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ADC Reading Tutorial

965 Views - Created 07/08/2020

07/08/2020

Posted by:
GrahamT

Greetings.

I recently purchased the Expander Pi, as a novice I rely heavily on the tutorial on the website. I successfully worked my way through the tutorial on reading and writing to the IO pins but struggling with the “demo_adcread.py” when I first run the program I had a problem with the Libraries not being installed correctly, so I poked and prodded a bit… I now get the following when I run the program:

Python 3.7.3 (/usr/bin/python3)

>>> %cd /home/pi

>>> %Run demo-adcread2.py

Traceback (most recent call last):

File "/home/pi/demo-adcread2.py", line 16, in <module>

adc = ADC() # create an instance of the ADC

File "/usr/local/lib/python3.7/dist-packages/ExpanderPi/ExpanderPi.py", line 122, in __init__

self.__spiADC.open(0, 0)

FileNotFoundError: [Errno 2] No such file or directory

>>>

Thank you in advance

07/08/2020

Posted by:
andrew

Location:
United Kingdom

Hello Graham

Have you enabled the SPI bus on your Raspberry Pi? Try going through the steps in our SPI tutorial and see if that fixes the problem.

07/08/2020

Posted by:
GrahamT

And just like waving... it works...

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