diff --git a/platformio.ini b/platformio.ini
index ea23b77..9bc99c0 100755
--- a/platformio.ini
+++ b/platformio.ini
@@ -12,3 +12,4 @@
 platform = atmelavr
 board = uno
 framework = arduino
+lib_deps = https://github.com/DFRobot/DFRobotDFPlayerMini
diff --git a/src/main.cpp b/src/main.cpp
index 8453716..8a0795d 100755
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,31 +1,42 @@
 #include <Arduino.h>
-#define LED 13
+#include <SoftwareSerial.h>
+#include "DFRobotDFPlayerMini.h"
 
-void displayMicros();
-void displayMillis();
+int music_num;
+SoftwareSerial mySoftwareSerial(10, 11); // #1
+DFRobotDFPlayerMini myDFPlayer; // #2
 
 // Setup Section
 void setup() {
-	Serial.begin(9600);
-	pinMode(LED, OUTPUT);
-	attachInterrupt(0, displayMicros, RISING); // #1
-	attachInterrupt(1, displayMillis, RISING);
-}
-
-void displayMicros() {
-	Serial.write("micros() = ");
-	Serial.println(micros());
-}
-
-void displayMillis() {
-	Serial.write("millis() = ");
-	Serial.println(millis());
+	mySoftwareSerial.begin(9600);
+	Serial.begin(115200);
+	myDFPlayer.begin(mySoftwareSerial); // #3
+	myDFPlayer.volume(20);
 }
 
 // Loop Section
 void loop() {
-	digitalWrite(LED, HIGH);
-	delay(500);
-	digitalWrite(LED, LOW);
-	delay(500);
+	if (Serial.available() > 0) {
+		music_num = Serial.readString().toInt(); // #4
+		if (music_num < 5 && music_num > 0) {
+			switch (music_num) {
+				case 1:
+					Serial.println("1");
+					myDFPlayer.play(1);
+					break;
+				case 2:
+					Serial.println("2");
+					myDFPlayer.play(2);
+					break;
+				case 3:
+					Serial.println("3");
+					myDFPlayer.play(3);
+					break;
+				case 4:
+					Serial.println("4");
+					myDFPlayer.play(4);
+					break;
+			}
+		}
+	}
 }