Internet of Things workshop for kids. Shows how you can use Java on Raspberry Pi and Lego Mindstorms with some fun projects that are easy to program.

1. Oracle IoT Kids Workshop
Stephen Chin
Java Technology Ambassador
JavaOne Content Chair
@steveonjava

2. What Runs Java?

3. What Runs Java?

4. Java and 3G in a Tiny Package
> Cinterion EHS5

5. Really Tiny…
27.6mm
18.8mm

6. http://upload.wikimedia.org/wikipedia/commons/3/3d/Cloud_forest_Ecuador.jpg

7. =
Have Java With Your Dessert
Raspberry Pi

8. Pis are Affordable
$35

9. Pis are Affordable
$35 1 Box of Diapers
Bicycle
(but just 1 wheel)
A Cake

10. Chalkboard Electronics Touchscreen
 10" or 7" Form Factor
 Connects via HDMI/USB
 Tested with JavaFX 8
 10% Exclusive Discount:
G1F0U796Z083

11. How to Setup Your Pi
> Step 1: Install Linux
> Step 2: Download/Copy Java 8 for ARM
> Step 3: Deploy and Run JVM Language Apps
http://steveonjava.com/
javafx-on-raspberry-pi-3-easy-steps/

12. Electronic Safety!
> Unplug from wall before wiring
> Get rid of static by touching a metal
surface
> Don't touch exposed wires/metal
> Never remove/insert SD Card while
power is on
12

13. What Comes in Your Lab Kit
1. Touch Screen
2. SD Card
3. Keyboard
4. Yellow Box:
 Power Adapter
 LVDS Cable/Board
 Raspberry Pi Model B
 Mini-USB Cable (power)
Please Save All the Packaging for Later

14. Hooking Up the Pi (Part A)
1. Insert the SD Card in to the Pi
 Will appear upside down when looking at the top
of your Pi
2. Insert the HDMI board into the Pi's HDMI
jack
3. Connect the Pi power to the HDMI board
 Use the Micro USB Cable (short one)
14
Important: Connect everything before plugging into the wall

15. Hooking Up the Pi (Part B)
4. Slide the LCD cable into the back of the display
 Side with gold connectors goes up
 Be careful, the connector is fragile!
5. Hook up the USB keyboard
6. Connect the USB end to one of the Pi's USB host ports
 This provides touch input
15
Verify connections and plug into power now

16. Is it Working?
> Should get a bunch of flashing LEDs to indicate booting
 Boot takes approx 30 seconds
> The LCD screen should light up
 Might be dim if the light sensor is obstructed
> And you will should see a Linux boot screen with lots of text

17. Logging In
At the login prompt type your username:
> pi
And enter the password:
> raspberry

18. Running the JavaFX Sample Application
Change directory to the project folder
> cd MaryHadALittleLambda
Run the build script
> ant

19. 19

20. Hacking the Code
Run the nano text editor:
> nano src/sample/MapObject.java
Save your changes:
> Control-O Enter
Exit Nano:
> Control-X
Compile/Run:
> ant

21. Mary Had a Little Lambda
Mary had a little lambda
Whose fleece was white as snow
And everywhere that Mary went
Lambda was sure to go!
https://github.com/steveonjava/MaryHadALittleLambda

22. Generating Streams
From a collection:
> anyCollection.stream();
Known set of objects:
> Stream.of("bananas", "oranges", "apples");
Numeric range:
> IntStream.range(0, 50)
Iteratively:
> Stream.iterate(Color.RED,
> c -> Color.hsb(c.getHue() + .1, c.getSaturation(),
> c.getBrightness()));
22

23. Let's Create Some Barn Animals!
SpriteView tail = s.getAnimals().isEmpty() ?
s : s.getAnimals().get(s.getAnimals().size() - 1);
Stream.iterate(tail, SpriteView.Lamb::new)
.skip(1).limit(7)
.forEach(s.getAnimals()::add);
23

24. 24

25. Filtering Streams
Predicate Expression
> public interface Predicate<T> {
> public boolean test(T t);
> }
Filter out minors
> adults = attendees.filter(a -> a.getAge() >= 1.8)
25

26. Rainbow-colored Lambs!
s.getAnimals().stream()
.filter(a -> a.getNumber() % 4 == 2)
.forEach(a -> a.setColor(Color.YELLOW));
s.getAnimals().stream()
.filter(a -> a.getNumber() % 4 == 3)
.forEach(a -> a.setColor(Color.CYAN));
s.getAnimals().stream()
.filter(a -> a.getNumber() % 4 == 0)
.forEach(a -> a.setColor(Color.GREEN));
26

