This document summarizes an Internet of Things magic show presented by Stephen Chin and Angela Caicedo at a JavaOne conference. The show demonstrated three magic tricks enabled by IoT technologies: 1. Mind reading: A jacket with sensors gave feedback to correctly predict the audience member's selection from a menu. 2. Lightning reflexes: An IoT-enabled grabber reacted in real-time to lights and sounds to play a game. 3. Materialization: A 3D printer was used to demonstrate making objects appear from nothing using code and IoT technologies. The show highlighted how IoT, Java, sensors, actuators and other technologies can enable interactive experiences and "magic" through

1. Internet of Things Magic Show
Stephen Chin (@steveonjava)
Java Technology Evangelist
JavaOne Conference Chair
Angela Caicedo (@acaicedo)
Java Technology Evangelist

2. World Population 6.3 Billion 6.8 Billion 7.2 Billion 7.6 Billion
500 Million 12.5 Billion 25 Billion 50 Billion
Connected Devices
per Person
0.08 1.84 6.583.47
2003 2010 20202015
Source: Cisco
3x 5x1x
Connected
Devices

3. From…
Things
Connected to
the Internet
www.

4. To…
The Internet
of Things

5. Java and 3G in a Tiny Package
• Cinterion EHS5

6. Really Tiny…
27.6mm
18.8mm

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

8. Java SE 7
Last Year
APIs Language
Java SE 7
CDC 1.1
CDC 1.1
(based on SE 1.4.2)
CLDC 1.1
(based on SE 1.3)
CLDC 1.1
8

9. Java SE 8Java SE 8
Java ME 8
Java 8 availability
Java ME 8
APIs Language
9

10. More Information
iotcommunity.net
oracle.com/goto/javaembedded
oracle.com/iot
Twitter Facebook Java Blog LinkedIn YouTube
@Java Embedded blogs.oracle.com/java Embedded Java
Developers Network
ILoveJava YouTube Java Channel

11. What is Magic?
11

12. 12
https://www.flickr.com/photos/pasukaru76/5944308910/

13. 13
https://www.flickr.com/photos/blackzack00/15350928735/

14. 14
https://www.flickr.com/photos/kwl/4743024076/

15. 15
https://www.flickr.com/photos/kthai/4755380370/

16. Now it is time for real magic!
16

17. 17
Trick 1:
Mind Reading

18. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 18
SENSORS

19. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 19
MY VISION

20. The Jacket

21. The Jacket

22. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 22
INGREDIENTS

23. Conductive Thread
Fabric Ribbon 4-Channel
The Ingredients: Hardware
Raspberry Pi B+ Woven Conductive
Fabric
Pressure-Sensitive
Conductice Sheet
LEDs LilyPad Vibe Board

24. The Ingredients: Hardware
Polar Heart Rate Receiver
Polar T34 Heart Rate Transmitter
NTSC/PAL Video Glasses
PN532 NFC/RFID controller
breakout board
GPS
ADC1015
MPR121
Capacitive Touch
Sensors

25. Now, The Real Hardware
I bet there is at LEAST one you have never used it before….

26. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 26
RFID ENABLED

27. RFID reader
Radio-Frequency Identification

28. How does it work?
RFID transmitter
PN532 NFC/RFID controller
breakout board
Raspberry Pi B+
JavaFX UI
Magnetic Field

29. Serial Communication
final Serial serial = SerialFactory.createInstance();
try {
serial.open("/dev/ttyAMA0", 115200);
serial.write(wakeUP);
for (int i = 0; i < SAMConfiguration.length; i++) {
System.out.printf("%02X ", SAMConfiguration[i]);
}
serial.write(SAMConfiguration);
...
for (;;) {
try {
Thread.sleep(1000);
serial.write(poll);
} catch (InterruptedException ex) {...}
}
} catch (Exception e) {...
} finally {serial.close();}
29

30. Listening for cards
serial.addListener(event -> {
try {
String data = event.getData();
StringBuilder buffer = new StringBuilder();
byte[] array = data.getBytes("UTF-16");
String outStr = "";
if (array.length >= ENOUGH_DATA) {
for (int i = (array.length - POS_ID); i < array.length; i++) {
outStr += String.format("%02X", array[i]);
}
findCard(outStr);
}
serial.write(ack);
} catch (UnsupportedEncodingException ex) {
System.out.println("Error: " + ex);
}
});
30

31. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 31
FEEDBACK

32. Feedback Required
1
2
3
4
Did the menu pick up my selection
Is something happening or should I click again
Simple but concrete feedback
Easy to implement, simple GPIO
Useful but not enough5

33. Display

34. Assembling the Display

35. 35
Trick 2:
Lightning Reflexes

36. 36

37. 37

38. 38

39. 39

40. 40

41. 41

42. Up-Up-Down-Down-Left-Right-
Left-Right B, A, Start
42

43. Meet Mr. Grabby
43
https://www.flickr.com/photos/pasukaru76/8278458818/
https://www.flickr.com/photos/fallentomato/5656700432/
+ =

44. Meet Mr. Grabby
44

45. Mr. Grabby's Back
45
Controller
Grabber

46. Controller
• Raspberry Pi
• Cooking Hacks Shield
• MakeBlocks ME Base Shield
46

47. Mr. Grabby's Belly
47
Line Follower
Batteries
DC Motors

48. How Line Followers Work
48
• Infrared LED
– Bounced light off the ground
• Infrared Luminosity Sensor
– Detects reflected light

49. Getting GPIO
gpio = GpioFactory.getInstance();
lineFollowA = gpio.provisionDigitalInputPin(
RaspiPin.GPIO_13, "LineFollowA");
lineFollowB = gpio.provisionDigitalInputPin(
RaspiPin.GPIO_14, "LineFollowA");
startGPIO();
boolean leftSensor = lineFollowA.getState().isHigh();
boolean rightSensor = lineFollowB.getState().isHigh();
49

50. Line Following Algorithm
if (leftSensor && rightSensor) { //we are lost
doDrive(lineLocation);
} else if (!leftSensor && !rightSensor) { //on the line
lineLocation = Drive.forward; doDrive(Drive.forward);
} else if (!leftSensor && rightSensor) { //off the right
lineLocation = Drive.left; doDrive(Drive.forward);
} else if (leftSensor && !rightSensor) { //off the left
lineLocation = Drive.right; doDrive(Drive.forward);
}
50

51. Make your own Mr. Grabby
• MakeBlock Advanced Robotics Kit
• MakeBlock ME Base Shield
• Cooking Hacks Shield
• USB Battery (1A)
• Code here:
https://github.com/steveonjava/LineFollower
51

52. 52
Trick 3:
Materialization!

53. Disappearing Handkerchief
53

54. Making Birds Vanish
54

55. But What About Making Things Appear?
55

56. Ultimaker 2
56

57. 57

58. Java Constructive Geometry (JCSG / JFXScad)
• Create geometries from pure Java code
• Visualize with a JavaFX user interface
• Generate STL files for 3D printing
• Project sites:
https://github.com/miho/JCSG
https://github.com/miho/JFXScad
58

59. 59

60. What is Magic?
60

61. 61
YOU!

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

63. Safe Harbor Statement
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functionality described for Oracle’s products remains at the sole discretion of Oracle.
63