working with sensors internet of things - kursused ... microcontroller and the sensor shield...
TRANSCRIPT
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Working with Sensors
&
Internet of ThingsMobile Application Development 2016/17 Fall
Mohan Liyanage
Satish Srirama
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Mobile sensing• More and more sensors are being incorporated
into today’s smartphones
• These sensors are enabling new applications
across a wide variety of domains, such as
healthcare, social networks, safety,
environment, etc.
Image Source -http://csce.uark.edu/~tingxiny/courses/5013sp14/reading/Lane2010SMP.pdf
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What is a Sensor ?
• A sensor is a physical or virtual object that can
sense events or changes in its environment,
and produce corresponding output
• Most of the times sensor output will be an
electrical/ optical pulse
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Modern android mobile devices come
with a variety of built-in sensors • MIC
• Camera
• Temperature
• Location (GPS or Network)
• Orientation
• Accelerometer
• Proximity
• Pressure
• Light
Note: not every device has all kinds of sensors
Image Source -http://www.bosch-sensortec.com/en4
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The Android platform supports three
broad categories of sensors
• Motion sensors – These sensors measure acceleration forces and
rotational forces along X,Y,Z axes.
– Includes accelerometers, gravity sensors, gyroscopes, and rotational vector sensors.
• Environmental sensors – To measure various environmental parameters
• Ambient air temperature and pressure
• Illumination
• Humidity.
– Includes barometers, photometers, and thermometers, etc.
http://developer.android.com/guide/topics/sensors/sensors_overview.html#sensors-intro5
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Categories of sensors – continued
• Position sensors
– Measure the physical position of a device
– Includes orientation sensors and magnetometers
Note: Some of these sensors are always hardware-
based (accelerometer, gyroscope, temperature ,
light, magnetometer) and some of these sensors
(gravity, linear acceleration, rotation vector )can be
either hardware-based or software-based (virtual).
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Motion Sensors• Accelerometer
– Measures the acceleration force on
all three physical axes (X,Y,Z)
– Useful for monitoring device movement
like tilt, shake, rotation, or swingImage Source -http://tectrick.org/wp-
content/uploads/2014/10/What-is-an-
Accelerometer-sensor.png
Zompopo: Mobile Calendar Prediction Based on Human Activities Recognition Using the Accelerometer and Cloud
Services:Srirama, Satish Narayana, Huber Flores, and Carlos Paniagua. NGMAST IEEE, 2011 7
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• Gyroscope
– Measures a device's rate of rotation (angular
velocity)
– When the device is not rotating, the sensor values
will be zero
Image Source -http://www.embedds.com/connecting-gy521-gyroscope-
module-to-arduino/
Motion Sensors…
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• Magnetic Field
– Monitor changes in the earth's magnetic field on
X,Y,Z axes
– With the orientation sensor, you can determine
the position of a device
Image Source - http://gadgetstouse.com/gadget-tech/magnetic-feiled-sensor-necessity-navigation-
android-devices/10620
Position Sensors
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Environmental Sensors
• Android provides four hardware-based
sensors to monitor
– Relative ambient humidity
– Illuminance
– Ambient pressure
– Ambient temperature
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• Proximity sensor
– Most proximity sensors are simply light sensors(IR)
that will detect "proximity“
– Reduce display power consumption by turning off
the LCD backlight
– Disable the touch screen to avoid accidental touch
events (the ear contact with the screen and
generating touch events while on a call)
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Sensor Framework
• You can access the raw sensor data by accessing the
Android sensor framework
• Android’s sensors are controlled by external services
• The framework has provided call back to obtain
sensor dataApp SensorManager
Register Callback
Sensor Event
Sensor Event
SensorEventListener call back 12
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Sensor Framework…• The Android sensor framework contains the following classes and
interfaces– SensorManager
• This class provides various methods for – Accessing and listing sensors
– Registering and unregistering sensor event listeners
SensorManager mSensorManager;
mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
• ServiceManager provides access to Sensor Manager Service
– Sensor• A class representing a sensor
• Uses to create an instance of a specific sensor
Sensor mAccelerometer;
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
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– SensorEvent• The system uses this class to create a sensor event object,
which holds information such as the sensor's type, raw sensor data, of a of a sensory event
– SensorEventListener• Provides two callback methods that receive notifications
(sensor events)
• When sensor accuracy change
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// Do something here if sensor accuracy changes
}
• When sensor values changepublic void onSensorChanged(SensorEvent event) {
// Many sensors return 3 values, one for each axis.
float value1 = event.values[0];
…………….
