PHP,
Raspberry Pi,
& a lot of fun

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Forum PHP Paris, 21 nov 2013

/me

 

var me = {
    "user": "Ronan"
    , "age": 35
    , "origin": "Brittany"
    , "twitter": "@arno_u_loginlux"
    , "repo": "github.com/ronanguilloux"
    , "work": "cto@lespolypodes.com"
    , "tags": [
        "dad"
        , "bearded web developer"
        , "foss supporter"
    ]
}


PHP Appreciation Society Member

since 1999

3 sincere warns about PHP on Raspi

1/3: Raspberry Pi is...


not a production environment,
not scalable,
not safe for work
not entreprise-ready


and it's OK.

So...

HACK, LEARN, HAVE FUN

or STFU

2/3: PHP is serious IT after all. Raspi is not.



PHP is for web-based business

(or not)


~


Raspberry Pi is for week-end projects

(& vice-versa)

3/3: by design...

 

PHP is not for Hardware
(integrated circuits, controllers, sensors...)


~


Raspberry Pi is 100%
for learning & playing
with electronic hardware!

Meet the raspberry Pi

So this is how it started:
I bought a Rasberry Pi.

Meet the raspberry Pi

What’s a Raspberry Pi?

 

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It’s a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games. It also plays high-definition video. We want to see it being used by kids all over the world to learn (python) programming.

 

http://www.raspberrypi.org/faqs

Who did it?

 

The idea behind a tiny and cheap computer for kids came in 2006, when Eben Upton, Rob Mullins, Jack Lang and Alan Mycroft, based at the University of Cambridge’s Computer Laboratory, became concerned about the year-on-year decline in the numbers and skills levels of the A Level students applying to read Computer Science. From a situation in the 1990s where most of the kids applying were coming to interview as experienced hobbyist programmers, the landscape in the 2000s was very different; a typical applicant might only have done a little web design.

 

http://www.raspberrypi.org/about

Meet the raspberry Pi

  • not an open hardware
  • Broadcom BCM2835 700MHz ARM1176JZFS processor with FPU and Videocore 4 GPU
  • GPU provides Open GL ES 2.0, hardware-accelerated OpenVG, and 1080p30 H.264 high-profile decode
  • GPU is capable of 1Gpixel/s, 1.5Gtexel/s or 24GFLOPs with texture filtering and DMA infrastructure

Meet the raspberry Pi

  • SDRAM 512 Megabytes (MiB)
  • Boots from SD card, running Debian-based Raspbian “wheezy” or Arch Linux ARM GNU/Linux based distributions
  • Also: Fedora, Gentoo, Slackware, Firefox OS, Android
  • 10/100 BaseT Ethernet socket
  • Video outputs: Composite RCA, HDMI
  • Audio outputs: 3.5 mm jack, HDMI
  • Onboard storage: SD, MMC, SDIO card slot

Meet the raspberry Pi

Note the csi connector pins for digital camera!

Manufactured in Europe!

Raspi are manufactured in the UK,
at Sony's manufacturing facility in Pencoed, Wales.
1 million sold a year, since 2012.

GPIO pins!

#raspi for impatients

Where can I buy one?


$35 / 32.72 €

(26 € exc. VAT)

Power supply or SD cards are not included

#raspi for impatients

Essential accessories

a regular 5V / 1A smartphone charger
with mini micro USB cable

#raspi for impatients

Essential accessories

a regular USB Wireless Dongle

#raspi for impatients

Essential accessories

a SD CARD

#raspi for impatients

Essential accessories

(optional) a USB flash drive
Mind the box case!

#raspi for impatients

Essential accessories

a box case!

Use a cobbler breakout

see Adafruit

Will my USB Webcam fit?

 

check the community documentation:

 

http://elinux.org/RPi_VerifiedPeripherals

 

keyboards, bluetooth dongles, soundcards, 3G, IR, GPS, HDMI/DVI/VGA cables & converter boxes, webcams, TV tuners,...

Screen ?

 

To buy one of these monitors, search eBay for "Car TFT" and there will be loads of results. It should cost about £10 ($16). It requires a 12V power supply, since it is designed to be powered by a car battery, but you can power it with a regular power adaptor.

Cases, anyone?

Cases

Adafruit case

Note the handy slot for the 26-pin IDC cable!

Cases

Cases

wooden cases

Cases

Cases

Cases

Cases

Cases

Cases

Playing cards box is exactly the right size!

Cases

Cases

Cases

home printable cardboard cases

Cases

home printable cardboard cases

Wait a minute...

 

Where the hell did that come from?

microcontrollers

Arduino (& Arduino-like MC)

Arduino is a tool for making computers that can sense and control more of the physical world than your desktop computer. It's an open-source physical computing platform (...), and a development environment for writing software for the board.

ARM CPU

In 2011: 95% of smartphones, 90% of hard disk drives, 40% of digital televisions and set-top boxes, 15% of microcontrollers and 20% of mobile computers

 

GOOD NEWS: ARM is now actively targetted by many distro/packages providers: PHP, NodeJs,...

How many ARM cores
have you got at home?

Microsoft Surface, ASUS Eee Pad, Apple iPads, iPhones & iPods, Samsung Galaxy S2/S3/S4, Google Nexus 4/5/10, Google Chrome Book, Blackberry smartphones, Canon PowerShot A470 digital camera, Nintendo DS game console, TomTom GPS...

Wait a minute...

 

Who did?
Who inspired?
Who buy?

The Joy of DIY

Texas, 1942 (Wikimedia Commons)

"Makers?"