27. 27

28. Filtering Collections
Collection.removeIf
> Removes all elements that match the predicate
List.replaceAll
> In-place filtering and replacement using an unary operator
ObservableCollection.filtered
> Returns a list filtered by a predicate this is also Observable
28

29. Picky Eaters…
Predicate<SpriteView> pure =
a -> a.getColor() == null;
mealsServed.set(mealsServed.get() +
s.getAnimals().filtered(pure).size()
);
s.getAnimals().removeIf(pure);
29

30. 30

31. Mapping Streams
Applies a Map Function to each element:
> Function<? super T, ? extends R>
Result: List is the same size, but may be a different type.
31

32. Single Map
s.getAnimals().setAll(s.getAnimals()
.stream()
.map(sv -> new Eggs(sv.getFollowing())
.collect(Collectors.toList())
);
32

33. Or a Double Map!
s.getAnimals().setAll(s.getAnimals()
.stream()
.map(SpriteView::getFollowing)
.map(Eggs::new)
.collect(Collectors.toList())
);
33

34. 34

35. Flat Map
Applies a One-to-Many Map Function to each element:
> Function<? super T, ? extends Stream<? extends R>>
And then flattens the result into a single stream.
Result: The list may get longer and the type may be different.
35

36. Hatching Eggs
s.getAnimals().setAll(s.getAnimals()
.stream()
.flatMap(SpriteView.Eggs::hatch)
.collect(Collectors.toList())
);
36

37. 37

38. Reduce
Reduces a list to a single element given:
> Identity: T
> Accumulator: BinaryOperator<T>
Result: List of the same type, but only 1 element left.
38

39. And the (formerly little) Fox ate them all!
Double mealSize = shepherd.getAnimals()
.stream()
.map(SpriteView::getScaleX)
.reduce(0.0, Double::sum);
setScaleX(getScaleX() + mealSize * .2);
setScaleY(getScaleY() + mealSize * .2);
shepherd.getAnimals().clear();
39

40. 40

41. Mary Had a Little Lambda Project
> Open-source project to demonstrate lambda features
> Visual representation of streams, filters, and maps
41
https://github.com/steveonjava/MaryHadALittleLambda

42. Stuff to do…
> Changes to MaryHadALittleLambda:
 Change the number of sheep
 Make the rainbow have different colors
 Change the fox size to be fatter/skinnier
 Add new graphics (additional image files under images/extra)
42
camel.png lion.png greendragon.png cow.png Brownbear.png

43. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour
Hacking Time!

44. GPIO access

45. Wiring LEDs
> Wire the elements in
series:
 Connect the long end
of the LED to GPIO
 Connect the short end
of the LED to the
resistor
 Connect the resistor
to Ground
45
To GPIO To Ground

46. Using a Breadboard
> Pins are connected
horizontally in the center
> The edges are connect
vertically
> No current passes the
center line
46

47. Pi Cobbler
> Connects your Pi to the
Breadboard
> The white line is Pin 1
> Connect it in the center
top of your Breadboard
47

48. Pi4J
> The samples are located in
/opt/pi4j/examples
> Compile the samples by typing "./build"
> Instructions for running the samples are
printed out at the end of the build
> Pi4j needs root access to use GPIO (use
"sudo")
48

49. ControlGpioExample
49
> Demonstrates Controlling Pins:
 pin.low()
 pin.toggle()
 pin.pulse(duration, blocking)
> Try creating your own pattern!
sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample

50. Wiring Buttons
> Connect a circuit
across two legs
> While the button is
pressed…
 The legs numbered 1
and 2 are connected
 The legs numbered 3
and 4 are connected
50

51. ListenGpioExample
51
> Demonstrates Listening to a pin:
 addListener(pinListener)
> Change the message/action when
a button is pressed!
sudo java -classpath .:classes:/opt/pi4j/lib/'*' ListenGpioExample

52. BlinkGpioExample
52
> Use LEDs and Buttons together!
sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample

53. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour
Hacking Time!

