Update README for hardware revision 2

README.md

@@ -5,10 +5,19 @@ Custom ergonomic mechanical keyboard with low-profile (Choc) switches.
 ## Versions
 
 - **eepyBoard v1.0: Hardware revision 1**
-  - Mostly ortholinear layout with 13 columns
-  - Bottom row: two regular keys + four thumb keys (per side, symmetrical)
-  - Partial F-key row (Esc, F1-F8) and rotary encoder
-  - RP2040 controller board in upper right corner
+    - Mostly ortholinear layout with 13 columns (73 keys + rotary encoder)
+    - Bottom row: two regular keys + four thumb keys (per side, symmetrical)
+    - Partial F-key row (Esc, F1-F8) and rotary encoder
+    - RP2040 controller board in upper right corner
+
+- **eepyBoard v1.1: Hardware revision 2**
+    - Column staggered split layout (single board) with a total of 15 columns and 6 rows (88 keys + 2 rotary encoders)
+    - Each side has 7 columns by 5 rows (not counting function keys and arrow keys)
+    - Bottom row: three regular keys + four thumb keys on each side, and an additional centered thumb key
+    - Full F-key row (Esc, F1-F12)
+    - 4 arrow keys in the center
+    - 2 pressable rotary encoders (one in the center of the keyboard, one in the upper right)
+    - Compact RP2040 "Pico Mini" controller board in the center
 
 ## Repository structure
 
@@ -36,31 +45,35 @@ Copy the file to `kicad/eepyboard.kicad_pcb`.
 
 Open the file in KiCad (create a project if non exists yet). Finalize the PCB in KiCad.
 
-1. Run the Design Rules Checker. Check the errors. Most of them can be ignored/excluded.
+1. Round off the bottom corners of the board outline:
+    - Remove the bottom center line and the two small fillet arcs next to it.
+    - Select the two remaining bottom lines. Right click them and use "Shape Modification -> Extend Lines to Meet".
+    - Right click the two angled lines again. Use "Shape Modification -> Fillet Lines..." with a 200mm radius.
+2. Run the Design Rules Checker. Check the errors. Most of them can be ignored/excluded.
     - All "Footprint not found in libraries" can be ignored completely. This is due to how Ergogen generates the PCB.
-2. Add VCC and GND planes.
+3. Add VCC and GND planes.
     - Menu: `File -> Board Setup`
     - On "Physical Stackup", change the copper layer number to 4.
     - On "Board Editor Layers", change the type of `In1.Cu` and `In2.Cu` to "power plane".
     - NOTE: `In1.Cu` will be the VCC plane, `In2.Cu` will be a GND plane.
-3. Add filled zones to the VCC and GND planes.
+4. Add filled zones to the VCC and GND planes.
     - Select the `In1.Cu` layer.
     - Use the "Add a filled zone" tool and draw a rectangle that contains the entire board. Assign the zone to VCC.
     - Repeat the same process for the `In2.Cu` layer and assign the zone to GND.
     - The zones don't need to be filled just yet.
-4. Add another filled zone on the `B.Cu` layer and assign it to GND.
-5. Route all signal traces (no VCC or GND yet). Recommended order:
+5. Add another filled zone on the `B.Cu` layer and assign it to GND.
+6. Route all signal traces (no VCC or GND yet). Recommended order:
     - Matrix rows (on `B.Cu`)
     - Matrix columns (with vias on `F.Cu`)
     - NeoPixel data pins
     - Connect everything to the MCU.
-6. Route VCC traces.
+7. Route VCC traces.
     - Connect the VCC traces between the NeoPixel chips and the capacitors with a 0.750 mm track.
     - Place free-standing vias (Ctrl+Shift+V) in the middle of the just created VCC traces.
-7. Route GND traces.
+8. Route GND traces.
     - Draw short GND traces with a 0.750 mm track and a via at the end next to the GND pads of the NeoPixel chips.
-8. Fill all zones by pressing B. Make sure that all nets are routed.
-9. Run the Design Rules Checker and make sure there are no (relevant) violations.
+9. Fill all zones by pressing B. Make sure that all nets are routed.
+10. Run the Design Rules Checker and make sure there are no (relevant) violations.
 
 #### Export Gerber files