Jacek Pieczaba
Published © GPL3+

LeapKid

Solution using the DPS130 pressure sensor in a device that can help to protect either infants or toddlers from injuries.

IntermediateFull instructions provided16 hours677
LeapKid

Things used in this project

Hardware components

Infineon Sensor Hub Nano
I am using the Android libraries for DPS310 devices provided by Infineon
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Story

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Schematics

Flow Chart

Flow Chart description how the application is running

Code

Device Finder

Java
Setup and Establish BLE communication between Sensor Hub and Smartphone
package com.example.jacek.leapkid;

import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import android.widget.Button;
import android.widget.TextView;
import android.view.View;
import android.bluetooth.BluetoothDevice;

import java.util.ArrayList;
import java.util.Set;


public class DeviceFinderActivity extends AppCompatActivity {

    private Button btnConnect;
    private TextView tvDevice;
    private String deviceAddress;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.leapkid);

        btnConnect = (Button) findViewById(R.id.btn_connect);
        tvDevice = (TextView) findViewById(R.id.tv_device);

        btnConnect.setOnClickListener(new View.OnClickListener(){

            @Override

            public void onClick(View v) {
                connect();
            }

        });

       Set<BluetoothDevice> allDevices = BluetoothAdapter.getDefaultAdapter().getBondedDevices();

        ArrayList<BluetoothDevice> myDevices = new ArrayList<>();

        for(BluetoothDevice d: allDevices)
        {
            if(isMyDevice(d))
                myDevices.add(d);

        }
        if(myDevices.size()==0){
            Toast.makeText(getApplicationContext(), "No Device found", Toast.LENGTH_LONG).show();
            finish();
        }
    tvDevice.setText("Device:" + myDevices.get(0).getName() + "\t" + myDevices.get(0).getAddress());
        deviceAddress=myDevices.get(0).getAddress();


    }



    private boolean isMyDevice(BluetoothDevice d){
        String deviceName = d.getName().toLowerCase();

        return deviceName.equals("ifx_nanohub");
    }
    void connect(){
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
        intent.putExtra("deviceAddress", deviceAddress);

        startActivity(intent);
    }
}

Main Activity

Java
Main application
package com.example.jacek.leapkid;


import android.media.AudioManager;
import android.media.SoundPool;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


import com.infineon.sen.comm.Model.Mode;
import com.infineon.sen.comm.SensorEvent;
import com.infineon.sen.comm.SensorHub;
import com.infineon.sen.comm.SensorHubListener;


public class MainActivity extends AppCompatActivity {


    private TextView Altitude;
    private Button btnSet;
    private Button btnReset;
    private Button btnOffset;

    ////////////////// Variables ///////////////////////////////////
    private double Alt = 0; // Variable containing Altitude value received from sensor Hub
    private double Alt_offset = 0; // Variable which setup the reference level
    private double Alt_adjust = 0; // Biased value of altitude based on offset value
    private boolean Active = false; // Boolean variable supporting set or reset the alarms.

    private SoundPool mSoundPool;
    private int mSoundID;
    boolean mLoaded = false;
    private int mSoundStreamId;



    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);

        Altitude = (TextView) findViewById(R.id.Altitude);
        btnSet = (Button) findViewById(R.id.btn_Set);
        btnReset = (Button) findViewById(R.id.btn_Reset);
        btnOffset = (Button) findViewById(R.id.btn_Offset);

        ///////////////////Setup a sound control /////////////////////

        this.setVolumeControlStream(AudioManager.STREAM_MUSIC);

        // Load the sound
        mSoundPool = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
        mSoundPool.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
            @Override
            public void onLoadComplete(SoundPool soundPool, int sampleId,
                                       int status) {
                mLoaded = true;
            }
        });

        mSoundID = mSoundPool.load(this, R.raw.alarm, 1);
        //////////////////////////////////////////////////////////////


        String deviceAddress = getIntent().getStringExtra("deviceAddress");

        SensorHub sensorHub = new SensorHub(getApplicationContext(), deviceAddress);

        sensorHub.addSensorHubListener(new SensorHubListener() {
            @Override
            public void onConnected(SensorHub sensorHub) {

                sensorHub.setMode("mode", "bg");
                sensorHub.setMode("prs_mr", "128");
                sensorHub.setMode("prs_osr", "128");
                sensorHub.start();
            }

