Custom keyboard v2 - Thumb cluster prototype iterations, done

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@@ -189,7 +189,7 @@ I should have cut more corners, to test the core concept, before spending time,
 
 Using this tutorial:
 [makerhacks.com ─ Use the MCP23017 GPIO Port Expander to Add 16 IO Pins](https://www.makerhacks.com/mcp23017/)
-i was able to make the [MicroPython](https://en.wikipedia.org/wiki/MicroPython) example work, but issues arise. 
+i was able to make the [MicroPython](https://en.wikipedia.org/wiki/MicroPython) example work, but issues arise.
 It keeps throwing the exception: `[Errno 5] EIO`, furthermore `i2c.scan()` is not consistent with what it returns.
 All this is despite forgoing the breadboard, in favor of directly soldered connections :/
 
@@ -228,11 +228,11 @@ while 1:
 > [github.com ─ dhylands / rshell](https://github.com/dhylands/rshell) Can be used to make it easier, to work
 > with [MicroPython](https://en.wikipedia.org/wiki/MicroPython)
 
-The issues persisted, and i decided to move from MicroPython to C++ using the 
+The issues persisted, and i decided to move from MicroPython to C++ using the
 [Adafruit library](https://github.com/adafruit/Adafruit─MCP23017─Arduino─Library)
 And since the [github.com ─ earlephilhower/arduino─pico](https://github.com/earlephilhower/arduino─pico) functions
 [`bool SetSDA` and `bool SetSCL`](https://arduino─pico.readthedocs.io/en/latest/wire.html)
-didn't work to change I²C 0 pins, 
+didn't work to change I²C 0 pins,
 i change to the default pins `GP4` for `SDA` and `GP4` for `SCL` denoted by the Raspberry PI Pico pinout.
 
 ![Raspberry Pi Pico pinout](https://www.raspberrypi.com/documentation/microcontrollers/images/pico-pinout.svg)
@@ -241,7 +241,7 @@ Still the issues persisted, still working sporadically for a bit, and then stopp
 I then tried using pull─up resistors with a value of `4.7KΩ`. Still didn't work consistently.
 I then searched around, and came across this forum post:
 [forum.arduino.cc ─ Problems with MCP23017 ─ Solved](https://forum.arduino.cc/t/problems─with─mcp23017─solved/21997)
-And i followed the wiring described therein. Namely, tie `A0`, `A1` and `A2` to ground, 
+And i followed the wiring described therein. Namely, tie `A0`, `A1` and `A2` to ground,
 `Reset` to `3.3v` using a `1KΩ` pull-up resistor, and finally tie `SDA` and `SCL` to 3.3v using a `1KΩ` pull-up resistor
 (see the following ascii art diagram)
 
@@ -314,4 +314,12 @@ void loop() {
 	mcp.digitalWrite(LED_PIN, LOW);
 	delay(250);
 }
-```
\ No newline at end of file
+```
+
+## Thumb cluster prototype iterations
+
+I've iterated on the thumb cluster design (based on the amazing work by the [Dygma Defy](https://dygma.com/pages/defy) team) 
+and I've reached a design that works for me.
+
+![Thumb cluster CAD based on Dygma Defy](Thumb cluster CAD based on Dygma Defy.png)
+![Thumb cluster itterations](Thumb cluster itterations.jpg)
\ No newline at end of file