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LiveInternet.ru:
: 17.03.2011
:
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: 51

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Android Things Raspberry Pi3

, 29 2017 . 10:02 +

2016 Google Developer Preview Android Things. . preview-, .


IoT , . Live Typing . , Android Things, . , .



1: . , , . , . , , .


2: . . , , , . - .


, , , - , . , . . .


. ( , ). , . Awesome, ?


. ? ? ? ? . Doorbell Android Things. , , , . .



. Raspberry, , , . c Android Things CodeLab IT- , , Mobilatorium. , Google Cloud Vision FindFace Tensor Flow. , back-end, , . , Google Cloud Vision + Firebase Realtime Database, CodeLab.


, Raspberry Pi3, , - . , [ ] (https://vk.com/mobilatorium?w=wall-130802553_81%2Fall) Arduino. .



:


  • Raspberry Pi 3 1;
  • MicroSD 8Gb 1;
  • NoIR Camera V2 1;
  • Breadboard 1;
  • Infrared PIR Motion Sensor Module 1;
  • SG90 Servo Motor 1;
  • Photoresistor (Light Sensor) 1;
  • Push Button 1;
  • LED 3 ;
  • Resistors (1k) 3;
  • Resistors (10k) 1 ;
  • Pin Jumper Wires ;
  • 1.

, . , 100-125$. Raspberry Pi3.



. , . , Android, , . Android Studio. , Dagger, RxJava, Retrofit, OkHttp, Timber ..


Android Things, Raspberry Pi3. .


Raspberry Pi . GPIO (General-purpose input/output) PWM (Pulse Width Modulation). .


, . , , . . , . , Google User Drivers, Android Framework Services. Android API . :


  • ;
  • ;
  • ;
  • ;
    .

1: Android Things


Android Things Raspberry Pi3. .


, , , Raspberry - HDMI-. , Android Things.


img


WiFi. Android Things IP- WiFi .


img


, , Raspberry adb .


$ adb connect Android.local

2:


Android Studio. Android , , . Android Things , .


:


  • Android Studio 2.2 ;
  • SDK Tools 25.0.3 ;
  • Min SDK 24 ;
  • Target SDK 24 .

app/build.gradle Android Things support library, API, Android SDK.


dependencies {
    ...
    provided 'com.google.android.things:androidthings:0.4-devpreview'
    ...
}

Android, ( , Activity, Service, Intent, View, Button, Application, ContentProvider ).
. , , . . 



    ...
    
    ...

Android Things , . Activity, IOT_LAUCHER AndroidManifest , Activity - . Android Studio .



    ...
    
    
        
        
    

    
    
        
        
        
    
    ...

3:


, . : . . , . . .


raspberry_step#1


1 . , . . Raspberry, .


, . 


dependencies {
    ...
    compile 'com.google.android.things.contrib:driver-button:0.3'
    ...
}

- . , , .


ButtonWrapper.java
import com.google.android.things.contrib.driver.button.Button;

public class ButtonWrapper {

   private @Nullable Button mButton;

   private @Nullable OnButtonClickListener mOnButtonClickListener;

   public ButtonWrapper(final String gpioPin) {
       try {
           mButton = new Button(gpioPin, Button.LogicState.PRESSED_WHEN_HIGH); 
           mButton.setOnButtonEventListener(new Button.OnButtonEventListener() {
               @Override
               public void onButtonEvent(Button button, boolean pressed) {
                   if (pressed && mOnButtonClickListener != null) {
                      mOnButtonClickListener.onClick();
                   }
               }
           });

       } catch (IOException e) {
           e.printStackTrace();
       }
   }

   public void setOnButtonClickListener(@Nullable final OnButtonClickListener listener) {
       mOnButtonClickListener = listener;
   }

   public void onDestroy() {
       if (mButton == null) {
           return;
       }
       try {
           mButton.close();
       } catch (IOException e) {
           e.printStackTrace();
       } finally {
           mButton = null;
       }
   }

   public interface OnButtonClickListener {
       public void onClick();
   }
}

Activity. GPIO ("BCM4") Raspberry Pi3, .


