4x6

4x6 or 4x5 Keypad

Based on GH60 Rev B

v0.12.1

• cleaned up silkscreen some more after receiving pcbwing prototypes...

v0.10-0.12

• cleaned up silkscreen to make everything visible
• fixed not-connected pads (oops)
• fixed BOM entries for items
• fixed diode pads to work with SOD-123 package
• extended USB pads for easier soldering
• added support for MCP23018 serial IO expander
• other stuff I probably forgot since I'm bad at checking stuff in

MATRIX (ATMEGA)

• ROW1 = PD0 / pin 18

• ROW2 = PD1 / pin 19

• ROW3 = PD2 / pin 20

• ROW4 = PD3 / pin 21

• ROW5 = PD4 / pin 25

• ROW6 = PD5 / pin 22

• COL1 = PF0 / pin 41

• COL2 = PF1 / pin 40

• COL3 = PE6 / pin 1

• COL4 = PC7 / pin 32

MATRIX (MCP23018)

• ROW1 = GPB5 / pin 7

• ROW2 = GPB4 / pin 6

• ROW3 = GPB3 / pin 5

• ROW4 = GPB2 / pin 4

• ROW5 = GPB1 / pin 3

• ROW6 = GPB0 / pin 2

• COL1 = GPA0 / pin 17

• COL2 = GPA1 / pin 18

• COL3 = GPA2 / pin 19

• COL4 = GPA3 / pin 20

LEDs

• NUMLOCK = PB2 / pin 10
• DF1 = PF7 / pin 36
• DF2 = PF6 / pin 37
• DF3 = PF5 / pin 38

v0.9

• cleaned up silkscreens and added notes
• rotated S51 and S21
• added mounting holes (5)
• minor placement tweaks

v0.8

• 1.27mm headers on left-board edge for ROWS, COLUMNS, Vcc, GND and Fn/NumLock LED control line
• silkscreen on back for headers
• geekhack silkscreen
• adjusted spacing of breakaway drill holes
• still need to fix pad interference of S5 and S21
• might ditch mounting slot on left-edge of board

v0.5

• Cleaned up silkscreen text and locations

v0.4

• Added additional 'breakaway' holes
• Fixed S51 and S21 drill hole collisions (rotate 180)
• Added slotted mouting holes in center of board
• Aligned 'reset' switch properly
• Cleaned up measurement lines
• Cleaned up top and bottom ground zones

v0.3

• Includes additional key positions and working on breakaway bottom row
• Added 'breakaway' holes for easier removal of the bottom row