54. LeJOS
How it works on the EV3

55. The Heart of the EV3
> TI Sitara AM1808
 ARM9, 300Mhz
> 64MB RAM / 16MB Flash
> Analog to Digital Converter
> 4 Motor Ports
> 4 Sensor Ports
> Bluetooth / USB
> MicroSD

56. EV3 Motors

57. EV3 Sensors

58. Color and Light Sensor

59. High frequency
sound waves
Measuring mode Vs Presence Mode
Ultrasonic Sensor

60. Infrared Sensor

61. Remote Control

62. Getting Started with LeJOS
> Micro SD Card (> 2GB)
> Compatible WIFI adapter
 NetGear WNA1100
 EDIMAX EW-7811Un
> Linux (or a Linux VM)
> Details here:
Creating Your SD Card
http://sourceforge.net/p/lejos/wiki/Home/

63. Lego Duke Segway

64. Bluetooth Pairing
> Make sure your Lego is turned on
> Open "Devices and Printers" from the
Start menu
> Click "Add a device"
> Select the Lego brick
> After pairing, right click on the new
device and choose "Connect using" >
"Access point"

65. Eclipse Setup
> Open Eclipse
> Go to "Preferences"
> Click on leJOS EV3
> Change the brick name to
"10.0.1.1"
65

66. Creating a New LeJOS Project
> Go to "File" > "New" > "Project…"
> Choose a LeJOS EV3 Project
66

67. Create a Class File
> Create a new class ("File" > "New"
> "Class")
> Give it a package (e.g. sample)
> Give it a name (e.g. LCDTest)
67

68. Simple LeJOS Application
import lejos.nxt.Button;
import lejos.nxt.LCD;
public class EV3FirstProgram {
public static void main(String[] args) {
LCD.clear();
LCD.drawString("First EV3 Program", 0, 5);
Button.waitForAnyPress();
LCD.clear();
LCD.refresh();
}
}

69. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour
Hacking Time!

70. Parts you will need Step 1
Assemble Brace

71. Step 2 Completed Brace
Assemble Brace

72. Parts you will need Step 1
Build Base

73. Step 2 Completed Base
Build Base

74. Motor parts Snap them on partially
Assemble Motor

75. Take motor and base And connect them like this
Assemble Motor

76. Foot parts Step 1
Add a Foot

77. Step 2 Add the Foot to the Base
Add a Foot

78. Assembled Foot and Base
Add a Foot

79. Lock parts Partially insert the red attachers
Add a Lock

80. Attach the lock Push down the red attachers to secure
Add a Lock

81. Tower parts Step 1 – push the rod all the way through
Construct the Tower

82. Step 2 Attach the Tower to the Base
Construct the Tower

83. Completed Tower
Construct the Tower

84. Fan Motor parts Step 1
Build the Fan Motor

85. Completed Fan Motor
Build the Fan Motor

86. Light Sensor parts Step 1
Construct the Light Sensor

87. Completed Light Sensor
Construct the Light Sensor

88. Fan Blade parts Step 1
Assemble the Fan Blades

89. Fan Blade, Light Sensor, and Fan Motor Completed Fan
Assemble the Fan

90. Assembled Wind Turbine
90

91. Wind Turbine Wiring
> Port A – Medium Moto
 Power Fan
> Port B – Large Motor
 Rotate Wind Turbine
> Port 1 – Light Sensor
 Track Ambient Light
91

92. Gear Box parts Step 1
EC: Gear Box Construction

93. Completed Fan with Gear Box
EC: Gear Box Construction

94. Making the Wind turbine turn
public class WindTurbine {
public static void main(String[] args) {
EV3MediumRegulatedMotor fan =
new EV3MediumRegulatedMotor(MotorPort.A);
fan.setSpeed(1500);
fan.setAcceleration(150);
fan.backward();
Delay.msDelay(10000);
}
}

95. Making the Tower spin
public class WindTurbine {
public static void main(String[] args) {
EV3LargeRegulatedMotor base =
new EV3LargeRegulatedMotor(MotorPort.B);
base.setSpeed(80);
base.rotateTo(-90);
base.rotateTo(90);
}
}

96. Checking the Ambient Light
public class WindTurbine {
public static void main(String[] args) {
EV3ColorSensor light =
new EV3ColorSensor(SensorPort.S1);
float[] sample = new float[1];
SensorMode mode = light.getAmbientMode();
mode.fetchSample(sample, 0);
LCD.drawString("Light = " + sample[0], 0, 4);
Delay.msDelay(5000);
}
}

97. Putting it all together…
> Can you write a program that will:
1. Rotate the fan in a circle
2. Check the ambient light while rotating
3. Move back to the brightest angle
4. Spin the fan
http://commons.wikimedia.org/wiki/Wind_generator#mediaviewer/File:Eolienne_et_centrale_thermique_Nuon_Sloterdijk.jpg

98. Stephen Chin
tweet: @steveonjava
blog: http://steveonjava.com
nighthacking.com
Real Geeks
Live Hacking
NightHacking Tour

99. Safe Harbor Statement
The preceding is intended to outline our general product
direction. It is intended for information purposes only, and
may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality,
and should not be relied upon in making purchasing
decisions. The development, release, and timing of any
features or functionality described for Oracle’s products
remains at the sole discretion of Oracle.