MainActivity.java
public class MainActivity extends Activity {

    private static final String GPIO_PIN_BUTTON = "BCM4";

    private ButtonWrapper mButtonWrapper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        mButtonWrapper = new ButtonWrapper(GPIO_PIN_BUTTON);
        mButtonWrapper.setOnButtonClickListener(new ButtonWrapper.OnButtonClickListener() {
            @Override
            public void onClick() {
                Timber.d("BUTTON WAS CLICKED");
                startTakingImage();
            }
        });
        ...
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ...
        mButtonWrapper.onDestroy();
        ...
    }

    private void startTakingImage() {
        // TODO take photo
        ...
    }
}

4:


NoIR Camera V2. 45$ , :


  • : 8 (3280x2464);
  • : 1080p (30fps), 720p (60fps), 640x480p (90fps);
  • : 250

CSI (Camera Serial Interface). USB.


, . , Permissions, Dangerous Permissions, ( , ).

. , . . 480320.


5:


, , . . , , , .


:


  • (BCM20) , ;
  • (BCM21) ;
  • (BCM16)

. , . 1 , .


raspberry_step#2


PeripheralManagerService, , GPIO . . , com.google.android.things.pio.Gpio, , java.io.IOException. try-catch .


LedWrapper.java
public class LedWrapper {

    private @Nullable Gpio mGpio;

    public LedWrapper(String gpioPin) {
        try {
            PeripheralManagerService service = new PeripheralManagerService();
            mGpio = service.openGpio(gpioPin);
            mGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void turnOn() {
        if (mGpio == null) {
            return;
        }
        try {
            mGpio.setValue(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void turnOff() {
        if (mGpio == null) {
            return;
        }
        try {
            mGpio.setValue(false);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void onDestroy() {
        try {
            mGpio.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            mGpio = null;
        }
    }
}

Activity .


MainActivity.java
public class MainActivity extends Activity {

    private final static String GPIO_PIN_LED_GREEN = BCM21;
    private LedWrapper mLedWrapper;

    @Override   
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        mLedWrapper = new LedWrapper(GPIO_PIN_LED_GREEN);      
        mLedWrapper.turnOff();
        ...
    }

    private void turnOn() {
        mLedWrapper.turnOn();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ...
        mLedWrapper.onDestroy();
        ...
    }
}

6:


, , . , . . . .


BCM6 , .


img_motion


MotionWrapper.java
public class MotionWrapper {

    private @Nullable Gpio mGpio;
    private @Nullable MotionEventListener mMotionEventListener;

    public MotionWrapper(String gpioPin) {
        try {
            mGpio = new PeripheralManagerService().openGpio(gpioPin);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void setMotionEventListener(@Nullable final MotionEventListener listener) {
        mMotionEventListener = listener;
    }

    public void startup() {
        try {
            mGpio.setDirection(Gpio.DIRECTION_IN);
            mGpio.setActiveType(Gpio.ACTIVE_HIGH);
            mGpio.setEdgeTriggerType(Gpio.EDGE_RISING);
            mGpio.registerGpioCallback(mCallback);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void shutdown() {
        if (mGpio == null) {
            return;
        }
        try {
            mGpio.unregisterGpioCallback(mCallback);
            mGpio.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void onDestroy() {
        try {
            mGpio.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            mGpio = null;
        }
    }

    private final GpioCallback mCallback = new GpioCallback() {
        @Override
        public boolean onGpioEdge(Gpio gpio) {
            if (mMotionEventListener != null) {
                mMotionEventListener.onMovement();
            }
            return true;
        }
    };

    public interface MotionEventListener {
        void onMovement();
    }
}

MainActivity.java

public class MainActivity extends Activity {


private static final String GPIO_PIN_MOTION_SENSOR = "BCM6";

private MotionWrapper mMotionWrapper;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    mMotionWrapper = new MotionWrapper(GPIO_PIN_MOTION_SENSOR);
    mMotionWrapper.setMotionEventListener(new MotionWrapper.MotionEventListener() {
        @Override
        public void onMovement() {
            startTakingPhotos();
        }
    });
    mMotionWrapper.startup();
    ...

}


@Override
protected void onDestroy() {
    super.onDestroy();
    ...
    mMotionWrapper.shutdown();
    mMotionWrapper.onDestroy();
    ...
 }

private void startTakingPhotos() {
    ...
}

}


7:


. 180 . .


