Pi Cobbler

Moderators: adafruit_support_bill, adafruit

Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Locked
User avatar
gainestr
 
Posts: 7
Joined: Mon Sep 24, 2012 10:26 pm

Pi Cobbler

Post by gainestr »

After purchasing the Pi Cobbler (PID: 914) I have noticed that it has a lot of noise in the cable. I am not able to get good input readings when using the Pi Cobbler. My PIR sensor (PID: 189) that I have purchased from you does not register effectively when using the cobbler. If I touch the wires with my finger, it will trip my input reading. I believe that the cable is not properly shielded and when viewing the all I/O pins using a python script that I created, I can see that pins will jump from a high to low state on their own. When the cable is disconnected, everything reads fine. I have rechecked all of my solder joints and can not find anything even remotely close to being an issue. Again, I feel that it is a shielding issue. Any suggestions?

adafruit
 
Posts: 12151
Joined: Thu Apr 06, 2006 4:21 pm

Re: Pi Cobbler

Post by adafruit »

do you have pullups installed?

User avatar
gainestr
 
Posts: 7
Joined: Mon Sep 24, 2012 10:26 pm

Re: Pi Cobbler

Post by gainestr »

Yes, Pull up resisters are installed. I have even tried GPIO 8 (BCM 0) which has a 1K8 pull up on board. Even without anything plugged into my bread board except the Pi Cobbler, I encounter issues.

adafruit
 
Posts: 12151
Joined: Thu Apr 06, 2006 4:21 pm

Re: Pi Cobbler

Post by adafruit »

The cobbler is just wires - and we've never heard of this issue - it could be something with your wiring. Replacing the cobbler is unlikely to solve your problem :/

User avatar
gainestr
 
Posts: 7
Joined: Mon Sep 24, 2012 10:26 pm

Re: Pi Cobbler

Post by gainestr »

Yea, I don't really think its the cobbler myself. I think that its either a bad connection on one end of the cable or a short in the cable itself. There is definitely some bleed over in the cable, that is for sure. I guess I'll have to look for a higher quality cable then the one you provide. But I guess that if I'm the only one with this issue then it must be an anomaly.

User avatar
gainestr
 
Posts: 7
Joined: Mon Sep 24, 2012 10:26 pm

Re: Pi Cobbler

Post by gainestr »

Looks like I'm not the only one with cable issues after all.

flaneur
 
Posts: 16
Joined: Mon Nov 05, 2012 11:36 pm

Re: Pi Cobbler

Post by flaneur »

I'm also having a confusing time with my cable. I don't think it's the soldering of the cobbler piece itself. I've found I have to touch the ribbon to get it to give non-zero values back to the Python GPIO example. At first I thought that the Cobbler wasn't seated correctly in the breadboard, or the ribbon wasn't seated correctly in the Cobbler or Pi itself, but I'm pretty confident this isn't the case.

Even the gentlest of touches of the ribbon can provoke it to produce non-zero values, but moving the cable in various ways by holding the Pi with one hand and the breadboard with the other will not produce a value.

adafruit
 
Posts: 12151
Joined: Thu Apr 06, 2006 4:21 pm

Re: Pi Cobbler

Post by adafruit »

post up a clear photo of the project & wiring - we can take a look

Locked
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/

Return to “Adafruit Raspberry Pi® accessories”