Problem implementing skip() functionality on buttons.

[briandafydd]

Hi everyone/Phil,

I am an amateur engineer trying to make a bluetooth based speaker system. The code so far has been brilliant, however I am seriously struggling to implement basic button controls over the audio source.

My code is a combination of this fine library with the Easybutton library. The buttons are nice and they debounce, but I have no idea how to make the play/pause, next, back and volume work when the buttons press.

My code is as follows (only the skip function is implemented on button 2; more buttons will be added for the extra functions):

#include <EasyButton.h>

// ESP32 pins where the buttons are connected to
#define BUTTON_ONE_PIN 35
#define BUTTON_TWO_PIN 33

#define BAUDRATE 115200

#include "ESP_I2S.h"
#include "BluetoothA2DPSink.h"

const uint8_t I2S_SCK = 14; /* Audio data bit clock - Connect to PCM102 BCK*/
const uint8_t I2S_WS = 15; /* Audio data left and right clock - Connect to PCM102 LCK*/
const uint8_t I2S_SDOUT = 22; /* ESP32 audio data output (to speakers) - Connect to PCM5102 DataIn*/
I2SClass i2s;

BluetoothA2DPSink a2dp_sink(i2s);

// Button1
EasyButton button1(BUTTON_ONE_PIN);
// Button2
EasyButton button2(BUTTON_TWO_PIN);

// Callback function to be called when button1 is pressed
void onButton1Pressed()
{
Serial.println("Button1 pressed");

}

// Callback function to be called when button2 is pressed
void onButton2Pressed()
{
Serial.println("Button2 pressed");
//next();
}

void setup()
{
i2s.setPins(I2S_SCK, I2S_WS, I2S_SDOUT);
if (!i2s.begin(I2S_MODE_STD, 44100, I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO, I2S_STD_SLOT_BOTH))
{
Serial.println("Failed to initialize I2S!");
while (1); // do nothing
}

a2dp_sink.start("My_Music");

// Initialize Serial for debuging purposes
Serial.begin(BAUDRATE);

Serial.println();
Serial.println(">>> EasyButton multiple buttons example <<<");

// Initialize the button1
button1.begin();
// Initialize the button2
button2.begin();
// Add the callback function to be called when the button1 is pressed.
button1.onPressed(onButton1Pressed);
// Add the callback function to be called when the button2 is pressed.
button2.onPressed(onButton2Pressed);
}

void loop()
{
// Continuously read the status of the buttons
button1.read();
button2.read();
}

ERROR CODE is as follows:

exit status 1

Compilation error: 'next' was not declared in this scope

Sorry if this is something obvious that I should be able to find in the readme but I can't find it. Best wishes.

[pschatzmann]

Have a look at the class documentation: you need to call the methods on the instance: a2dp_sink.next()

[briandafydd]

Phil, I loves ya.