HardLabs

Motherboard

Foosa7·koi_8x8·hardware/motherboard/motherboard.kicad_pcb

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

Motherboard is an open source RP2040/RP2350 PCB design by Foosa7, published on GitHub. It is a 4-layer board measuring 150 × 90 mm, with 48 components from 27 distinct parts.

Its main chip is the C7203003, from the RP2040/RP2350 family. Other key parts include the SN74HC138PWR, TMUX1208PW, SN74LV595, LP5912-3.3DRV and K7805-500R3. By type, the board carries 13 connectors, 10 capacitors, 10 resistors, 6 ICs, 6 diodes 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, from the project README
From the project README

Main components on the Motherboard

SN74HC138PWRTMUX1208PWSN74LV595LP5912-3.3DRVK7805-500R3C7203003

Motherboard bill of materials (BOM)

48 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
SN74HC138PWR
U1, U5
1
TMUX1208PW
U2
1
SN74LV595
U3
1
LP5912-3.3DRV
U4
1
K7805-500R3
U6
1
C7203003
RaspberryPi_Pico
A1
1
AO3407A
Q1
8
PCIE-064-02-F-D-TH
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
CONN_01X02_PIN
Conn_01x02_Pin
J13
1
1812L150/24MR
F1
1
SS34
D1
1
SMBJ16A
D2
3
LED
D3, D4, D5
1
BZT52C18
D6
5
0.1UF
0.1uF
C1, C2, C3, C4, C10
1
10UF
10uF
C5
1
22UF
22uF
C6
1
220UF
220uF
C7
Show 7 more
QtyPartRefs
2
10UF
10uF
C8, C9
3
100K
100k
R1, R5, R6
2
4.7K
4.7k
R2, R8
1
1.5K
1.5k
R3
1
680
R4
2
10K
10k
R7, R9
1
22K
22k
R10

Motherboard 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: common questions

What microcontroller does the Motherboard use?

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

How big is the Motherboard PCB?

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

How many components are on the Motherboard?

48 components, from 27 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 design files?

From the Foosa7/koi_8x8 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 Motherboard 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 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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