Homebrewkeyboard

gfoot·homebrewkeyboard·keyboard_vero2/keyboard_vero2.kicad_pcb

Homebrewkeyboard PCB layout, top view — open source board by gfoot

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About the Homebrewkeyboard PCB

Homebrewkeyboard is an open source PCB design by gfoot, published on GitHub under the Unlicense license. It is a 1-layer board measuring 162.6 × 99.1 mm, with 85 components from 7 distinct parts.

Other key parts include the 74LS138 and 74LS374. By type, the board carries 64 switches, 8 diodes, 8 resistors, 2 ICs and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

Schematics, board layouts, and code for adding a homebrew keyboard to your electronics projects

Schematics, board layouts, and code for adding a homebrew keyboard to your electronics projects

This one uses a parallel interface, ideal for connecting directly to the address and data bus of something like a 6502.

I also have one with a serial interface, more tailored for Arduino - let me know if you're interested and I'll publish it as a separate project.

8x resistor, 10k or thereabouts 8x diode, e.g. 1N4007 66x 4-pin push-switch with 5.08mmx5.08mm (0.2") pin pitch 1x 74LS138 address decoder 1x 74LS374 8-bit latch/register with tri-state outputs 1x 15-pin header for connecting wires…

Homebrewkeyboard, from the project README — From the project README

Main components on the Homebrewkeyboard

74LS138 74LS374

Homebrewkeyboard bill of materials (BOM)

85 components, 7 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	74LS138	DIP-16_W7.62mm	U1
1	74LS374	DIP-20_W7.62mm	U2
1	CONN_01X15_MALE Conn_01x15_Male	PinHeader_1x15_P2.54mm_Horizontal	J1
64	SW_PUSH_45DEG SW_Push_45deg	SW_PUSH_6mm	SW0, SW1, SW2, SW3, SW4, SW5, SW6, SW7 +56
2	SW_PUSH_45DEG SW_Push_45deg	SW_PUSH_6mm	SWX1, SWX3
8	1K	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D3, D4, D5, D6, D7, D8
8	10K	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R1, R2, R3, R4, R5, R6, R7, R8

Homebrewkeyboard design files

The KiCad project lives in the gfoot/homebrewkeyboard repository on GitHub; these links point at the commit this page was built from.

Homebrewkeyboard: common questions

How big is the Homebrewkeyboard PCB?

The Homebrewkeyboard measures 162.6 × 99.1 mm, has 1 copper layer and is 1.6 mm thick.

How many components are on the Homebrewkeyboard?

85 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Homebrewkeyboard design files?

From the gfoot/homebrewkeyboard repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Homebrewkeyboard design in my own project?

Yes, under the terms of its Unlicense license, which gfoot chose for the repository.

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