Some issues with non functioning pins.

[Jhenox]

Hello. I recently purchased the stereo sound card and I have it mounted on top of a Raspberry Pi 3. I then have a ribbon cable off the top of the sound card to a GPIO breakout board for testing. The problem is that some pins no longer seem to function that are not listed as being used by the sound card. I have read the documentation about the pins that are used (viewtopic.php?f=5&t=4&sid=257811342facc ... 7dc8ad1182). I have been careful not to use pins 3, 5, 12, 35, or 40. Some examples of non functioning GPIO pins are 13 (GPIO 2) and 15 (GPIO 3). There are others that I have run into as well. I haven't tested all of the power pins but I couldn't seem to get 5v anymore on pin 2. Am I doing something wrong? Thank you. Your input is appreciated.

[flatmax]

Hi there,

The card also uses the 5V line (pins 2 and 4) as well as pin 17 (3.3V).

I just setup a system using a ribbon cable on the weekend (see here). Didn't run into any problems.

Can we confirm that you aren't talking about the Octo card and you are talking about the stereo card ?

thanks
Matt

[Jhenox]

Hello. Yes, it is the stereo sound card. I pulled everything off the bread board and tested each of the GPIO pins individually and everything checks out. I only found one pin that was acting up; WPi 4/HW 16. It could be the breadboard, the cable, or I might have even damaged it.

Command HW Result
gpio​ ​blink​ ​1 12 SSC​ ​Bit​ ​clock
gpio​ ​blink​ ​2 13 OK
gpio​ ​blink​ ​3 15 OK
gpio​ ​blink​ ​4 16 NOK
gpio​ ​blink​ ​5 18 OK
gpio​ ​blink​ ​6 22 OK
gpio​ ​blink​ ​7 7 OK
gpio​ ​blink​ ​8 3 SSC​ ​I2C
gpio​ ​blink​ ​9 5 SSC​ ​I2C
gpio​ ​blink​ ​10 24 OK
gpio​ ​blink​ ​11 26 OK
gpio​ ​blink​ ​12 19 OK
gpio​ ​blink​ ​13 21 OK
gpio​ ​blink​ ​14 23 OK
gpio​ ​blink​ ​15 8 OK
gpio​ ​blink​ ​16 10 OK
gpio​ ​blink​ ​21 29 OK
gpio​ ​blink​ ​22 31 OK
gpio​ ​blink​ ​23 33 OK
gpio​ ​blink​ ​24 35 SSC​ ​LR​ ​clock
gpio​ ​blink​ ​25 37 OK
gpio​ ​blink​ ​26 32 OK
gpio​ ​blink​ ​27 36 OK
gpio​ ​blink​ ​28 38 SSC​ ​Data​ ​in
gpio​ ​blink​ ​29 40 SSC​ ​Data​ ​out
gpio​ ​blink​ ​30 27 OK

Thank you for all your help!

[flatmax]

No worries !

Care to share your project here ? What are you up to ?
Matt

[Jhenox]

Hi, Matt. Actually, i'll start another thread about that because i'm having some problems with it that hopefully you can help with.

[IrwinAllen13]

Hey Everyone,

I have found the same thing over here.

I am building a dual mono audio recorder with GPIO dry contact closures. The idea is when I bring an input to high, the audio injector would play out audio and record in the Left or right depending on what input was brought to high. I got the inputs, recording, and playback working just fine. However, I can't seem to get any voltage out a few GPIO outputs. The GPIO out works just fine without the stereo injector, but when the stereo injector is attached the following pins won't work.

32
33
36

I have tried a different breadboard, and I get the same results. As well as a different ribbon cable.

I have tripled checked my voltage outputs, and current flow. I know I am drawing roughly 7.5 mA per LED.

Any thoughts on what is going on?

[flatmax]

The audio injector cards don't make any physical connections with those pins {32, 33, 36} - they are literally dangling from the Pi.

I would imagine that the problem is something to do with software on the Pi ?

I did the following test on pin 32;

First get access to GPIO 12 as an output

Code: Select all

echo "12" > /sys/class/gpio/export 
echo "out" > /sys/class/gpio/gpio12/direction

Set it low :

Code: Select all

echo "0" > /sys/class/gpio/gpio12/value

Set it high :

Code: Select all

echo "1" > /sys/class/gpio/gpio12/value

I could measure low and high on that pin.

Matt