            @Override
            public void onDisconnected(SensorHub sensorHub) {

                // Toast.makeText(getApplicationContext(),"Disconnect to" + sensorHub.getName(). Toast.LENGTH_LONG.show());

            }

            @Override
            public void onConnectionError(SensorHub sensorHub) {
                //  Toast.makeText(getApplicationContext(),"Connection Error" + sensorHub.getName(). Toast.LENGTH_LONG.show());

            }


            @Override
            public void onModeChanged(SensorHub sensorHub, Mode mode) {

            }

            @Override
            public void onSensorDataReceived(SensorHub sensorHub, final SensorEvent sensorEvent) {


                // measure altitude
                if (sensorEvent.getDataId().equals("a")) {

                    Alt = sensorEvent.getSensorValue();

                    Alt_adjust = (Alt - Alt_offset); // Setup the altitude level with correct offset

                    if (Alt_adjust < 0.15) Alt_adjust = 0; // Ignore changes of the altitude below 15cm

                    if(Active) { // here we activate an alarm if requested conditions happen

                         if (Alt_adjust >= 0.4) alarm_on(); // we will engage the sound alarm if the altitude will reach 40cm or more.
                    }
                    Altitude.setText(Alt_adjust + "m");

                }
            }
        });
        sensorHub.connect();

        btnSet.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) { // Activate watching

              Active = true;

            }

        });

        btnReset.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) { // Deactivate alarms

                Active = false;
                alarm_off();

            }

        });

        btnOffset.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) { // setup the offset for altitude measurements

                Alt_offset = Alt;

            }

        });

}


    private void alarm_on() {

        AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
        float actualVolume = (float) audioManager
                .getStreamVolume(AudioManager.STREAM_MUSIC);
        float maxVolume = (float) audioManager
                .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
        float volume = actualVolume / maxVolume;
        // Is the sound loaded already?
        if (mLoaded) {
            mSoundStreamId = mSoundPool.play(mSoundID, volume, volume, 1, -1, 1f);
        }
        Active = false;
    }  // function responsible for sound alarm activation
    private void alarm_off() {

        mSoundPool.stop(mSoundStreamId);
        Active = false;
    } // function responsible for deactivate the sound alarm

}

Android Manifest

XML
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.jacek.leapkid">

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".DeviceFinderActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity"></activity>
    </application>

</manifest>

LeapKid Layout

XML
First Screen
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/background_light">

    <TextView
        android:id="@+id/tv_device"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="17dp"
        android:text="Device ID:"
        android:layout_above="@+id/btn_connect"
        android:layout_alignParentStart="true"
        android:layout_marginStart="31dp" />

    <Button
        android:id="@+id/btn_connect"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:elevation="0dp"
        android:text="Connect" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/imageView"
        android:layout_centerHorizontal="true"
        android:alpha="1"
        android:text="Watch for Children"
        android:textAppearance="@style/TextAppearance.AppCompat.Body2" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/tv_device"
        android:layout_alignParentStart="true"
        app:srcCompat="@drawable/eye" />
</RelativeLayout>

LeapKid layout

XML
Second Screen
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/background_light">

    <Button
        android:id="@+id/btn_Set"
        style="@style/Widget.AppCompat.Button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:background="@android:color/holo_orange_light"
        android:text="Start Watching" />

    <TextView
        android:id="@+id/Altitude"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_Set"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="168dp"
        android:maxLength="6"
        android:textAppearance="@style/TextAppearance.AppCompat.Display1" />

    <Button
        android:id="@+id/btn_Reset"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:background="@android:color/holo_blue_light"
        android:text="Stop Watching" />

    <Button
        android:id="@+id/btn_Offset"
        style="@style/Widget.AppCompat.Button.Colored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/Altitude"
        android:layout_marginTop="44dp"
        android:background="@android:color/holo_green_dark"
        android:text="SET Reference Level"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true" />

    <TextView
        android:id="@+id/Level"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/btn_Offset"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="48dp"
        android:text=" Level [m]:" />

</RelativeLayout>

Credits

Jacek Pieczaba

Jacek Pieczaba

5 projects • 2 followers
Hardware design engineer;Technology enthusiast;

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