 

maker [ˈmeɪkə] - n.
 

people who hack hardware, business-models, and living arrangements to discover ways of staying alive and happy even when the economy is falling down the toilet.

Cory Doctorow, Makers, October 2009, [read it for free]

 

related: Dreamers, scientists, hackers, self-replicators, teachers, troublemakers, laser-lovers, scouts

"Maker subculture?"

 

The maker subculture is a contemporary subculture, representing a technology-based extension of DIY culture.

 

related: DIY, electronics, robotics, 3-D printing, home-automation / domotique, open-source-hardware, fablabs, cnc tools, metalworking, woodworking, knitting, traditional arts and crafts, no-patents

OMG, I see makers everywhere!

OMG, I see makers marketplaces everywhere!

Makers go mainstream

Check this talk from the author, Chris Anderson, formally of WIRED

Conclusions so far

  • Raspberry PI is a hackable device:
    1st value is software and hardware hackability
  • NSFW & not scalable AT ALL (but that's OK)
  • Running PHP is OK, but PHP was not designed for Hardwaring
  • hobbyist & educational purposes FTW
  • domestic robots, electronic breadboard & any pet projects that need CPU & network (you know, "Internet of things")

& why not...

  • Christmas gift for nephews
    (mind the AMIGA/ATARI/AMSTRAD effect)
  • home automation
  • domestic server (serve static HTML like a boss)
  • corporate, HTML5-friendly visual dashboards
  • interactive kiosks
  • public screens
  • artistic performances devices
  • (cheap & tiny) museums 2.0 device

DIY Projects they really made
with #raspi

2012 Internet of Things Award :

The new e-Health sensor platform adds sensing capability for nine different biometric parameters, such as pulse, blood pressure, oxygen in blood (SPO2), electrocardiogram (EKG), airflow, glucometer, galvanic skin response (GSR), patient position and body temperature, to give the Arduino and Raspberry Pi Community a way to develop new e-Health applications and products.

2012 Internet of Things Award :

The new e-Health sensor platform adds sensing capability for nine different biometric parameters, such as pulse, blood pressure, oxygen in blood (SPO2), electrocardiogram (EKG), airflow, glucometer, galvanic skin response (GSR), patient position and body temperature, to give the Arduino and Raspberry Pi Community a way to develop new e-Health applications and products.

Google Calendar, Raspberry Pi and Lights On / Lights Off

Google Calendar, Raspberry Pi and Lights On / Lights Off

Combining these ingredients:

  • an Elro "Wireless Home Control" set
  • a Raspberry Pi mini-computer
  • some soldering
  • some programming and
  • Google Calendar

= Have my lights switched on and off automatically based on a schedule I create in Google Calendar.

Spotify client

See e how-to, using Despotify

See also: github.com/Hexxeh/spotify-websocket-api (python)

Raspberry Strogonanoff

A Raspberry Pi Remote Mains Switcher

github.com/dmcg/raspberry-strogonanoff (python)

Controlling BigTrack Motors with my Raspberry Pi

RC Cars!

aonsquared.co.uk/the_dark_pi_rises
Also check pi-cars.com

Drooooones!

See instructables.com/id/Picopter
Also check Tricopter with Picopter Flight Control - Fpv Flight
&Picopter code shared on Github

OK,

I'm a nerd,

show me all the

how-to's

Revelation #0


~


on GNU/LINUX, everything is a file.

Wiring a simple LED with a resistor

The W1 kernel device driver

In /sys/class/gpio
there are two files that allow you to export pins for acces
and unexport pins to remove access. 

# modprobe w1-gpio
# cd /sys/class/gpio/
# ls
# export     gpiochip0  unexport

Enable GPIO access from user space


# GPIO=17
# cd /sys/class/gpio/gpio$GPIO
# echo $GPIO > export
# ls -l
total 0
--w------- 1 root root 4096 nov.  21 09:45 export
lrwxrwxrwx 1 root root    0 nov.  21 09:45 gpio17 -> ../../devices/virtual/gpio/gpio17
lrwxrwxrwx 1 root root    0 nov.  21 09:44 gpiochip0 -> ../../devices/virtual/gpio/gpiochip0
--w------- 1 root root 4096 nov.  21 09:44 unexport
Notice on the first ls that gpio17 doesn't exist,
but does after you export GPIO 17 to user space
There are files to set the direction and retrieve the current value. 
echo "in" > direction
cat value
You can configure the GPIO for output and set the value as well. 
echo "out" > direction
echo 1 > value

Deal with Kernel & permissions 1/2

accessing hardware, the right way.

With default settings the files in /sys/class/gpio are owned by user root and group root. Only the root user will have read/write permissions. We can change this with a udev rule. We create a file in /etc/udev/rules.d that contains the line:

KERNEL=="gpio*", SUBSYSTEM=="gpio", ACTION=="add", PROGRAM="/usr/local/bin/hipi-expin gpio /sys%p"

"Hey, I just want to blink a LED from my raspberry pi hosted website!"


~


=> Create a PHP LED blinker & allow Apache2 to run it

But WARN! Permissions make sens

$ sudo visudo
www-data ALL=NOPASSWD:/path/to/the/blinker

DEMO

Let's PHP all this


~


https://github.com/ronanguilloux/php-gpio

https://github.com/ronanguilloux/php-gpio-web

https://github.com/ronanguilloux/temperature-pi

https://github.com/tbibard/teleinfo-recorder

Meet the community

Read free magazines

TheMagPi.com

Tons of fabulous
week-end projects to achieve

Here we are!

 

Questions ?

 

This presentation is available on
ronanguilloux.github.com/Raspi-ForumPHP-2013

 

Attendies, thanks for feedback on joind.in!