HardLabs

Keyboard MKI

hsaito18·mini-keyboard·mini-keyboard MKI/keyboard MKI.kicad_pcb

Keyboard MKI PCB layout, top view — open source AVR/Arduino board by hsaito18

About the Keyboard MKI PCB

Keyboard MKI is an open source AVR/Arduino PCB design by hsaito18, published on GitHub. It is a 2-layer board measuring 79 × 102.5 mm, with 48 components from 17 distinct parts.

Its main chip is the C85364, from the AVR/Arduino family. By type, the board carries 16 relays, 16 diodes, 8 capacitors, 4 resistors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Building a 4x4 macro keyboard using left-over Cherry MX Red key switches and left-over keycaps. Will use AT90USB1286 microcontroller, since the typical ATMega microcontroller is unavailable.

Main components on the Keyboard MKI

C85364

Keyboard MKI bill of materials (BOM)

48 components, 17 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C85364
AT90USB1286-AU
U1
1
XTAL_GND
X1
1
C160404
USB_C_Receptacle_USB2.0
J1
16
KEYSW
K1, K2, K3, K4, K5, K6, K7, K8 +8
1
C318884
SW_PUSH
SW1
16
C81598
D
D1, D2, D3, D4, D5, D6, D7, D8 +8
2
C49678
22p
C1, C2
1
C49678
0.1u
C3
1
C15850
0.1u
C4
1
C1804
0.1u
C5
1
C28323
0.1u
C6
1
C1804
4.7u
C7
1
1u
C8
1
C17561
10k
R1
1
C17561
5.1k
R2
1
C17414
5.1k
R3
1
C17414
10k
R4

Keyboard MKI design files

The KiCad project lives in the hsaito18/mini-keyboard repository on GitHub; these links point at the commit this page was built from.

Keyboard MKI: common questions

What microcontroller does the Keyboard MKI use?

The Keyboard MKI is built around the C85364, from the AVR/Arduino family.

How big is the Keyboard MKI PCB?

The Keyboard MKI measures 79 × 102.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keyboard MKI?

48 components, from 17 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 Keyboard MKI design files?

From the hsaito18/mini-keyboard repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Keyboard MKI design in my own project?

The repository has no license, so all rights stay with hsaito18. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Keyboard MKI without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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