On 10/11/2020 20:43, RobH wrote:
> On 10/11/2020 20:28, Dennis Lee Bieber wrote:
>> On Tue, 10 Nov 2020 20:08:09 +0000, RobH  declaimed
>> the
>> following:
>>
>>> I ssh'd into my pi zero, then I created the script with : sudo nano
>>> script.py then copied some other python script into the new script.py.
>>> I then ran sudo python3 script.py from within the directory the said
>>> script is in, which is the Downloads directory.
>>> Nothing happens, no errors, no leds lit.
>>>
>>     My first question is: WHY use "sudo". Isn't the regular user
>> account a
>> member of a group that has access to GPIO?
>>
>> pi@rpi3bplus-1:~$ groups
>> pi adm dialout cdrom sudo audio video plugdev games users input netdev
>> gpio
>> i2c spi
>>
>>     My second would be: Show us the CODE AND the commands you are
>> performing... Don't just "say" what you did -- cut&paste directly from
>> the
>> SSH console into a message.
>>
>>
>>> If I open a terminal window on the pi desktop and run the exact same
>>> sudo python3 script.py, it runs and the leds light up
>>
>>     Again -- show us (cut&paste) the exact command sequence being
>> performed.
>>
>>     However...
>>
>> pi@rpi3bplus-1:~/Downloads$ groups
>> pi adm dialout cdrom sudo audio video plugdev games users input netdev
>> gpio
>> i2c spi
>> pi@rpi3bplus-1:~/Downloads$ sudo groups
>> root
>> pi@rpi3bplus-1:~/Downloads$
>>
>> ... the root user (sudo) does NOT appear to have access to GPIO, SPI,
>> I2C,
>> etc.
>>
>>     Without seeing the script one can not tell if errors are being
>> swallowed or just being ignored.
>>
>>
>
> This is the script:
>
> pi@raspberrypi:~/Downloads $ sudo nano ledstest.py
>
> import board
> import neopixel
> from time import sleep
>
> pixels = neopixel.NeoPixel(board.D18, 56, brightness =1)
> pixels.fill((0, 0, 0))
> sleep(2)
> pixels.fill((0, 0, 255))
> pixels.show()
>
> pi@raspberrypi:~/Downloads $ sudo python3 ledstest.py
> pi@raspberrypi:~/Downloads $
>
>
pi@raspberrypi:~/Downloads $ groups
pi adm dialout cdrom sudo audio video plugdev games users input netdev
gpio i2c spi
pi@raspberrypi:~/Downloads $ sudo groups
root
pi@raspberrypi:~/Downloads $

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