Kallisto

Fredrik-Reinholdsen·kallisto·electronics/kicad/Akula.kicad_pcb

About the Kallisto PCB

Kallisto is an open source RP2040/RP2350 PCB design by Fredrik-Reinholdsen, published on GitHub. It is a 2-layer board measuring 216.6 × 182 mm, with 218 components from 13 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the AT24C256C-SSHL-T and TXB0102DCU. By type, the board carries 84 diodes, 59 capacitors, 46 switches, 19 resistors, 6 ICs and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

An ergonomic split keyboard with custom electronics and firmware.

A custom split keyboard, with custom electronics and firmware.

The hardware is based around a variant of the Raspberry Pi Pico board, and the RP2040 microcontroller. The keyboard features:

- 42 Kailh 1350 mechanical keyswitches (21 per half), 4 extra buttons and one rotary encoder. - Fully programmable key-map were any key can be mapped to any key/media function. - Key-map Layers - Custom RGB lighting with adjustable brightness - Onboard flash memory that hold the key-map.

Main components on the Kallisto

Pico AT24C256C-SSHL-T TXB0102DCU

Kallisto bill of materials (BOM)

218 components, 13 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
2	Pico	RPi_Pico_SMD_TH	U101, U201
2	AT24C256C-SSHL-T	SOIC-8_3.9x4.9mm_P1.27mm	U102, U202
2	TXB0102DCU	VSSOP-8_2.4x2.1mm_P0.5mm	U103, U203
2	AUDIOJACK4 AudioJack4	Jack_3.5mm_PJ320D_Horizontal	J101, J201
42	SW_SPST	SW_PG1350	SW101, SW102, SW103, SW104, SW105, SW106, SW107, SW108 +34
4	C93155 SW_SPST	SW_PUSH-12mm	SW123, SW124, SW223, SW224
1	VAL**	mouse-bite-3mm-slot	mouse-bite-3mm-slot
1	VAL**	mouse-bite-5mm-slot	mouse-bite-5mm-slot
42	1N4148	D_SOD-323	D102, D103, D104, D105, D106, D107, D108, D110 +34
42	WS2812B_2020	LED_WS2812B-2020_PLCC4_2.0x2.0mm	D126, D127, D128, D129, D130, D131, D132, D135 +34
54	100N 100n	C_0402_1005Metric	C101, C102, C103, C104, C106, C107, C108, C109 +46
5	220N 220n	C_0402_1005Metric	C105, C121, C122, C221, C222
19	4.7K 4.7k	R_0402_1005Metric	R108, R109, R110, R111, R112, R116, R117, R118 +11

Kallisto design files

The KiCad project lives in the Fredrik-Reinholdsen/kallisto repository on GitHub; these links point at the commit this page was built from.

Layoutelectronics/kicad/Akula.kicad_pcb
Schematicelectronics/kicad/Akula.kicad_sch
BOMelectronics/Kalisto_BOM.csv

Kallisto: common questions

What microcontroller does the Kallisto use?

The Kallisto is built around the Pico, from the RP2040/RP2350 family.

How big is the Kallisto PCB?

The Kallisto measures 216.6 × 182 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kallisto?

218 components, from 13 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 Kallisto design files?

From the Fredrik-Reinholdsen/kallisto 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 Kallisto design in my own project?

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

Can I test firmware for the Kallisto 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.