It looks like you're confused about the GPIO pin.
SENSOR_SELECT_PIN should be 17 because that's what the ARM chip calls it. The fact that it is on pin 11 of the header is irrelevant to the program.
The next confusing thing is that GPIO17 on pin 11 of the header connects to pin 11 of the 4051.
If you want to see if the pin is working you can put an LED from pin 11 of the header to ground and see if it flashes when you run the program.
I had to run it as sudo because regular users don't have permission to access the GPIO pins.

Martin

On 2013-05-17 10:50, Julian Brooks wrote:

Sorry meant to attach the code (doh!).

My compadre has all the photo's on his phone so will give him a nudge
now and get back to you when I hear from him...

(hey George:)

Thanks for the testing tip - of course, seems so obvious now that you've
said it.

And I guess we can't definitely confirm that the pin switches although
the last big problem we had was that I'd set the switch to pin 17 rather
than pin 11 (gpio 17).  What would happen then is that we would get one
reading from the 1st sensor and then it would stall/quit-out.

More soon hopefully,

Julian


On 17 May 2013 15:14, Martin Peach <martin.peach@sympatico.ca

<mailto:martin.peach@sympatico.ca>> wrote:

    On 2013-05-17 09:39, Julian Brooks wrote:

        Hey Martin,

        Can I please peck your head hopefully one last time?


    Sure.


        We're so close, got the hardware for the installation up and
        running,
        box made etc etc.

        Could you have a once-over of our code:
        Still only seeing one sensor though all of our multimeter
        testing says
        sensor 2 is fine and ready to go.  I think it has to be a code
        problem
        in the C file but I just_can't\-see\-it!!


    You need to show me your code... The file I sent was to read two
    sensors. The second was the 1X8 sensor so it reads a different
    number of bytes. You have to change that, everything else should be
    the same..



        Keep wondering if there's a way of being able to test the 2nd
        sensor in
        a similar vein to sensor 1 with 'i2cdetect', like if we could
        shift the
        IC switcher so it would allow us to run the test on the 2nd one.


    Yes, just connect the A select line of the 4051 (pin 11) directly to
    3.3V or ground to select one or the other. But disconnect the GPIO
    pin when you do that.



        Pd is receiving on both sends (44l & 44l2) but all we have is one
        sensors readings - same in the prints from the C file.


    Sounds like the multiplexer isn't working right. Do you have a photo
    of your setup? Can you confirm that the GPIO pin switches?

    Martin

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