HardLabs

RMK-left

KarlPeter5039·RMK-final·PCB Misc/RMK-left.kicad_pcb

RMK-left PCB layout, top view — open source AVR/Arduino board by KarlPeter5039

About the RMK-left PCB

RMK-left is an open source AVR/Arduino PCB design by KarlPeter5039, published on GitHub. It is a 2-layer board measuring 160 × 127 mm, with 65 components from 12 distinct parts.

Its main chip is the ProMicro, from the AVR/Arduino family. Other key parts include the 4PIN. By type, the board carries 29 switches, 29 diodes, 2 ICs and 2 resistors.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

Final iteration of the Reconfigurable Mechanical Keyboard including firmware and PCB files

Developed at Lehigh University for ECE 258 by Sumin Lim '23 and Karl Peter '23

While there have been many designs for modular keyboards, nothing out there really comes close to the practicality of our design. It will be different from generic commercial designs by adding additional peripherals including rotary encoders for analog input, a fully modular set up, and dedicated keyboard portions that can be connected and disconnected at any time.

RMK-left, from the project README
From the project README

Main components on the RMK-left

ProMicro4PIN

RMK-left bill of materials (BOM)

65 components, 12 distinct parts.

QtyPartRefs
1
ProMicro
U1
1
4PIN
U2
1
RotaryEncoder
ROT1
1
R_Potentiometer
RV1
22
KEYSW
SW1, SW6, SW7, SW8, SW9, SW11, SW12, SW13 +14
1
KEYSW
SW2
1
KEYSW
SW3
2
KEYSW
SW4, SW20
3
KEYSW
SW5, SW10, SW15
1
SW_PUSH
SW_A1
29
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +21
2
4.7k
R1, R2

RMK-left design files

The KiCad project lives in the KarlPeter5039/RMK-final repository on GitHub; these links point at the commit this page was built from.

RMK-left: common questions

What microcontroller does the RMK-left use?

The RMK-left is built around the ProMicro, from the AVR/Arduino family.

How big is the RMK-left PCB?

The RMK-left measures 160 × 127 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RMK-left?

65 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the RMK-left design files?

From the KarlPeter5039/RMK-final repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the RMK-left design in my own project?

The repository has no license, so all rights stay with KarlPeter5039. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the RMK-left 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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