Your SlideShare is downloading. ×
  • Like
Interfacing the Raspberry Pi to the World
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Now you can save presentations on your phone or tablet

Available for both IPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Interfacing the Raspberry Pi to the World

  • 6,930 views
Published

Presentation from the Open Source Hardware Camp held at Hebden Bridge on 15-16 Sepmtember 2012. Event details at: http://oshug.org/event/oshcamp2012

Presentation from the Open Source Hardware Camp held at Hebden Bridge on 15-16 Sepmtember 2012. Event details at: http://oshug.org/event/oshcamp2012

Published in Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
No Downloads

Views

Total Views
6,930
On SlideShare
0
From Embeds
0
Number of Embeds
8

Actions

Shares
Downloads
178
Comments
0
Likes
2

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Interfacing the Raspberry Pi to the WorldUp close and personal with P1 (and P5!) @OmerK | OSHCAMP 2012 | 15 Sep 2012
  • 2. omer.kilic.name
  • 3. Agenda● Mechanical Details● Electrical Details● Software Details● Tips for headless operation● Questions
  • 4. Mechanical● Standard 100mil (2.54mm) spacing – P1 → 2x13 way – P5 → 2x4 way
  • 5. M/F Jumper Cables
  • 6. M/F Jumper Cables
  • 7. IDC CableRe-use old floppy cables!
  • 8. http://www.raspberrypi.org/archives/1404
  • 9. “Breakout” boards Pi Cobbler from Adafruit
  • 10. Slice of Pi from Ciseco Pi Plate from AdafruitMore at: http://elinux.org/RPi_Expansion_Boards
  • 11. Electrical● P1 ● Power ● 3.3V (max I: ~50mA) ● 5V (max I: Power Supply - 700mA) ● 17 GPIO Pins, multiplexed with: ● UART ● I2C ● SPI ● PWM● P5 ● 4 extra GPIO pins ● Power● More signals broken out to S2 and S5 (Camera and flat panel connectors) ● Fiddly!http://elinux.org/RPi_Low-level_peripherals
  • 12. Revision 2 – Changes● Fuses protecting the USB outputs have been removed – Power the board via back-feeding hub● JTAG on P1● I2C peripherals swapped● P5 – New header: 4 more GPIO + Power● P6 – Reset Jumper● Mounting holes!!!!!!!!!!!! http://www.raspberrypi.org/archives/1929
  • 13. Revision 2
  • 14. Power (5V)
  • 15. Electrical 3.3V!
  • 16. 3.3V
  • 17. http://www.flickr.com/photos/56601859@N00/3064468115
  • 18. Use protection● Level Shifting – Logic buffers (74HCT242) – Birectional translators (TXB0108) – Discrete shifters (FETs + Rs)● Current limiting R
  • 19. Recommended Distro Occidentalis by Adafruithttp://learn.adafruit.com/adafruit-raspberry-pi-educational-linux-distro/overview
  • 20. Software● Peripherals are memory mapped – Access via /dev/mem ● Faster, needs root, hacky, dangerous! – Use kernel modules/sysfs ● /sys/class/gpio/gpioX/value etc. ● Slower, doesnt need root, easier, (relatively) safer
  • 21. Software – GPIO● /sys/class/gpio/ (export|direction|value|interrupt|unexport)● Example: – echo 17 > /sys/class/gpio/export – echo “out” > /sys/class/gpio/gpio17/direction – echo “1” > /sys/class/gpio/gpio17/value● Interrupt support – Use poll() on /value
  • 22. Software – I2C● /dev/i2c-0 and /dev/i2c-1● Install the i2c-utils package – i2cdetect, i2cdump, i2cget, i2cset● Support for kernel hardware modules: – echo ds1307 0x68 > /sys/class/i2c-adapter/i2c- 0/new_device● i2c-dev details: – http://kernel.org/doc/Documentation/i2c/dev-interface
  • 23. Software – SPI● /dev/spidev0.0 and /dev/spidev0.1 – Chip select pins● Support for kernel hardware modules: – Need to rebuild kernel!● spidev details: – http://kernel.org/doc/Documentation/spi/spidev
  • 24. Software – PWM● No kernel module (or libgpio) support, memory mapped voodoo necessary.● WiringPi example: – pinMode(1, PWM_OUTPUT); – PwmWrite(500);
  • 25. Libraries● Python – Quick2wire, Rpi.GPIO● C – WiringPi, pihwm● Bindings also available for Java(!), Ruby, Erlang
  • 26. Tips for headless operation● Use 240/16 (CPU/GPU) RAM split – No need for graphical stuff● Setup avahi/zeroconf – No need to remember IP address ● ssh raspberrypi.local● Setup mosh – Great for intermittent networking
  • 27. Questions?