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Introductions
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Twitter @lgleasain
Github lgleasain
www.lancegleason.com
www.polyglotprogrammincinc.com
[email protected]
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http://www.polyglotprogramminginc.com/purr-
programming-2-0/
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Software
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Options
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Pros
•Extensible
•Common Pinouts
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Cons
• Impossible to create a at
scale prototype
• Many extensions overkill for
wearables
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Pros
• Inexpensive
• Available GPS Module
• Low Power
• Aduino Based
• Lots of Support
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Cons
• No easy way to integrate Bluetooth
or Wifi
• Requires a physical connection to
get data
• Things like an accelerometer require
a separate component
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Features
• Bluetooth Support
• Robust API for Android and IOS
• Built in Sensors (temperature,
accelerometer etc.)
• Built in support for rechargeable
batteries
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Specs
• ! Nordic Semiconductor nRF51822 BLE SoC
• ! 2.4 GHz transceiver
• ! ARM®Cortex™-M0 32 bit processor
• ! 256 kB flash program memory
• ! 16 kB RAM
• ! 8/9/10 bit ADC
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Specs Continued
• Accelerometer
• Temperature Sensor
• Push Button Switch
• Bright LED
• Driver for vibration motor
• micro usb chargable
• I2C bus, and support for 4 digital/analog and 4 digital pins
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Cons
• Really Small
• Tough to write custom drivers
• Proprietary
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Bluetooth
• Same Frequency range as
2.4 Gigahertz Wifi
• 79 Channels VS 13
• Less Throughput
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Bluetooth LE
• Always off
• Less Throughput
• Often lower transmit power
• Designed for low data low power
Applications
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IOS
• IPad 3rd Generation or better
• Iphone 4S or greater
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Android
• Bluetooth 4.0 supported radio
• Android 4.3 or greater
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repositories {
ivy {
url "http://ivyrep.mbientlab.com"
layout "gradle"
}
}
compile 'com.mbientlab:metawear:1.5.3'
Include the Repo
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Update The Manifest
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package com.example.metawear;
import com.mbientlab.metawear.api.MetaWearBleService;
import android.app.Activity;
import android.content.ServiceConnection;
public class ExampleActivity extends Activity implements ServiceConnection {
private MetaWearBleService mwService= null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//< Bind the MetaWear service when the activity is created
getApplicationContext().bindService(new Intent(this, MetaWearBleService.class),
this, Context.BIND_AUTO_CREATE);
}
@Override
public void onDestroy() {
super.onDestroy();
//< Unbind the service when the activity is destroyed
getApplicationContext().unbindService(this);
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
//< Get a reference to the MetaWear service from the binder
mwService= ((MetaWearBleService.LocalBinder) service).getService();
}
//< Don't need this callback method but we must implement it
@Override
public void onServiceDisconnected(ComponentName name) { }
}
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public class ExampleActivity extends Activity implements ServiceConnection {
@Override
protected void onResume() {
super.onResume();
registerReceiver(MetaWearBleService.getMetaWearBroadcastReceiver(),
MetaWearBleService.getMetaWearIntentFilter());
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(MetaWearBleService.getMetaWearBroadcastReceiver());
}
}
Nofifications via Activity
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private final string MW_MAC_ADDRESS= "EC:2C:09:81:22:AC";
private MetaWearController mwCtrllr;
public void onServiceConnected(ComponentName name, IBinder service) {
mwService= ((MetaWearBleService.LocalBinder) service).getService();
final BluetoothManager btManager=
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
final mwBoard= btManager.getAdapter().getRemoteDevice(MW_MAC_ADDRESS)
mwCtrllr= mwService.getMetaWearController(mwBoard);
}
//< Connect to the board the object is controlling
mwCtrllr.connect();
///< Close the Bluetooth connection
mwCtrllr.close();
Instantiate and Connect
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private DeviceCallbacks dCallbacks= new DeviceCallbacks() {
@Override
public void connected() {
Log.i("ExampleActivity", "A Bluetooth LE connection has been established!");
}
@Override
public void disconnected() {
Log.i("ExampleActivity", "Lost the Bluetooth LE connection!");
}
};
///< Register the callback, log message will appear when connected
mwController.addDeviceCallback(dCallbacks);
///< Remove the callback, no feedback for when a ble connection is made
mwController.removeDeviceCallback(dCallbacks);
Registering Callbacks
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import com.mbientlab.metawear.api.characteristic;
//< Setup callback for receiving device information
mwCtrllr.addDeviceCallback(new DeviceCallbacks() {
@Override
public void receivedGATTCharacteristic(GATTCharacteristic characteristic,
byte[] data) {
Log.i("ExampleActivity", String.format("%s= %s", characteristic.toString(),
new String(data));
}
@Override
public void receivedRemoteRSSI(int rssi) {
log.i("ExampleActivity", String.format("RSSI= %d dBm", rssi));
}
});
//< Read characteristics from the device information service
//< GATT characteristics are from the DeviceInformation enum
mwCtrllr.readDeviceInfo();
//< Read battery level from the battery service
//< GATT characteristics are from the Battery enum
mwCtrllr.readBatteryLevel();
//< Read RSSI value
mwCtrllr.readRemoteRSSI();
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mwController.addModuleCallback(new MechanicalSwitch.Callbacks() {
@Override
public void pressed() {
if (saviours != null && saviours.getCount() > 0) {
Toast.makeText(getActivity(), "button pressed", Toast.LENGTH_SHORT).show();
sendText(true);
} else {
Toast.makeText(getActivity(), R.string.error_no_contact, Toast.LENGTH_SHORT).show();
}
}
})
Switch Callback
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.addModuleCallback(new Accelerometer.Callbacks() {
@Override
public void shakeDetected(MovementData moveData) {
shakeCounts.getAndIncrement();
if (!setTimerTask.get()) {
resetTask= new TimerTask() {
@Override
public void run() {
shakeCounts.set(0);
setTimerTask.getAndSet(false);
}
};
timer.schedule(resetTask, RESET_DELAY);
setTimerTask.getAndSet(true);
}
if (shakeCounts.get() == MAX_SHAKES) {
resetTask.cancel();
setTimerTask.getAndSet(false);
shakeCounts.getAndSet(0);
if (saviours != null && saviours.getCount() > 0) {
sendText(false);
} else {
Toast.makeText(getActivity(), R.string.error_no_contact, Toast.LENGTH_SHORT).show();
}
}
}
});
Shake Callback
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Example Code Available at
https://github.com/lgleasain/Metawear-Android-SOS
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Twitter @lgleasain
Github lgleasain
www.lancegleason.com
www.polyglotprogrammincinc.com
[email protected]