Here is my code:
`#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
#include <Encoder.h>
int relayPin = 7; //Relay Control - Lights
const int buttonPin = 2; // the number of the pushbutton pin
Encoder myEnc(3, 4);
int encoderPos = 0;
const int MIN_POSITION = 0;
const int MAX_POSITION = 30;
boolean encoderALast = LOW; //remembers the previous state of the encoder pin A
int buttonState; // the current reading from the input pin
int lastButtonState = LOW; // the previous reading from the input pin
int playing; //Track playing state
int pause; //is track paused?
int fin; //for interrupting audios
unsigned long pauseTime; //Way to track pause length
unsigned long timeUntilReset = 60000; //how long to wait before reset? (60s)
long currentPosition = 0;
long previousPosition = 0;
boolean printed = false;
unsigned long lastDebounceTime = 0; // the last time the output pin was toggled
unsigned long debounceDelay = 50; // the debounce time; increase if the output flickers
// Use pins 2 and 3 to communicate with DFPlayer Mini
static const uint8_t PIN_MP3_TX = 6; // Connects to module's TX
static const uint8_t PIN_MP3_RX = 5; // Connects to module's RX
SoftwareSerial softwareSerial(PIN_MP3_RX, PIN_MP3_TX);
// Create the Player object
DFRobotDFPlayerMini myDFPlayer;
void setup() {
pinMode(relayPin, OUTPUT); // Set RelayPin as an output pin
pinMode(buttonPin, INPUT_PULLUP); // Set buttonPin as Input
softwareSerial.begin(9600); //Serial Port for DFPlayer Mini
if (myDFPlayer.begin(softwareSerial)) // Start communication with DFPlayer Mini
{
Serial.println("OK");
}
else {
Serial.println("Connecting to DFPlayer Mini failed!");
}
Serial.begin(9600);
}
void loop() {
int reading = digitalRead(buttonPin); //Read Button State
if (reading != lastButtonState) {
lastDebounceTime = millis(); // reset the debouncing timer
}
volumeControl();
if (myDFPlayer.available()) {
printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
} //Quick check (is track finished?)
if ((millis() - lastDebounceTime) > debounceDelay) {
// whatever the reading is at, it's been there for longer than the debounce
// delay, so take it as the actual current state:
// if the button state has changed:
if (reading != buttonState) {
buttonState = reading; //Set Buttonstate to current (i.e. 0 or 1)
if (buttonState == HIGH) { //if button pressed, do xyz:
if (playing == 1) { //If track is begun (paused or playing), do xyz:
if (pause == 1) {
myDFPlayer.advertise(3); //Play 'Resume'
delay(1000);
myDFPlayer.start(); // Resume from pause
pause = 2;
}
if (pause == 0) {
fin = 1;
myDFPlayer.stopAdvertise(); //stop advertise to allow 1st track continuation
myDFPlayer.advertise(2); //play 'pause'
delay(1000);
myDFPlayer.pause(); //pause the mp3
pauseTime = millis(); //Reset pause timer
pause = 1;
}
if (pause == 2) {
myDFPlayer.stopAdvertise(); //important so that 'track end' doesnt trigger with end of this track
pause = 0;
fin = 0; //also important, same reason
}
}
if (playing == 0) { //If track not playing, begin playback
myDFPlayer.playMp3Folder(1); // Play the "0001.mp3" in the "mp3" folder on the SD card
digitalWrite(relayPin, HIGH); //Turn Lights on
myDFPlayer.volume(15); // Set volume to maximum (0 to 30).
playing = 1;
}
}
}
}
// save the reading. Next time through the loop, it'll be the lastButtonState:
lastButtonState = reading;
if ((pause == 1) && ((millis() - pauseTime) > timeUntilReset)) { //if its paused, check if pausetime has elapsed resetTime
playing = 0;
pause = 0;
myDFPlayer.pause(); //pause the mp3
digitalWrite(relayPin, LOW); //Turn Lights off
}
}
void volumeControl() {
long currentPosition = myEnc.read() / 4;
// If it goes beyond 30, set it back to 30
if (currentPosition > MAX_POSITION) {
currentPosition = MAX_POSITION;
myEnc.write(currentPosition * 4); // Update the encoder position
}
// If it goes below 0, set it back to 0
if (currentPosition < MIN_POSITION) {
currentPosition = MIN_POSITION;
myEnc.write(currentPosition * 4); // Update the encoder position
}
// Check if the position has changed
if (currentPosition != previousPosition) {
// Print the clamped position
Serial.println(currentPosition);
//Change Volume
myDFPlayer.volume(currentPosition);
// Update the previous position
previousPosition = currentPosition;
printed = true;
} else {
// If it hasn't changed, reset the printed flag
printed = false;
}
}
void printDetail(uint8_t type, int value) { //Controls various things depending on mp3 state
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!"));
if (fin != 1) {
playing = 0;
digitalWrite(relayPin, LOW); //Turn Lights off
myDFPlayer.pause(); //pause the mp3
}
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;
}
}
`
The board is getting 5V and is wired up as 5V to 5V, GND pins to GND, D5 to a 1k ohm resistor to RX, D6 to TX
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