Talking Color Detect System | Arduino | DFPlayer | GY-31 TCS

#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
void printDetail(uint8_t type, int value);

#define S0 4
#define S1 5
#define S2 7
#define S3 6
#define sensorOut 8

int frequency = 0;
int color=0;

void setup() {
  mySoftwareSerial.begin(9600);
  Serial.begin(115200);
  
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
  pinMode(sensorOut, INPUT);
  //Setting frequency-scaling
  digitalWrite(S0, HIGH);
  digitalWrite(S1, LOW);

  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 loop() {
  
  color = readColor();
  delay(10);  
  switch (color) {
    case 1:
    Serial.println("RED detected!");
    myDFPlayer.play(1);
    break;
    case 2:
    Serial.println("BLUE detected!");
    myDFPlayer.play(2);
    break;
    case 3:
    Serial.println("GREEN detected!");
    myDFPlayer.play(3);
    break;
    case 0:
    break;
  }
  color=0;
}


//Read-Color Function
int readColor() {
  
  //Setting red filtered photodiodes to be read
  digitalWrite(S2, LOW);
  digitalWrite(S3, LOW);
  
  //Reading the output frequency
  frequency = pulseIn(sensorOut, LOW);
  int R = frequency;
  
  //Printing the value on the serial monitor
  Serial.print("R= ");  //printing name
  Serial.print(frequency);  //printing RED color frequency
  Serial.print("  ");
  delay(50);
  
  //Setting Green filtered photodiodes to be read
  digitalWrite(S2, HIGH);
  digitalWrite(S3, HIGH);
  
  //Reading the output frequency
  frequency = pulseIn(sensorOut, LOW);
  int G = frequency;
  
  //Printing the value on the serial monitor
  Serial.print("G= ");  //printing name
  Serial.print(frequency);  //printing RED color frequency
  Serial.print("  ");
  delay(50);
  
  //Setting Blue filtered photodiodes to be read
  digitalWrite(S2, LOW);
  digitalWrite(S3, HIGH);
  
  //Reading the output frequency
  frequency = pulseIn(sensorOut, LOW);
  int B = frequency;
  
  //Printing the value on the serial monitor
  Serial.print("B= ");  //printing name
  Serial.print(frequency);  //printing RED color frequency
  Serial.println("  ");
  delay(50);
  
  if(R<260 & R>230 & G<860 & G>800){
    color = 1; // Red
  }
  if(G<420 & G>370 & B<350 & B>305){
    color = 2; // Blue
  }
  if(R<450 & R>420 & G<420 & G>390){
    color = 3; // Green
  }
  return color;  
}