HardLabs

Motherboard bak

Foosa7·koi_8x8·hardware/motherboard/motherboard_bak.kicad_pcb

Motherboard bak PCB layout, top view — open source RP2040/RP2350 board by Foosa7
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About the Motherboard bak PCB

Motherboard bak is an open source RP2040/RP2350 PCB design by Foosa7, published on GitHub. It is a 4-layer board measuring 150 × 90 mm, with 21 components from 9 distinct parts.

Its main chip is the C7203003, from the RP2040/RP2350 family. Other key parts include the SN74HC138PWR, TMUX1208PW and SN74LV595. By type, the board carries 12 connectors, 4 ICs, 3 capacitors and 1 module.

It belongs with the usb & debug tools designs in this gallery.

From the project

The controller board for Koi 8×8. Carries a Raspberry Pi Pico (RP2040) and hosts up to 8 daughterboards in PCIe-x4 card-edge slots, addressing each board's DAC/ADC over a shared SPI bus. Formerly codenamed MOBO. The PC talks to the Pico's firmware over USB serial — see firmware/m

The controller board for Koi 8×8. Carries a Raspberry Pi Pico (RP2040) and hosts up to 8 daughterboards in PCIe-x4 card-edge slots, addressing each board's DAC/ADC over a shared SPI bus. Formerly codenamed MOBO. The PC talks to the Pico's firmware over USB serial — see firmware/motherboard-test/.

Same top view with an alpha background, for dropping onto slides or into the paper's figures:

Motherboard bak, from the project README
From the project README

Main components on the Motherboard bak

SN74HC138PWRTMUX1208PWSN74LV595C7203003

Motherboard bak bill of materials (BOM)

21 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
SN74HC138PWR
74HC138
U1, U5
1
TMUX1208PW
U2
1
SN74LV595
U3
1
C7203003
RaspberryPi_Pico
A1
8
PCIE-064-02-F-D-TH
Custom_PCIe_x4
J1, J2, J3, J4, J5, J6, J7, J8
3
CONN_01X50_MOUNTINGPIN
Conn_01x50_MountingPin
J9, J10, J11
1
BARREL_JACK_SWITCH_PIN3RING
Barrel_Jack_Switch_Pin3Ring
J12
1
DSM2-12-S3-S
PS1
3
0.1UF
0.1uF
C1, C2, C3

Motherboard bak design files

The KiCad project lives in the Foosa7/koi_8x8 repository on GitHub; these links point at the commit this page was built from.

Motherboard bak: common questions

What microcontroller does the Motherboard bak use?

The Motherboard bak is built around the C7203003, from the RP2040/RP2350 family.

How big is the Motherboard bak PCB?

The Motherboard bak measures 150 × 90 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Motherboard bak?

21 components, from 9 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 Motherboard bak design files?

From the Foosa7/koi_8x8 repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Motherboard bak design in my own project?

The repository has no license, so all rights stay with Foosa7. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Motherboard bak 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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