2. Raspberry Pi
with
Java
koji lin@twjug 2013/6/29

4. About Raspberry Pi
● A credit-card-sized single-board computer
developed in the UK by the Raspberry Pi
Foundation
● Eben Upton
– Co-founder of the Raspberry Pi
– Chip architect at Broadcom
● For education purpose
– Promoting the teaching of basic
computer science in schools

6. Raspberry PI Model B
● SoC Broadcom BCM2835
● CPU
– ARM 11/700MHZ (ARMv6)
● GPU
– Broadcom VideoCore IV,
OpenGL ES 2.0, 1080p30 h.264/MPEG-
4 AVC high-profile
decoder

7. Raspberry PI
● Memory
– 512MB
● IO
– HDMI
– 2 x USB
– Ethernet
– Header pins for GPIO, UART,
SPI and I2C
● Power Only 3.5 W

8. Just $35

9. Attention
● Power supply is important
● SD card
– Class 10 and > 4G
● If you use Linux dd, please double check your
command

10. For ?
● A small computer
– A bit slower..
● Media center
– Raspbmc
– OpenELEC
– Xbian

11. For ?
● A small computer
– A bit slower..
● Media center
– Raspbmc
– OpenELEC

12. For ?
● A small computer
– A bit slower..
● Media center
– Raspbmc
– OpenELEC
● NAS
● Wireless Access Point
● Programming
● Game

13. Minecraft Pi Edition

14. Minecraft Pi Edition

15. Pi Camera Module

16. Pi Camera Module

17. And More

18. Operating System
● Raspbian(Debian) “wheezy”
● Soft-float Debian “wheezy”
– Ex: for Oracle JVM
● Arch Linux ARM
● Pidora
● RISC OS
● FreeBSD
● Android
● Firefox OS

19. New Out of Box Software

20. New Out of Box Software
● It's easy
● Copy to SD Card
● Will partition for you
● Give you the choice of OS
● Includes recovery partition

21. Programming
● Python as the educational language
– Python 2.7.3
● Any language can compile for ARMv6
● The most interesting part is controlling
GPIO

22. GPIO

23. Attention
● GPIO IN/OUT is 3.3v
– Do not use voltage levels greater than 3.3V
– Arduino is 5V
● Do not connect power supply to any other pin
● Be careful of static electricity

24. Java on PI
● Java SE Embedded
– 32~64MB/37~46MB RAM/ROM
– Java SE Embedded 7 (Soft float)
– Java SE Embedded 8 + JavaFX (Hard float)
● Java ME Embedded
– 8MB/5MB RAM/ROM
– Java ME Embedded 3.3

25. Pi4J
● Provide a bridge between the native
libraries and Java for full access to the
Raspberry Pi

27. Pi4J Example1

29. Resistor Calculator
● Download them on Google Play & App Store

30. Pi4J Example2

32. Stepper Motor
GPIO3 GPIO4 GPIO5 GPIO6
1 OFF ON ON ON
2 ON OFF ON ON
3 ON ON OFF ON
4 ON ON ON OFF

33. Pi4J Example3

34. Pulse Width Modulation
AlwaysON
On/Off
週期