rpi_ws281x library

[jstott]

Hi guys,

I am following a tutorial on 'how to control neopixel leds with python on a raspberry pi' the link is as follows: https://learn.adafruit.com/neopixels-on ... i/software

I am having trouble executing a test file in the LX Terminal on the Raspberry Pi. The test file is 'strandtest.py' which I have edited using the text editor programme so that the LED_COUNT is correct as per my design which consists of a total of 30 NeoPixel LEDs. When I come to run the programme in the LX Terminal window, I encounter a problem which states: 'python: can't open file 'strandtest.py': [Errno 2] No such file or directory', even though the file does exist!

Please could somebody tell me where I am going wrong. I am completely new to the Raspberry Pi and this is my very first project!

Kind Regards,

JS

[adafruit_support_rick]

What is your current working directory when you try to run strandtest.py? Is it the same directory that contains strandtest.py?

[jstott]

Thank you for your response!

From what you are saying I think the directory is Python? The full command is actually 'sudo python strandtest.py' and I enter this command in the LX Terminal window. I am doing exactly what the tutorial describes but I am getting the error message!

Regards,

JS

[adafruit_support_rick]

No, the directory is not "python". That is the actual command in the command line.

Do this command:
pwd
That will print your working directory.
You can also do
ls
to see if strandtest.py is in your current working directory.

[jstott]

I typed 'pwd' into the LX Terminal and it returned: /home/pi

I typed 'Is' into the LX Terminal and it says: bash: Is: Command not found

regards,

JS

[adafruit_support_mike]

The command 'ls' is lowercase-L lowercase-S, not uppercase-i lowercase-S.

It's a contraction of 'LiSt'.

[jstott]

Ok so the 'ls' command shows 'Desktop python_games rpi_ws281x'

Regards,

JS

[adafruit_support_rick]

OK so you need to get into the same directory that contains strandtest.py.

What directory did you put strandtest.py into? Use the cd command to change your working directory to that directory.

[jstott]

I have done it now! I managed to run the strandtest.py script by finding the folder that it was located in and using the 'cd' command to run it!

Thanks for your help!

Kind Regards

JS

[adafruit_support_rick]

You're welcome!

[jstott]

Do you have any advice on how to run this script over the internet? i.e. so that it can be accessed via a mobile phone?

Regards,

JS

[adafruit_support_rick]

You would need to run ssh on your mobile phone, and connect to your Pi that way.

https://learn.adafruit.com/adafruits-ra ... -using-ssh