// Do something with this sensor value.
}
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• Important : Make sure to disable any sensor when you don’t use or when the sensor activity pauses
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
– The system will not disable sensors when the screen turns off.
– That leads to the battery will drain in a few hours
• You can register sensor listener when the activity resumed
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
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Practice Identify which sensors are on the device
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Reading accelerometer data
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@Override
public final void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y= event.values[1];
float z = event.values[2];
tv1.setText( "X : " +x+" Y : "+y+" Z : "+z);
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAcc,
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
}
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Working with the sensor simulator • Download the following files
https://www.dropbox.com/s/1g2udpvoiu2c0bc/S
ensorSimulatorSettings-2.0-rc1.apk?dl=0
https://www.dropbox.com/s/5vpjfrw8vmsq4p8/s
ensorsimulator-2.0-rc1.jar?dl=0
• Execute sensor simulator
– $ java –jar sensorsimulator-2.0-rc1.jar
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Communicate with the AVD• Install app in AVD
– adb install SensorSimulatorSettings-2.0-rc1.apk
(adb command in /android-sdk/platform-tools/)
– Set IP address in AVD
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Practice
• Orientation indicator that displays the device
orientation as Left , Middle and Right
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Mobile Sensing and Internet of Things
http://iotworldnews.com/2014/10/qualcomm-snaps-up-bluetooth-pioneer-csr-to-capitalise-on-iot/23
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Internet of Things (IoT)
• International Telecommunication Union
defined IoT as
“A global infrastructure for the information
society enabling advanced services by
interconnecting (physical and virtual) things
based on existing and evolving, interoperable
information and communication technologies
”(ITU Internet report-2005)
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• European Research Cluster on the Internet of
Things defined IoT as:
“The Internet of Things allows people and
things to be connected Anytime, Anyplace, with
Anything and Anyone, ideally using Any
path/network and Any service.”
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• A thing,
– Can be a person with a heart monitor implant
– A farm animal with a biochip transponder
– An automobile that has built-in sensors
– Other natural or man-made objects
With unique identifier and the ability to
communicate over the internet without requiring
human interaction.
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Why it is so important ?
• More connected devices than people
• Cisco believes the market size will be$19 trillion by 2025
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Environment Protection• Great Barrier Reef in Australia
• Buoys equipped with sensors collect
biological, physical, and chemical data to
minimize and prevent reef damage
Source : Kip Compton, VP Internet of Things (IoT) Systems and Software Group The Internet of Things: What Does it Take to Make the Internet of Everything
Real? 28
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Smart Home Scenario
Sensing as a Service Model for Smart Cities Supported by Internet of Things”, Charith Perera1, Arkady Zaslavsky, Peter Christen,
Dimitrios Georgakopoulos, TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES Trans. Emerging Tel. Tech. 2014
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Smart Healthcare
• Medication in The United States
• Smart pill bottles remind patients to take their medication and records that the patient has taken the correct dosage
Source : Kip Compton, VP Internet of Things (IoT) Systems and Software Group The Internet of Things: What Does it Take to Make the Internet of Everything
Real? 30
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Smart health
Dr. M, project KAIST31
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Smart Agriculture• Red Tecnoparque Colombia has deployed a wireless sensors
network technology to monitor plantain crops in Lembo area, in Santa Rosa de Cabal region.
• Plantain crops has been monitored with different sensors as:– Digital Humidity & Temperature
– Soil moisture
– Soil temperature
– Trunk diameter
– Fruit diameter
– Pluviometer
– Solar radiation
• Some of the benefits :– Improving environmental and
agricultural sustainability.
– Organic waste management
– Crops traceability etc
Source : http://www.libelium.com/improving-banana-crops-production-and-agricultural-sustainability-in-colombia-using-sensor-networks/32
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Where Mobiles can Fit?
