HardLabs

Calcite52 Keyboard

siderakb·calcite·Calcite52/pcb/Calcite52.kicad_pcb

Calcite52 Keyboard PCB layout, top view — open source RP2040/RP2350 board by siderakb

About the Calcite52 Keyboard PCB

Calcite52 Keyboard is an open source RP2040/RP2350 PCB design by siderakb, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 231.1 × 97.8 mm, with 140 components from 20 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the RT9013-33GB, SRV05-4 and W25Q128JVS. By type, the board carries 52 diodes, 16 capacitors, 9 resistors, 4 ICs, 2 switches and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

60/52 keys Kailh Choc V1 low profile switches ortho keyboard

- 52 keys ortho keyboard. - Kailh Choc V1 low profile switches (PG1350). - USB Type-C with ESD protection and resettable fuse. - RP2040 ARM MCU, 16MB external flash. - One configurable monochrome LED indicator. - M2 screw mounting holes. - USB D+/- pads for debugging. - Powered by QMK firmware. - Support Vial, edit keymap and configure keyboard in real time. - JLCPCB's PCBA service available.

Calcite52 Keyboard, from the project README
From the project README

Main components on the Calcite52 Keyboard

RT9013-33GBSRV05-4W25Q128JVSRP2040

Calcite52 Keyboard bill of materials (BOM)

140 components, 20 distinct parts.

QtyPartRefs
1
RT9013-33GB
U1
1
SRV05-4
U2
1
W25Q128JVS
U3
1
RP2040
U4
1
12MHz
Y1
1
USB_C_Receptacle_USB2.0
J1
1
500mA, 6V
F1
52
SW_Push_45deg
KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7, KEY8 +44
1
SolderJumper_2_Open
SB1
1
BOOT
SW1
1
RESET
SW2
1
Blue
LD1
52
1N4148
D1, D2, D3, D4, D5, D6, D7, D8 +44
4
1uF
C1, C2, C8, C16
10
100nF
C3, C6, C7, C9, C10, C11, C12, C13 +2
2
20pF
C4, C5
2
5.1k
R1, R2
3
1k
R3, R6, R8
2
27
R4, R5
2
10k
R7, R9

Calcite52 Keyboard design files

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

Calcite52 Keyboard: common questions

What microcontroller does the Calcite52 Keyboard use?

The Calcite52 Keyboard is built around the RP2040, from the RP2040/RP2350 family.

How big is the Calcite52 Keyboard PCB?

The Calcite52 Keyboard measures 231.1 × 97.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Calcite52 Keyboard?

140 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Calcite52 Keyboard design files?

From the siderakb/calcite repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Calcite52 Keyboard design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which siderakb chose for the repository.

Can I test firmware for the Calcite52 Keyboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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