Class does not work with Pi2 due to RPi.GPIO not working (yet)

[liamkennedy]

Just a heads up (which you probably already know).. this class does not work in a Pi2 due to the RPi.GPIO library not supporting the Pi2 currently. I have heard there is a Dev version of RPi.GPIO available. I have not yet tried that.

Thanks!

-Liam

AH
That why I couldn't get it to work
Thanks

[liamkennedy]

The folks from PiMoroni sent me to this branch of the library which does not need to use RPi.GPIO
https://github.com/gadgetoid/piglow

[Boeeerb]

Thanks for keeping everyone updated Liam!
It's a very easy fix, as all RPi.GPIO does is check what version of Pi you have so it knows which i2c bus to use.
I haven't got round to getting myself a Pi2 yet, but after seeing the changes it didn't seem like there is anything I needed to update, just await on the dependancies to catch up. I know there are other ways around the version check, but not had time to play yet.

hi
when im trying to run any script i get this,

pi@raspberrypi ~/PiGlow $ sudo python cpu.py
Traceback (most recent call last):
File "cpu.py", line 13, in
piglow = PiGlow()
File "/home/pi/PiGlow/piglow.py", line 25, in init
self.bus = SMBus(i2c_bus)
IOError: [Errno 2] No such file or directory

im new to this so i don't know what it means or what to do about it.
thanks

[liamkennedy]

type this command

sudo nano /boot/config.txt

and add this line to the end of your /boot/config.txt file

dtparam=i2c_arm=on

Thanks
I will try this when I get home and report back

[liamkennedy]

Make sure you reboot after making this change to /boot/config.txt

This is what made everything work for me...and I got the same error as you did.

[DougRamsey]

I had this excact same issue with my pi2 and the suggested fix to the config.txt and the new piglow installlaton and reboot resulted in the exact same i/o error. Wonder why this did not work for me?

[electronicsguy]

If you're uncomfortable with manually entering those commands, just do "sudo apt-get update" && sudo apt-get upgrade and then use raspi-config to enable I2C bus. It has been updated to use the new device trees.

[liamkennedy]

@DougRamsey - you have to also use the workaround piglow.py I referenced above.
https://github.com/gadgetoid/piglow

Have you done that or are you still using the one in this library?

[DougRamsey]

Thanks electronics guy and liamkennedy
Tried both suggestions and still get the following when trying to use PyGlow module on the pi2
pi@raspberrypi ~/PiGlow/Examples $ sudo python test.py
Traceback (most recent call last):
File "test.py", line 9, in
piglow = PiGlow()
File "/usr/local/lib/python2.7/dist-packages/piglow.py", line 25, in init
self.bus = SMBus(i2c_bus)
IOError: [Errno 2] No such file or directory

Not sure if the setup took care of installing the piglow file you mentioned above. I am new to pi and lynux so help is appreciated.

[liamkennedy]

I'm at a loss to know what else to suggest. If you changed config.txt and you are using the replacement piglow.py code I have no further ideas. Sorry

[electronicsguy]

@DougRamsey Did you do install the python smbus module? Do this and then try again:

sudo apt-get install python-smbus

[DougRamsey]

Thanks electronicsguy liamkennedy and I have installed the smbus. Might just be the pi2 don't yet work with piglow. I have my project on the b+ board and all is well with it.

Do either of you have piglow working on pi2?

[liamkennedy]

I can assure you the PiGlow works on the Pi2. I have it working just fine with my ISS-Above project and I have an image with my code that works just great.

Perhaps my base image I used to support the Pi2 had some other code installed that made this work more easily. I don't know what that might be.