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![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();
}
}](https://image.slidesharecdn.com/jcretejavaworkshop-140829013515-phpapp02/75/JCrete-Embedded-Java-Workshop-44-2048.jpg)
![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);
}
}](https://image.slidesharecdn.com/jcretejavaworkshop-140829013515-phpapp02/75/JCrete-Embedded-Java-Workshop-69-2048.jpg)
![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);
}
}](https://image.slidesharecdn.com/jcretejavaworkshop-140829013515-phpapp02/75/JCrete-Embedded-Java-Workshop-70-2048.jpg)
![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);
}
}](https://image.slidesharecdn.com/jcretejavaworkshop-140829013515-phpapp02/75/JCrete-Embedded-Java-Workshop-71-2048.jpg)
Uploaded byStephen Chin
JCrete Embedded Java Workshop
The document provides a comprehensive guide for setting up and using Java with Raspberry Pi and LEGO EV3, detailing steps to install Java, connect hardware components, and execute sample applications. It includes specific wiring instructions for LED and button connections, and offers examples of programs to control motors and sensors. Additionally, it emphasizes safety precautions and references for troubleshooting and enhancements.
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- 1. JCrete Embedded Java Hacking Stephen Chin Java Technology Ambassador JavaOne Content Chair @steveonjava
- 2.
- 3.
- 4. Java and 3Gin a Tiny Package > Cinterion EHS5
- 5. Really Tiny… 27.6mm 18.8mm
- 6.
- 7. = Have JavaWith Your Dessert Raspberry Pi
- 8.
- 9. Chalkboard Electronics Touchscreen 10" or 7" Form Factor Connects via HDMI/USB Tested with JavaFX 8 10% Exclusive Discount: G1F0U796Z083
- 10. How to SetupYour 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/
- 11. 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 11
- 12. What Comes inYour 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
- 13. Hooking Up thePi (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) 13 Important: Connect everything before plugging into the wall
- 14. Hooking Up thePi (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 14 Verify connections and plug into power now
- 15. 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
- 16. Logging In Atthe login prompt type your username: > pi And enter the password: > raspberry
- 17. Running the JavaFXSample Application Change directory to the project folder > cd MaryHadALittleLambda Run the build script > ant
- 18.
- 19. 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
- 20. Mary Had aLittle Lambda Project > Open-source project to demonstrate lambda features > Visual representation of streams, filters, and maps 20 https://github.com/steveonjava/MaryHadALittleLambda
- 21. 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) 21 camel.png lion.png greendragon.png cow.png Brownbear.png
- 22.
- 23. 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 To GPIO To Ground 23
- 24. Using a Breadboard > Pins are connected horizontally in the center > The edges are connect vertically > No current passes the center line 24
- 25. Pi Cobbler >Connects your Pi to the Breadboard > The white line is Pin 1 > Connect it in the center top of your Breadboard 25
- 26. Pi4J > Thesamples 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") 26
- 27. ControlGpioExample 27 >Demonstrates Controlling Pins: pin.low() pin.toggle() pin.pulse(duration, blocking) > Try creating your own pattern! sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample
- 28. 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 28
- 29. ListenGpioExample 29 >Demonstrates Listening to a pin: addListener(pinListener) > Change the message/action when a button is pressed! sudo java -classpath .:classes:/opt/pi4j/lib/'*' ListenGpioExample
- 30. BlinkGpioExample 30 >Use LEDs and Buttons together! sudo java -classpath .:classes:/opt/pi4j/lib/'*' BlinkGpioExample
- 31. LeJOS How itworks on the EV3
- 32. The Heart ofthe EV3 > TI Sitara AM1808 ARM9, 300Mhz > 64MB RAM / 16MB Flash > Analog to Digital Converter > 4 Motor Ports > 4 Sensor Ports > Bluetooth / USB > MicroSD
- 33.
- 34.
- 35. Color and LightSensor
- 36. High frequency soundwaves Ultrasonic Sensor Measuring mode Vs Presence Mode
- 37.
- 38.
- 39. Getting Started withLeJOS Creating Your SD Card > Micro SD Card (> 2GB) > Compatible WIFI adapter NetGear WNA1100 EDIMAX EW-7811Un > Linux (or a Linux VM) > Details here: http://sourceforge.net/p/lejos/wiki/Home/
- 40. 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"
- 41. Eclipse Setup >Open Eclipse > Go to "Preferences" > Click on leJOS EV3 > Change the brick name to "10.0.1.1" 41
- 42. Creating a NewLeJOS Project > Go to "File" > "New" > "Project…" > Choose a LeJOS EV3 Project 42
- 43. Create a ClassFile > Create a new class ("File" > "New" > "Class") > Give it a package (e.g. sample) > Give it a name (e.g. LCDTest) 43
- 44. 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(); } }
- 45. Assemble Brace Partsyou will need Step 1
- 46. Assemble Brace Step2 Completed Brace
- 47. Build Base Partsyou will need Step 1
- 48. Build Base Step2 Completed Base
- 49. Assemble Motor Motorparts Snap them on partially
- 50. Assemble Motor Takemotor and base And connect them like this
- 51. Add a Foot Foot parts Step 1
- 52. Add a Foot Step 2 Add the Foot to the Base
- 53. Add a Foot Assembled Foot and Base
- 54. Add a Lock Lock parts Partially insert the red attachers
- 55. Add a Lock Attach the lock Push down the red attachers to secure
- 56. Construct the Tower Tower parts Step 1 – push the rod all the way through
- 57. Construct the Tower Step 2 Attach the Tower to the Base
- 58. Construct the Tower Completed Tower
- 59. Build the FanMotor Fan Motor parts Step 1
- 60. Build the FanMotor Completed Fan Motor
- 61. Construct the LightSensor Light Sensor parts Step 1
- 62. Construct the LightSensor Completed Light Sensor
- 63. Assemble the FanBlades Fan Blade parts Step 1
- 64. Assemble the Fan Fan Blade, Light Sensor, and Fan Motor Completed Fan
- 65.
- 66. Wind Turbine Wiring > Port A – Medium Moto Power Fan > Port B – Large Motor Rotate Wind Turbine > Port 1 – Light Sensor Track Ambient Light 66
- 67. EC: Gear BoxConstruction Gear Box parts Step 1
- 68. EC: Gear BoxConstruction Completed Fan with Gear Box
- 69. Making the Windturbine 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); } }
- 70. Making the Towerspin public class WindTurbine { public static void main(String[] args) { EV3LargeRegulatedMotor base = new EV3LargeRegulatedMotor(MotorPort.B); base.setSpeed(80); base.rotateTo(-90); base.rotateTo(90); } }
- 71. Checking the AmbientLight 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); } }
- 72. Putting it alltogether… > 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
- 73. Stephen Chin tweet:@steveonjava blog: http://steveonjava.com NightHacking Tour Real Geeks Live Hacking nighthacking.com
- 74. 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.