geekhack
geekhack Projects => Making Stuff Together! => Topic started by: alisdair on Sat, 27 September 2014, 10:49:17
-
I'm having a problem with my Ergodox build that I don't know what to do about.
The first column of switches on the right board (SW5:7, 4:7, 2:7, and 0:7) all activate the entire corresponding row. For example, pressing SW5:7 also activates SW5:8, 5:9, 5:10, 5:11, 5:12, and 5:13.
I can't see how this can be happening. Looking at the circuit I can't imagine any fault with my build that would have caused this.
Does anyone have any ideas for what to do to fix this? What could be the cause?
Attached are a couple of pictures of the back of the board in case I'm missing something obvious:
(http://i.imgur.com/sG5rhUk.jpg)
(http://i.imgur.com/ouCnTEz.jpg)
-
A quick update on this: pin B0 (the cathode on the column causing the problems) appears to have a short to ground. I can't find a circuit diagram for the Ergodox anywhere but given that this is only true for this column, I guess it's the source of the problem.
I can't see where B0 could be shorted to ground, though. Any suggestions?
-
I can't find a circuit diagram for the Ergodox anywhere but given that this is only true for this column, I guess it's the source of the problem.
here are the gerbers:
http://ergodox.org/Downloads.aspx
If you need screenshots I can just grab a gerber viewer and screenshot it.
Glad you got it looked at. I had a similar problem with a trace I didn't cut enough grounding to my metal case.
-
FIXED. I am an idiot.
There was a bridge between the LED cathode and the diode cathode. I thought they were meant to be connected. Here's the culprit:
(http://i.imgur.com/YpRrGxX.jpg)
So, in summary:
* LED should not be connected to the diode
* If you have a key which causes the entire row to activate, you probably have a short on the cathode of the diodes in the column of the key
Time to enjoy my new keyboard :)