Raspberry Pi 2- What works and what doesn't!

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#Jessie

If you’ve just got started with a Pi 2, chances are you’ll want to run Raspbian Jessie. It’s the new hotness and makes a some things easier and simpler to install. Check it out here: https://www.raspberrypi.org/downloads/raspbian/

##If you’re updating an old Raspbian

A new stable Raspbian kernel is available, at last. This comes complete with the release of RPi.GPIO which will get most of your Pimoroni goodies back up and running pronto- except the Unicorn HAT, we’re still working on that, sorry!

Thank you Ben, wherever you are!

To get updates, fire up your Pi 2, connect it to a network ( via ethernet or Wifi ) and type this into the terminal:

sudo apt-get update
sudo apt-get upgrade

You should see something like this:

The following packages will be upgraded:
  libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc libraspberrypi0 python-rpi.gpio python3-rpi.gpio raspberrypi-bootloader sonic-pi

Hit Y, and Enter to continue, wait for it to finish, and reboot your Pi to a working add-on! Yay.

#DFRobot USB 2.8" Display

Changes to accomodate AstroPi/SenseHAT have made it much, much easier to get the DFRobot USB 2.8" display up and running. I’ve now created a GitHub repository for just this which, once downloaded, will install easily on Pi 1 or Pi 2 - just run the installer and reboot!

More info here: https://github.com/pimoroni/rp_usbdisplay

#Unicorn HAT
Working

To get the latest Unicorn HAT library you should:

sudo pip install unicornhat --upgrade

This work on Pi 2 and Pi 1.

###Known issues:

  • munmap errors and memory leak reports when exiting scripts
  • runs much faster than the old library, so the timings of your blinky effects may be waaay off

#Working

  • UnicornHAT sudo pip install unicornhat --upgrade
  • PiGlow
  • Skywriter HAT
  • Display-o-Tron 3000
  • Pibrella
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PiGlow. Working. Only needs I2C and absolutely should work!???

Preparations made…

i2c libraries (SMBus) and python support are installed.
i2c driver modules are enabled and not blacklisted.

But error found…

pi@raspberrypi ~/piglow-master/examples sudo python piglow-example.py Traceback (most recent call last): File "piglow-example.py", line 52, in <module> piglow = PiGlow(1) File "piglow-example.py", line 21, in __init__ self.bus = SMBus(i2c_bus) IOError: [Errno 2] No such file or directory pi@raspberrypi ~/piglow-master/examples

Why? Thanks for any ideas… Hope RPI GPIO gets fixed soon too…

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What do you get if you:

ls /dev/i2c*

Looks like either I2C isn’t properly enabled, possibly not in /boot/config.txt.

or

You’re using a PiGlow example which expects /dev/i2c-0 rather than /dev/i2c-1.

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I got the Display O Tron working with my Raspberry Pi 2 by manually installing the RPi GPIO package from sourceforge.

Do the following to get it up and running:
(we won’t need to do this once v0.5.10 of RPi GPIO is released)

sudo apt-get update
sudo apt-get install build-essential python-dev python-pip mercurial
cd ~
hg clone http://hg.code.sf.net/p/raspberry-gpio-python/code raspberry-gpio-python-code
cd raspberry-gpio-python-code
sudo python setup.py install

Not managed to get the Unicornt hat working though :(

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This works, but I wouldn’t recommend it since it’s still pre-release software that also depends on pre-release and bleeding-edge updates to Raspbian, so it’s a bit of a dive into the unknown!

You seem to know what you’re doing though, so carry on!

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Where is your new script? I am having no luck getting pillow to work on the new Rspi 2.
Please reply! Thank you

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Where is your new script? I am having no luck getting pillow to work on the new Rspi 2.
Please reply! Thank you

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What errors are you encountering?

It might be that you need my quick-fix for Raspbian’s timing issue ( this saves potentially blowing everything up with rpi-update ): https://gist.github.com/Gadgetoid/57084ec5817142a118ac

And you may also need to make sure you re-enable I2C via raspi-config.

Also, go into a Terminal and:

ls /dev/i2c*

To make sure the devices are even showing up.

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Sorry I’m a beginner. I got this pi@raspberrypi ~ ls /dev/i2c* /dev/i2c-1 pi@raspberrypi ~

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Sorry I’m a beginner. I got this

pi@raspberrypi ~ ls /dev/i2c* /dev/i2c-1 pi@raspberrypi ~

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That’s a good start! Which PiGlow example are you trying to run ( where did you get it from? ) and what sort of errors are you encountering?

It might be something as simple as you not running it as root (the magical sudo prefix) since that’s a common omission, try:

sudo ./the-example-youre-trying-to-run.py
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This one sudo python test.py

from https://github.com/Boeeerb/PiGlow

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Also, when i try to run it i get this message

File “/home/pi/piglow/clock.py”, line 7, in
from piglow import PiGlow
File “/home/pi/piglow/piglow.py”, line 16, in
import RPi.GPIO as rpi
RuntimeError: This module can only be run on a Raspberry Pi!

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Okay! I see the problem. This PiGlow library includes RPi.GPIO to detect the Pi version, and this doesn’t have a stable release for the Pi 2 yet.

I’ve just created a fork for you here: https://github.com/Gadgetoid/PiGlow

Go into Terminal/LXTerminal and:

git clone https://github.com/Gadgetoid/PiGlow
cd PiGlow
sudo python setup.py install

Then try an example!

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Thank you for your time! I have done that, what shall i do now?

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Try re-running the example code, what happens now?

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THANK YOU SO MUCH! I was beginning to looses all hope! I love you (Not literally) lol! Thank you so much! i was going to upload a photo but it won’t let me

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You’re welcome! You should also be able to add photos now.

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Very Bright! Thanks again!

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