, . app/build.gradle . 


dependencies {
    ...
    compile 'com.google.android.things.contrib:driver-pwmservo:0.2'
    ...
}

- PWM1 . PWM , , , , . . - PWM-, .


img_servo


ServoWrapper.java
public class ServoWrapper {

    private static final float ANGLE_CLOSE = 0f;
    private static final float ANGLE_OPEN = 180f;

    private Servo mServo;
    private Handler mHandler = new Handler();

    public ServoWrapper(final String gpioPin) {
        try {
            mServo = new Servo(gpioPin);
            mServo.setAngleRange(ANGLE_CLOSE, ANGLE_OPEN);
            mServo.setEnabled(true);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void open(final long delayMillis) {
        try {
            mServo.setAngle(ANGLE_OPEN);
        } catch (IOException e) {
            e.printStackTrace();
        }

        mHandler.removeCallbacks(mMoveServoRunnable);
        if (delayMillis > 0) {
            mHandler.postDelayed(mMoveServoRunnable, delayMillis);
        }
    }

    public void close() {
        if (mServo == null) {
            return;
        }

        try {
            mServo.setAngle(ANGLE_CLOSE);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void onDestroy() {
        mHandler.removeCallbacks(mMoveServoRunnable);
        mMoveServoRunnable = null;

        if (mServo != null) {
            try {
                mServo.close();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                mServo = null;
            }
        }
    }

    private Runnable mMoveServoRunnable = new Runnable() {
        @Override
        public void run() {
            mHandler.removeCallbacks(this);
            close();
        }
    };
}

MainActivity.java

public class MainActivity extends Activity {


private static final String GPIO_PIN_SERVO = "PWM1";

private ServoWrapper mServoWrapper;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    mServoWrapper = new ServoWrapper(GPIO_PIN_SERVO);
    ...

}


private void openDoor() {
    ...
    mServoWrapper.open(DELAY_SERVO_MS);
    ...
}

@Override
protected void onDestroy() {
    super.onDestroy();
    ...
    mServoWrapper.onDestroy();
    ...
 }

}


8:


, . , . Light Dependent Resistors (LDR). .


, . , . app/build.gradle .


dependencies {
    ...
    compile 'com.google.android.things.contrib:driver-button:0.3'
    ...
}

. 10 . BCM25.


doorbell_full_scheme_version


, .


BrightrWrapper.java
public class BrightrWrapper {

    private @Nullable Button mLightDetector;

    private @Nullable OnLightStateChangeListener mOnLightStateChangeListener;

    public BrightrWrapper(final String gpioPin) {
        try {
            mLightDetector = new Button(gpioPin, Button.LogicState.PRESSED_WHEN_HIGH);
            mLightDetector.setOnButtonEventListener(new Button.OnButtonEventListener() {
                @Override
                public void onButtonEvent(Button button, boolean isLighted) {
                    if (mOnLightStateChangeListener != null) {
                        mOnLightStateChangeListener.onLightStateChange(isLighted);
                    }
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void setOnLightStateListener(@Nullable final OnLightStateChangeListener listener) {
        mOnLightStateChangeListener = listener;
    }

    public void onDestroy() {
        if (mLightDetector == null) {
            return;
        }
        try {
            mLightDetector.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public interface OnLightStateChangeListener {
        public void onLightStateChange(boolean isLighted);
    }
}

MainActivity.java
public class MainActivity extends Activity {

    private static final String GPIO_PIN_LIGHT_DETECTOR = "BCM25";

    private BrightrWrapper mBrightrWrapper;

    private boolean mIsTakePhotoAllowed = true;

    @Override   
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        mBrightrWrapper = new BrightrWrapper(GPIO_PIN_LIGHT_DETECTOR);
        mBrightrWrapper.setOnLightStateListener(new BrightrWrapper.OnLightStateChangeListener() {
            @Override
            public void onLightStateChange(final boolean isLighted) {
                mIsTakePhotoAllowed = isLighted;
                handleLightState();
            }
        });
        ...
    }

    private void handleLightState() {
        if (mIsTakePhotoAllowed) {
            ...
        } else {
            ...
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ...
        mBrightrWrapper.onDestroy();
        ...
    }
}


, - .


img


-






. , . .
, , . .
. , , , .
.



Github.


, , , . , . , . , . , . , .


IoT ? .


, BrailleBox Android Things. , . , .



Original source: habrahabr.ru (comments, light).

https://habrahabr.ru/post/331888/

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