Run a hat in a 32 bit pi 2

Support
1

Hi,

A while ago you helped me get a unicorn-hat working on a 64 bit pi 3, I also have a pi 2 that runs 32 bit, I can’t connect it to the net and download the unicorn-hat files so I am trying to copy the files so I can run the unicorn-hat on the pi 2.

I have copied the unicorn-hat directory and put it in the same place as the original.

I have slightly altered the line.py sketch so it gives me an xmas tree and renamed it xmas-tree.py

It runs fine on the pi 3.

this is the file I would like to run.

If I load it into geany from the uniform-hat directory on the pi 2 it compiles fine but when I execute it I get

Unicorn HAT HD: Lines

Demonstrates how to draw an xmas tree on Unicorn HAT HD.

Press Ctrl+C to exit!

Showing lines at rotation: 270
Traceback (most recent call last):
  File "xmas-tree.py", line 22, in <module>
    unicornhathd.show()
  File "/usr/lib/python2.7/dist-packages/unicornhathd/__init__.py", line 269, in show
    setup()
  File "/usr/lib/python2.7/dist-packages/unicornhathd/__init__.py", line 102, in setup
    _spi.open(0, 0)
IOError: [Errno 2] No such file or directory


------------------
(program exited with code: 1)
Press return to continue

I am assuming downloading the files from the internet on the pi 3 has added a file somewhere that the pi 2 is not seeing but I can’t work out the problem. I can find __init__.py but what is __spi.open(0, 0)?

Can you see my error??

thanks

Bob.

2

Is spi enabled / turned on, on the pi 2?

3

Hi alphanumeric,

After your prompt I did sudo raspi-config and in option 3/p4 I enabled SPI.

I then rebooted and the xmas tree showed up.

Thank you so much for your insight, I am indebted to you.

4

I’ve had the above error in the past, and did some head scratching at that time. You’ll get a similar error message if i2c isn’t enabled, but required. Been there done that, as they say. =)