[SOLVED] Plugin to play a song when button is pressed (door bell)

[soko]

soko

29. Juli 2015 at 13:57 #15233

Hi,

I’d like to implement a special door bell for our house which plays a specific MP3 (saved on SD card) when the door bell is pressed.
I have experience with Arduino and I’m a software developer.

The HiFiBerry Amp+ is exactly what I was looking for hardware wise. And the combination with Max2Play looks very promising.

All I need to do know is to read an input pin on the Raspberry and start a song on Max2Play if the button is pressed.
I had a look at your plugin developing video but it seems more like a webinterface tool than what I’d like to do.

In a nutshell: Can you tell me if such a plugin/addition can be (easily) added to Max2Play?
The very cool solution would be if I can change/choose the song via webinterface… which should be possible with the plugin developing as far as I can tell.

thanks
Soko

• This topic was modified 9 years, 3 months ago by soko.
• This topic was modified 7 years, 10 months ago by Christoph.

[flysurfer Moderator]

flysurfer Moderator

30. Juli 2015 at 15:23 #15240

Hi Soko,

it is possible to connect your doorbell to some audiooutput with Max2Play. You basically need to write your own bash-script to play a MP3. Following things are needed:

1. WiringPI library and a small script written in C that compiles on the PI to capture the event of the GPIO-PIN. This script should execute a Shell Script.

This is an example of a C-Script, that captures a button event on the PI:

//build with gcc -I. -o button button.c -lwiringPi
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <wiringPi.h>

typedef enum { false, true } bool;
static bool globalActive = false;
static int globalCounter = 0;

void myInterrupt(void) {
  int pin = digitalRead(2);
  if(pin == LOW && globalActive == false){
    globalActive = true;
    printf ("Button pressed\n");
  }else if(pin == HIGH && globalActive == true){
    printf ("Button Released\n");    
    int sysreturn = 0;    
    sysreturn = system("/opt/max2play/scriptyouwant.sh");    
    printf("System: %d", sysreturn);
    globalActive = false;
  }
}

int main (void)
{
  wiringPiSetup () ;

  wiringPiISR (2, INT_EDGE_BOTH, &myInterrupt) ;

  for (;;) {
    sleep(1000);
  }
  return 0 ;
}

2. Shell-Script, that plays a MP3 with either mpc (command line MPD-Tool) or tells the squeezeboxserver (may be on another device in your network) via http-Get request to play a mp3 on one of your audioplayers (or on all). If you go big, use a squeezebox server and make use the command-line arguments like this in your Shell-Script (you may find the documentation for this command line interface in the squeezebox server interface after installation):

# Example CLI-Call to Play current song via http-GET Request to Squeezebox Server on Max2Play 
wget -q -O - "http://max2play:9000/status.html?p0=play&p1=preset_1.single&player=[MAC-Address URL-encoded]"

Cheers,
Stefan

[soko]

soko

30. Juli 2015 at 15:33 #15241

sweeet as!
thx man for the source, i got the idea.
it may take a while until im able to try it but i will report back for sure.
thx
Soko