add example for receive

DFPlayer_Mini_Mp3/examples/DFPlayer_receive/DFPlayer_receive.ino

@@ -0,0 +1,106 @@
+/*******************************************************************************
+ * DFPlayer_Mini_Mp3, This library provides a quite complete function for      * 
+ * DFPlayer mini mp3 module.                                                   *
+ * www.github.com/dfrobot/DFPlayer_Mini_Mp3 (github as default source provider)*
+ *  DFRobot-A great source for opensource hardware and robot.                  *
+ *                                                                             *
+ * This file is part of the DFplayer_Mini_Mp3 library.                         *
+ *                                                                             *
+ * DFPlayer_Mini_Mp3 is free software: you can redistribute it and/or          *
+ * modify it under the terms of the GNU Lesser General Public License as       *
+ * published by the Free Software Foundation, either version 3 of              *
+ * the License, or any later version.                                          *
+ *                                                                             *
+ * DFPlayer_Mini_Mp3 is distributed in the hope that it will be useful,        *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of              *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               *
+ * GNU Lesser General Public License for more details.                         *
+ *                                                                             *
+ * DFPlayer_Mini_Mp3 is distributed in the hope that it will be useful,        *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of              *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               *
+ * GNU Lesser General Public License for more details.                         *
+ *                                                                             *
+ * You should have received a copy of the GNU Lesser General Public            *
+ * License along with DFPlayer_Mini_Mp3. If not, see                           *
+ * <http://www.gnu.org/licenses/>.                                             *
+ *									       *
+ ******************************************************************************/
+
+/*
+ *	Copyright:	DFRobot
+ *	name:		DFPlayer_receive test code
+ *	Author:		ciotto <ciotto@users.noreply.github.com>
+ *	Date:		2016-06-29
+ *	Description:	Example of use of mp3 library for DFPlayer mini board
+ *
+ *	this code read number of tracks in the SD card folders 01 - 02 and
+ *	random play one track
+ * 
+ *  The circuit:
+ *    * DFR0299 mp3 player attached to pins 19, 18 (serial), 6 (buzy) and power
+ *    * speaker attached to DFR0299 pin 6 and 8
+ *    
+ *  This code is based on CaprerAVR project <https://github.com/ciotto/CaprerAVR>
+ */
+
+#include <SoftwareSerial.h>
+#include <DFPlayer_Mini_Mp3.h>
+
+// costants
+const int busyPin = 6;              // Arduino pin wired to DFR0299 16 pin
+const int volume = 20;              // the volume level
+const int foldersCount = 2;              // the volume level
+
+// variables
+int tracks[foldersCount] = {0, 0};              // tracks in microSD
+
+void setup() {
+  // Init serial
+  Serial1.begin (9600);
+  Serial.begin (9600);
+  while (!Serial);
+
+  // Set Serial for DFPlayer-mini mp3 module
+  mp3_set_serial(Serial1);
+  // Set logging Serial
+  mp3_set_debug_serial(Serial);
+  // Set volume (value 0~30)
+  mp3_set_volume(volume);
+  // Set device to microSD
+  mp3_set_device(2);
+
+  for (int i=0; i < foldersCount; i++) {
+    // Query the total number of microSD card files
+    mp3_get_folder_sum(i + 1);
+    tracks[i] = mp3_wait_folder_sum();
+
+    Serial.print("Find ");
+    Serial.print(tracks[i]);
+    Serial.print(" tracks in folder 0");
+    Serial.print(i);
+    Serial.println(".");
+  }
+}
+
+void loop() {
+  // Read buzy state
+  int busyState = digitalRead(busyPin);
+
+  // check if the DFR0299 is not buzy.
+  if (busyState == 1) {
+      // Play random file in random folder
+      int folder = random(1, foldersCount + 1);
+      int track = random(1, tracks[folder - 1] + 1);
+
+      mp3_play_file_in_folder(folder, track);
+
+      Serial.print("Play track ");
+      Serial.print(track);
+      Serial.print(" in folder ");
+      Serial.println(folder);
+  }
+
+  delay(500);
+}
+