sensorActivated() {
    int pirSensor = digitalRead(SENSORPIN);
    if(pirSensor == HIGH)
    {
      Serial.println("Sensor Activated");
      Serial.println("DFPlayer Working...");
      myDFPlayer.play(1);
    }
    return;
  }
  
  void loop() {
    sensorActivated();
    delay(PAUSETIME);
  }
  
  

6. This is a working video of the speaker with PIR sensor and different output sounds.

Final Code and Final Connections of All output(Speaker and LED) and all Input(PIR and LDR)

1. This is the final code used. I compiled the LDR and PIR with LED and Speaker code.

  ba#include "SoftwareSerial.h"
 #include "DFRobotDFPlayerMini.h"
 
 SoftwareSerial mySoftwareSerial(2, 1); //RX, Tx
 DFRobotDFPlayerMini myDFPlayer;
 void printDetail(uint8_t type, int value);
 
 int LDRInput=3; //Set Analog Input 3 for LDR.
 int LED=4;
 #define SENSORPIN 0
 #define PAUSETIME 1000
 
 void setup() {
   mySoftwareSerial.begin(9600);
   Serial.begin(115200);
 
   pinMode(LDRInput,INPUT);
   pinMode(SENSORPIN, INPUT);
   pinMode(LED,OUTPUT);
   
   Serial.println();
   Serial.println(F("Initializing DFPlayer..."));
 
   if (!myDFPlayer.begin(mySoftwareSerial)) {
     Serial.println(F("Unable to Begin:"));
     Serial.println(F("1.Please recheck the connection!"));
     Serial.println(F("2.Please insert the SD card!"));
     while(true);
   }
   Serial.println(F("DFPlayer Mini online."));
 
   myDFPlayer.volume(30);
 }
 
 void sensorActivated() {
   int pirSensor = digitalRead(SENSORPIN);
   if(pirSensor == HIGH)
   {
     Serial.println("Sensor Activated");
     Serial.println("DFPlayer Working.....");
     myDFPlayer.play(1);
     for (int i = 0; i<=3; i++){
     digitalWrite(LED,HIGH);//The LED turns ON in Dark.
     delay(300);
     digitalWrite(LED,LOW);//The LED turns OFF in Light.
     delay(300);
     }
   }
   return;
 }
 
  void loop() {
  
   int value=analogRead(LDRInput);//Reads the Value of LDR(light).
 Serial.println("LDR value is :");//Prints the value of LDR to Serial Monitor.
 Serial.println(value);
 if(value<850)
   {
     digitalWrite(LED,HIGH);//The LED turns ON in Dark.
   }
   else
   {
     digitalWrite(LED,LOW);//The LED turns OFF in Light.
   }
 
   sensorActivated();
   delay(PAUSETIME);
  }
 
 

2. This is the video of How it worked.

Design Files