• Most of the times IOT sensors do not have a
sufficient amount of energy and processing
power to connect directly to the internet
through Wi-Fi or mobile networks
• Especially when the sensors deploy sparsely, a
mobile device can work as a sink/relay to
collect the sensor data and upload them to
the backend servers
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Mobile Sensing with Non-integrated
sensors• Mobile phones can collect data from external
sensors and upload them to the backend
servers or provide data directly to the end
users(Mobile Host)
• ZebraNet, BikeNet , urban sensing, etc.
http://www.cs.ubc.ca/~krasic/cpsc538a/summaries/29/ZebraNet.htm
http://sensorlab.cs.dartmouth.edu/news.html34
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Arduino Sensor kit• Basic prototype board with the Arduino Mega
ADK microcontroller and the sensor shield
Microcontroller
Sensor shield 35
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Demo-1
Reading ambient temperature
Setup
• Mega ADK microcontroller
• Bluetooth module and temperature sensor
• App to communicate with the Arduino
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Bluetooth low energy(BLE) shield
Mega ADK microcontroller
& sensor shield
Android APP
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How does it work?
– Temperature sensor generates an analog signal
according to the temperature variance
– Microcontroller do the A/D conversion and
forward data to the Bluetooth module
Arduino code
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• Bluetooth module transmits data to the Android
device over the established connection
• The Android app reads data over the established BLE
connection, processed and present to the end user
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Demo-2• Arduino Home Automation
– Running a small web server on the Arduino board
which provides controlling home appliances
through the Web interface
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Homework 4
• Develop an Android application using Google Maps API
• You need to draw the path on the map from your residence to your current location (for example, institute of computer science -J Liivi 2). You should mark the start location(your residence ) using red marker { } with the hard corded map coordinates.
• Refer this link for more information https://developers.google.com/maps/documentation/android/start
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Sample output
Submission deadline is 13 October 2016
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Start point
(hard coded)
End point
(device GPS)
Dynamic path
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Home Assignment 2
• An object moves from left to right (and vice-
versa) based on the orientation of the device
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• A touch event makes the object to jump over an obstacle
• Submission deadline is 20th October 2016
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References/Suggested readings
• J. Mass, C. Chang, S. N. Srirama: Workflow Model Distribution or Code Distribution? Ideal Approach for Service Composition of the Internet of Things, 13th IEEE International Conference on Services Computing (SCC 2016), June 27- July 2, 2016, pp. 649-656. IEEE.
• C. Chang, S. N. Srirama, M. Liyanage: A Service-Oriented Mobile Cloud Middleware Framework for Provisioning Mobile Sensing as a Service, The 21st IEEE International Conference on Parallel and Distributed Systems (ICPADS 2015), December 14-17, 2015, pp. 124-131. IEEE.
• C. Chang, S. N. Srirama, J. Mass: A Middleware for Discovering Proximity-based Service-Oriented Industrial Internet of Things, 12th IEEE International Conference on Services Computing (SCC 2015), June 27 - July 2, 2015, pp. 130-137. IEEE.
• C. Chang, S. Loke, H. Dong, F. Salim, S. N. Srirama, M. Liyanage, S. Ling: An Energy-Efficient Inter-organizational Wireless Sensor Data Collection Framework, The IEEE 22nd International Conference on Web Services (ICWS 2015), June 27 - July 2, 2015, pp. 639-646. IEEE.
• B. Zhou, A. Dastjerdi, R. Calheiros, S. N. Srirama, R. Buyya: A Context Sensitive Offloading Scheme for Mobile Cloud Computing Service, 8th IEEE International Conference on Cloud Computing (CLOUD 2015), June 27 - July 2, 2015, pp. 869-876. IEEE.
• M. Liyanage, C. Chang, S. N. Srirama: Lightweight Mobile Web Service Provisioning for Sensor Mediation, 4th International Conference on Mobile Services (MS 2015), June 27 - July 2, 2015, pp. 57-64. IEEE. (Won Best Paper Award)
• S. N. Srirama, A. Ostovar: Optimal Resource Provisioning for Scaling Enterprise Applications on the Cloud, The 6th IEEE International Conference on Cloud Computing Technology and Science (CloudCom-2014), December 15-18, 2014, pp. 262-271. IEEE.
• C. Chang, S. N. Srirama, S. Ling: SPiCa: A Social Private Cloud Computing Application Framework, The 13th International Conference on Mobile and Ubiquitous Multimedia (MUM 2014), November 25-28, 2014, pp. 30-39. ACM.
• J. Mass, S. N. Srirama, H. Flores, C. Chang: Proximal and Social-aware Device-to-Device Communication via Audio Detection on Cloud, The 13th International Conference on Mobile and Ubiquitous Multimedia (MUM 2014), November 25-28, 2014, pp. 143-150. ACM.
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