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Setting up your devices

If you want to change your playback / recording device (also because the default setting doesn't work for you), you can do that in the configuration file. If you installed into /opt as recommended, it is /etc/opt/AlexaPi/config.yaml. If you installed elsewhere, the file config.yaml is in your AlexaPi/src directory.

You may need to adjust the volume and/or input gain for the microphone, you can do this with alsamixer. Once the adjustments have been made, you can save the settings using alsactl store.

Checking if your system audio works

1. To test playback, run aplay /usr/share/sounds/alsa/Front_Center.wav
2. To rest recording, run

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#include <iostream>
#include <math.h>
int main(){
  double x=sqrt(12)*(1-(1/(3*pow(3,1)))+(1/(5*pow(3,2)))-(1/(7*pow(3,3)))+(1/(9*pow(3,4)))-(1/(11*pow(3,5)))+(1/(13*pow(3,6)))-(1/(15*pow(3,7)))+(1/(17*pow(3,8))));
  std::cout<<"PI estimation\n";
  std::cout<<"Estimation of PI without precision setting is "<<x<<"\n";
  printf("Estimation PI shown with 12 decimal fraction digit is %.12f\n", x);
  std::cout<<"PI value in cmath library is "<<M_PI<<"\n";
  return 0;
}

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Button button = findViewById(R.id.button);
        
button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        //some stuff
    }
});

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textView.setMovementMethod(new ScrollingMovementMethod());

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Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
startActivity(browserIntent);

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Toast.makeText(getApplicationContext(), "Image downloaded!", Toast.LENGTH_SHORT).show();

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final EditText input = new EditText(MainActivity.this);
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.MATCH_PARENT,
                        LinearLayout.LayoutParams.MATCH_PARENT);
                input.setLayoutParams(lp);
                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("New Playlist")
                        .setPositiveButton("Create", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                            }

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@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will

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<manifest>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    
    <application>
    ...
    </application>
</manifest>

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Having heard about the new camera driver built into the kernel of the new Raspbian OS image, I decided to have a play, using my PS3 EyeToy camera. The steps below are based on this forum thread, with some changes to reflect my own experience. The Raspberry Pi supports a number of cameras, not just the EyeToy, so if you have a spare one lying around, give it a go.

1. Install the ‘motion’package:sudo apt-get install motion

• This should automatically install the required ‘ffmpeg’ package – if not you can just do sudo apt-get install ffmpeg.

2. Edit the config file:sudo nano /etc/motion/motion.conf

• To enable daemon mode (so you can run the software in the background without it tying up your terminal):daemon on