Goldtouch Keypad Lobotomy

[IBNobody]

I wanted a Macro Keypad, but I didn't want to design a case and a plate from scratch. Instead, I bought a used Goldtouch GTC-MACB 23-key Keypad from eBay and gave it a lobotomy.

See here for an album of my pictures.

http://imgur.com/a/kstZs

I went beyond a simple lobotomy by replacing the switch matrix. But... It's definitely possible to replace the Cypress cy763813 with a Teensy. You'd just need to rewrite your TMK matrix.c routines to handle the weird matrix and live with a 3KRO.

For reference, here is the original switch matrix...

More

Format:

<Chip Ref Des> pin <Pin #>
<Keycap Name> (Silkscreen Name if different) - <Switch Pin #>


Note:
U2 pin 2 is the Num Lock LED and is  active low.

U2 pin 1
Clear (Num Lock) - 1
Enter - 2
Esc (ESC) - 2


U2 pin 3
- - 1

U2 pin 4
7 - 2
8 - 2
9 - 2

U2 pin 5
* - 2
Delete (BACK SPACE) -  2

U2 pin 6
1 - 2
0 - 2
. - 2
, - 2

U2 pin 7
4 - 2
5 - 2
6 - 2

U2 pin 8
Tab - 2
= (/) - 2

U2 pin 13
Delete (BACK SPACE) -  1
9 - 1
6 - 1
3 - 1
. - 1

U2 pin 14
Tab - 1
8 - 1
5 - 1
2 - 1
0 - 1

U2 pin 15
Esc (ESC) - 1
= (/) - 1
/ (*) - 1
7 - 1
4 - 1
1 - 1
+ - 1

U2 pin 16
Enter - 1
* (<--) - 1
, - 1

U2 pin 17
Fn (#NAME?) - 1
- - 2
Clear (Num Lock) - 2

U2 pin 18
Fn (#NAME?) - 2
* (<--) - 2
+ - 2
3 - 2
2 - 2

[rowdy]

Excellent use of the Enablers!

[IBNobody]

Excellent use of the Enablers!

Thanks! I shiver at the thought at how much wiring I'd have to do without them. It was pretty much plug-and-play since I had a box of pre-cut protoboard jumpers.

[geniekid]

I like this mod!  I am inspired.

[IBNobody]

Here is the final product. I was able to get backlighting working and have 16 brightness steps. I chose warm white LEDs because I like how they look like incandescent bulbs.

I'm reusing my K95 G-keys for this until I get a better keyset.