@@ Línea 442: / Línea 442: @@
    analogWrite(10, difference);
    //analogWrite(11, difference);
+ if (myDFPlayer.available()) {
+    printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
+  }
+}
+int leerSensor(int pinLed, int pinSensor)
+{
+  digitalWrite(pinLed, HIGH);
+  delay(1);
+  int max_enc = 0;
+  for (int i = 0; i < 100; i++) {
+    int v = analogRead(pinSensor);
+    if (v > max_enc) max_enc = v;
+  }
+  digitalWrite(pinLed, LOW);
+  delay(1);
+  int max_apa = 0;
+  for (int i = 0; i < 100; i++) {
+    int v = analogRead(pinSensor);
+    if (v > max_apa) max_apa = v;
+  }
+   int difference = max_apa - max_enc;
+  return difference;
+}
+void printDetail(uint8_t type, int value){
+  switch (type) {
+    case TimeOut:
+      Serial.println(F("Time Out!"));
+      break;
+    case WrongStack:
+      Serial.println(F("Stack Wrong!"));
+      break;
+    case DFPlayerCardInserted:
+      Serial.println(F("Card Inserted!"));
+      break;
+    case DFPlayerCardRemoved:
+      Serial.println(F("Card Removed!"));
+      break;
+    case DFPlayerCardOnline:
+      Serial.println(F("Card Online!"));
+      break;
+    case DFPlayerUSBInserted:
+      Serial.println("USB Inserted!");
+      break;
+    case DFPlayerUSBRemoved:
+      Serial.println("USB Removed!");
+      break;
+    case DFPlayerPlayFinished:
+      Serial.print(F("Number:"));
+      Serial.print(value);
+      Serial.println(F(" Play Finished!"));
+      //myDFPlayer.next();
+      break;
+    case DFPlayerError:
+      Serial.print(F("DFPlayerError:"));
+      switch (value) {
+        case Busy:
+          Serial.println(F("Card not found"));
+          break;
+        case Sleeping:
+          Serial.println(F("Sleeping"));
+          break;
+        case SerialWrongStack:
+          Serial.println(F("Get Wrong Stack"));
+          break;
+        case CheckSumNotMatch:
+          Serial.println(F("Check Sum Not Match"));
+          break;
+        case FileIndexOut:
+          Serial.println(F("File Index Out of Bound"));
+          break;
+        case FileMismatch:
+          Serial.println(F("Cannot Find File"));
+          break;
+        case Advertise:
+          Serial.println(F("In Advertise"));
+          break;
+        default:
+          break;
+      }
+      break;
+    default:
+      break;
+  }
+}
+</syntaxhighlight>
+* Avances Código
+<syntaxhighlight lang="c++" line copy>
+/***************************************************
+DFPlayer - A Mini MP3 Player For Arduino
+ <https://www.dfrobot.com/product-1121.html>
+ ***************************************************
+ This example shows the basic function of library for DFPlayer.
+ Created 2016-12-07
+ By [Angelo qiao](Angelo.qiao@dfrobot.com)
+ GNU Lesser General Public License.
+ See <http://www.gnu.org/licenses/> for details.
+ All above must be included in any redistribution
+ ****************************************************/
+/***********Notice and Trouble shooting***************
+.Connection and Diagram can be found here
+ <https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299#Connection_Diagram>
+.This code is tested on Arduino Uno, Leonardo, Mega boards.
+ ****************************************************/
+#include "Arduino.h"
+#include "DFRobotDFPlayerMini.h"
+#include <SoftwareSerial.h>
+SoftwareSerial softSerial(/*rx =*/4, /*tx =*/5);
+#define FPSerial softSerial
+DFRobotDFPlayerMini myDFPlayer;
+void printDetail(uint8_t type, int value);
+int baselineVolume = 20;
+void setup(){
+  // sensor1
+  //pinMode(A0, INPUT_PULLUP);
+  //pinMode(8, OUTPUT);
+  // sensor2
+  pinMode(A1, INPUT_PULLUP);
+  pinMode(7, OUTPUT);
+  // salida filtro -> vca2
+  pinMode (10, OUTPUT);
+  // salida filtro -> vca1
+  //pinMode (11, OUTPUT);
+  Serial.begin(9600);
+  FPSerial.begin(9600);
+  Serial.println();
+  Serial.println(F("DFRobot DFPlayer Mini Demo"));
+  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
+  while (!myDFPlayer.begin(FPSerial, /*isACK = */true, /*doReset = */true)) {  //Use serial to communicate with mp3.
+    Serial.println(F("Unable to begin:"));
+    Serial.println(F("1.Please recheck the connection!"));
+    Serial.println(F("2.Please insert the SD card!"));
+    delay(500);
+  }
+  Serial.println(F("DFPlayer Mini online."));
+  myDFPlayer.volume(20);  //Set volume value. From 0 to 30
+  myDFPlayer.play(4);  //Play the first mp3
+  myDFPlayer.enableLoop();
+  int val = 0;
+  analogWrite(10, val);
+  //analogWrite(11, val);
+}
+void loop() {
+  int difference;
+  //difference = leerSensor(8, A0);
+  difference = leerSensor(7, A1);
+  delay(50);
+  // bajar señal minima del sensor
+  difference = difference -5;
+  //entre 0 y 255, ni mas ni menos
+  if (difference < 0) difference = 0;
+  if (difference > 255) difference = 255;
+  analogWrite(10, difference);
+  //analogWrite(11, difference);
+  Serial.println("0 300 " + String(difference) + " " + myDFPlayer.readVolume());
   if (myDFPlayer.available()) {
@@ Línea 540: / Línea 733: @@
 = Circuitos =
 <gallery>
-LED-LDR-VCA.gif | VCA usando un LDR
+Esquematico-vca.jpg | VCA usando un LDR
 </gallery>

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