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Settle the numpad layout: 25 keys, no encoder

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Nav block across the top with an isolated inverted-T below it, operators in a
right-hand column beside 9/6/3 where a numpad puts them, and a 2u Enter plus
+ on a stepped thumb cluster spanning the three nav columns. Six by five,
~114 x 105 mm.

The volume encoder is dropped, which makes this a completely plain QMK
keyboard - no encoder, no pointing device, no consumer control. Firmware notes
and BOM updated; the numpad board is now ~$4.11 in parts.

Co-Authored-By: Claude Opus 5 <[email protected]>
This commit is contained in:
William RickertandClaude Opus 5 committed 2026-09-01 08:59:04 -05:00
1 parent e555e802e1
commit 81abd43fdc
3 files changed
+75 -72
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Documents/bom.csv
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@@ -23,8 +23,7 @@ HALF-L/R,Split,D-ESD,1,ESD 5V bidirectional,PESD5V0S1BA,C2827694,SOD-323,Extende
HALF-L/R,Split,J3,1,3-pin header DNF,JST SH,-,-,Consigned,0.02,"*** DNF INSURANCE *** VCC/GND/DATA fallback if SBU proves flaky (bad cables). 3 pads cost nothing"
HALF-L/R,Split,-,-,SBU1+SBU2 TIE,-,-,-,-,0.00,"Tie A8 and B8 together on the board. SBU is CROSSED in the cable, so this makes it orientation-proof and doubles the conductor"
NUMPAD,DNF,J1/U3/R3/R4/R5,0,DO NOT POPULATE,-,-,-,-,0.00,"*** From the ALL block: numpad MCU has NO connector of its own. Its D+/D- route internally to hub downstream port 1. No connector = no ESD part and no CC resistors needed. Saves ~$0.19"
NUMPAD,Matrix,D1-D25,25,1N4148W,1N4148W,C81598,SOD-123,Basic,0.011,"25 keys: 16 numpad (no Num key) + 9 nav"
NUMPAD,Encoder,ENC1,1,EC11 detented,EC11L1525G01,C2991196,THT,Extended,1.27,"VOLUME - detented, which is what a stock EC11 already is. Occupies a 2u cell so a full-size knob fits. THT: hand-solder or JLC THT surcharge"
NUMPAD,Matrix,D1-D25,25,1N4148W,1N4148W,C81598,SOD-123,Basic,0.011,"25 keys: 14 numpad + 9 nav + 2 thumb (Enter 2u, +). No Num key"
NUMPAD,Hub,U4,1,USB2.0 4-port hub,CH334R,C4154405,QSOP-16-150mil,Extended,0.50,"Ports: 1=own MCU (internal FS) 2=left half 3=right half 4=spare"
NUMPAD,Hub,Y2,1,12MHz crystal,X322512MSB4SI,C9002,SMD3225-4P,Basic,0.101,"CH334 has built-in load caps - verify internal value vs this 20pF CL crystal; fit DNF cap pads"
NUMPAD,Hub,C12-C14,3,100nF 0402,CL05B104KO5NNNC,C1525,0402,Basic,0.006,"hub decoupling"
1 Board Section Ref Qty Value MPN LCSC Package JLC Unit USD Notes
23 HALF-L/R Split J3 1 3-pin header DNF JST SH - - Consigned 0.02 *** DNF INSURANCE *** VCC/GND/DATA fallback if SBU proves flaky (bad cables). 3 pads cost nothing
24 HALF-L/R Split - - SBU1+SBU2 TIE - - - - 0.00 Tie A8 and B8 together on the board. SBU is CROSSED in the cable, so this makes it orientation-proof and doubles the conductor
25 NUMPAD DNF J1/U3/R3/R4/R5 0 DO NOT POPULATE - - - - 0.00 *** From the ALL block: numpad MCU has NO connector of its own. Its D+/D- route internally to hub downstream port 1. No connector = no ESD part and no CC resistors needed. Saves ~$0.19
26 NUMPAD Matrix D1-D25 25 1N4148W 1N4148W C81598 SOD-123 Basic 0.011 25 keys: 16 numpad (no Num key) + 9 nav 25 keys: 14 numpad + 9 nav + 2 thumb (Enter 2u, +). No Num key
NUMPAD Encoder ENC1 1 EC11 detented EC11L1525G01 C2991196 THT Extended 1.27 VOLUME - detented, which is what a stock EC11 already is. Occupies a 2u cell so a full-size knob fits. THT: hand-solder or JLC THT surcharge
27 NUMPAD Hub U4 1 USB2.0 4-port hub CH334R C4154405 QSOP-16-150mil Extended 0.50 Ports: 1=own MCU (internal FS) 2=left half 3=right half 4=spare
28 NUMPAD Hub Y2 1 12MHz crystal X322512MSB4SI C9002 SMD3225-4P Basic 0.101 CH334 has built-in load caps - verify internal value vs this 20pF CL crystal; fit DNF cap pads
29 NUMPAD Hub C12-C14 3 100nF 0402 CL05B104KO5NNNC C1525 0402 Basic 0.006 hub decoupling