First I'd like to apologize if I shouldn't have necro'd a thread from over a year ago, but I wasn't sure if this post warranted a new topic. I've tried my best to follow this thread through in my course of building a GHpad.
I am still looking for a case for the thing since TaoBao was out of stock for the nice acrylic cases. I was curious if anyone had CAD models for either a 2-piece plate case (like the one JDCarpe made for TheChemist
https://geekhack.org/index.php?topic=38963.msg1324791#msg1324791) or the multi-piece acrylic that MOZ made (
https://geekhack.org/index.php?topic=38963.msg1167300#msg1167300); I'd also be interested in potentially buying one if available.
Recently I bought a GHpad board from TaoBao called "AMJ Pad". It looks like a modified version of regack's board with resistor positions for optional LEDs at every switch position as well as additional LED positions around the perimeter of the board. I wanted to get your knowledgeable opinions before I assume these to be true, and I also had a few questions.
The boards can be seen here:
Below I've labeled a few positions on the board I had a question about:
- On the bottom side of the board there's a switch labeled "REST" (on the reverse). This seems to be the same switch seen at the top center of the regack design - what is this switch for?
- There's a SMD solder point below the switch called "LED", anyone know what the LED might be for?
- There's two sets of Through-hole solder points labeled R1-R5 and C1-C4 in the highlighted markings "Unknown Pins #2 and #3". I'm assuming these are the row and column break outs mentioned by JDCarpe a few posts up.
- On the top side there's a set of 6 through hole solder points for "MOSI SCK" in the box "Unknown Pins #1". Not sure what those are for either
Just to recap what I am currently assuming:
There's 24 switch positions on this board since it's basically the 6x4 layout by regack complete with the sort of breakaway bottom row. Each key position has a diode SMD solder point designated by D1-D24. Diodes are required for key operation. I'm doing a 21-key config so I only need to solder diodes for the relevant switches. I will probably solder all 24 on, since I have no idea which diode corresponds to which switch position.
Additionally each switch position has a resistor solder point for optional LEDs on switches in positions RL1-24. If I don't have an LED on a switch, the resistor is optional. Resistor sizing depends on the LED voltage needed.
There are 15 LED positions on the perimeter of the board. Each position has 4 solder pads, 2 for the resistor, 2 for the LED. I have no idea if the resistor goes first or the LED. I have no idea what orientation the polarity is for those solder points for the LEDs. The solder mask is slightly more bulbous on one side, maybe this means something.
Everything above is stated as my interpretation, not fact; please correct me if I'm wrong!
Thank you very much for reading.
Regards,
breh