HardLabs

Mini-Keyboard MKII

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

Mini-Keyboard MKII PCB layout, top view — open source AVR/Arduino board by hsaito18

About the Mini-Keyboard MKII PCB

Mini-Keyboard MKII 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 51 components from 19 distinct parts.

Its main chip is the C85364, from the AVR/Arduino family. By type, the board carries 16 relays, 16 diodes, 8 capacitors, 6 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 Mini-Keyboard MKII

C85364

Mini-Keyboard MKII bill of materials (BOM)

51 components, 19 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
1
C70076
500mA
F1
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
2
22
R5, R6

Mini-Keyboard MKII 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.

Mini-Keyboard MKII: common questions

What microcontroller does the Mini-Keyboard MKII use?

The Mini-Keyboard MKII is built around the C85364, from the AVR/Arduino family.

How big is the Mini-Keyboard MKII PCB?

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

How many components are on the Mini-Keyboard MKII?

51 components, from 19 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 Mini-Keyboard MKII 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 Mini-Keyboard MKII 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 Mini-Keyboard MKII 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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