[PD] Sensors GPIO Raspberry Pi Pd

[Julian Brooks]

Aargh - you're right, I am confused (so very)...

So, to be clear
#define SENSOR_SELECT_PIN 11
should be
#define SENSOR_SELECT_PIN 17
After all?

It is then going to pin 11 on the 4051.

Running as root so need for sudo (yes I know)

As Max Romeo said:
"One step forwards, two steps backwards" :)

J

Will try the led test and the updated code when I can get back to it in a
couple of days or so.


On 17 May 2013 16:20, Martin Peach <martin.peach at sympatico.ca> wrote:

> 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 at sympatico.ca
>> <mailto:martin.peach@**sympatico.ca <martin.peach at 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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>
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