Arduino 4x3 hot-swappable keypad

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STD Arduino 4x3 hot-swappable keypad

Arduino

Consumer_Electronics

License: Public Domain

Mode:

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Update time： 2021-10-10 14:38:27

Creation time： 2021-05-27 02:10:44

Description

- swappable Arduino nano
- ws2812b addressable per-key RGB lighting
- hot-swappable switches

source code: https://github.com/Alan72104/Arduino4x3keypad

- due to external swappable arduino board, the total height will be kinda big, can be directly soldered on though, the 5v pin need to be manually soldered on using jumper wires

- because of the usage of arduino nano (can't be connected as a USB HID hardware), an external software is required to receive the keypad messages and tell the computer keypresses, the driver and GUI written in Autoit is available for download (https://github.com/Alan72104/KeypadDriver)

acrylic case schematic is also available

Design Drawing

schematic diagram

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schemetic
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PCB

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PCB_4x3 Keypad
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PCB_4x3 Keypad v1.5
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PCB_4x3 Keypad v2
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	KAILH MX SOCKET 1U	SW1,SW2,SW3,SW4,SW8,SW7,SW6,SW5,SW12,SW11,SW10,SW9	SW_CHERRY_MX1A_1.00_SOCKET	12
2	WS2812B	LED1,LED2,LED3,LED4,LED8,LED7,LED6,LED5,LED12,LED11,LED10,LED9	WS2812B	12
3	1N4148	D1,D5,D9,D10,D6,D2,D3,D4,D7,D11,D12,D8	DO-35_BD2.0-L4.0-P8.00-D0.5-FD	12
4	arduino_nano_lib_unusedpinsremoved	U1	ARDUINO_NANO_UNUSEDPINSREMOVED	1