Playing mp3 with 2 fingers!

[mathieumoustache]

Hey everyone,

My project is having 2 wired gloves : thumbs are connected to ground and other fingers connected to pins 2, 3, 4, 5, A2, A3, A4, A5.
When a finger touchs thumb, it plays an mp3.

I use arduino uno and DFPlayer Mini.

My code is working when the touch between fingers is short.
When 2 fingers stay in contact a few seconds the song is played another time when fingers separate.
As the state of the pin changes from HIGH to LOW randomly.

Thanks in advance for your help

Here is my code :

SoftwareSerial mySerial(10, 11);
DFRobotDFPlayerMini myDFPlayer;
/*
SD CARD : Folder mp3
01 / 8 samples for 8 fingers (thumbs = ground)
*/

define ACTIVATED LOW

const int button[8] = {2, 3, 4, 5, A2, A3, A4, A5};

bool state[8] = {0, 0, 0, 0, 0, 0, 0, 0};
bool lastState[8] = {0, 0, 0, 0, 0, 0, 0, 0};

void setup ()
{
for ( int i = 0 ; i < 8 ; ++i)
{
pinMode(button[i], INPUT_PULLUP);
digitalWrite(button[i], HIGH);
}

mySerial.begin (9600);

Serial.begin(9600);
Serial.write("Initializing DFPlayer\n");

if (!myDFPlayer.begin(mySerial))
{ //Use softwareSerial to communicate with mp3.
Serial.write("Unable to begin\n");
while (true);
}
Serial.write("DFPlayer Ready\n");
delay(1000);
myDFPlayer.volume(25); //Set volume value (0~30).

//----Set different EQ----
myDFPlayer.EQ(DFPLAYER_EQ_NORMAL);
}

/***********************************
FONCTIONS
***********************************/
void playSong(int folder, int track)
{
delay(100);
myDFPlayer.playFolder(folder, track);
delay(1000);
}

void loop ()
{
for (int i = 0 ; i < 8 ; ++i)
{
state[i] = digitalRead(button[i]);
}

for (int i = 0 ; i < 8 ; ++i)
{
if (state[i] != lastState[i])
{
if (state[i] == ACTIVATED)
{
playSong(1, i);
}
lastState[i] = state[i];
}
}
}

[MarkT]

I think you simply forgot to debounce the switch inputs?

[mathieumoustache]

Hi MarkT,
Thank you so much !
You have the solution.
Now with the delay() function at the right place it works !
Thanks again

my code :

//INFINITE LOOP
void loop ()
{
for (int i = 0 ; i < 8 ; ++i)
{
state[i] = digitalRead(button[i]);
}

for (int i = 0 ; i < 8 ; ++i)
{
if (state[i] != lastState[i])
{
delay(100); //debounce

  if (state[i] == ACTIVATED)
  {
    myDFPlayer.playFolder(1, i);          
  }      
  lastState[i] = state[i];            
}

}
}