HardLabs

Io

MichaelBell·RV4028·io/io.kicad_pcb

Io PCB layout, top view — open source RP2040/RP2350 board by MichaelBell

About the Io PCB

Io is an open source RP2040/RP2350 PCB design by MichaelBell, published on GitHub under the BSD-3-Clause license. It is a 4-layer board measuring 84 × 40 mm, with 48 components from 24 distinct parts.

Its main chip is the RP2350_80QFN, from the RP2040/RP2350 family. Other key parts include the 74LVC32 and W25Q32JVS. By type, the board carries 19 capacitors, 12 resistors, 6 connectors, 3 ICs, 3 diodes and 2 switches.

From the project

RV4028 - A hackable Risc-V computer

Basic idea is to expose the RP2350's hardware blocks as memory mapped peripherals.

Peripherals: - 2 UARTs (one to backplane, one on headers) - 2 I2C (QwST connectors) - 1 SPI with 3 or 4 chip selects (can be used for programming the FPGA) - SD card - Maybe a WS2812 interface (exposing 5V power) - Further pins as general purpose IO. Maybe could expose a PIO block?

Main components on the Io

RP2350_80QFN74LVC32W25Q32JVS

Io bill of materials (BOM)

48 components, 24 distinct parts.

QtyPartRefs
1
RP2350_80QFN
U1
1
74LVC32
U2
1
W25Q32JVS
U3
1
ABM8-272-T3
Y1
1
~
J1
1
Conn_02x03
J2
2
QwST
J3, J5
1
SM03B-SRSS-TB
J4
1
Conn_02x08_Odd_Even
J6
1
TF-15×15
Card1
2
SW_Push
SW1, SW2
1
KT-0603R
D1
1
WS2812B
D2
1
1N4148W
D3
1
3.3u
L1
12
100n
C2, C8, C11, C12, C13, C14, C15, C16 +4
2
15p
C3, C4
2
4.7u
C6, C7
2
4.7u
C9, C10
1
10u
C19
Show 4 more
QtyPartRefs
4
1k
R1, R2, R4, R6
2
33
R3, R5
2
27
R7, R8
4
10k
R9, R10, R11, R12

Io design files

The KiCad project lives in the MichaelBell/RV4028 repository on GitHub; these links point at the commit this page was built from.

Io: common questions

What microcontroller does the Io use?

The Io is built around the RP2350_80QFN, from the RP2040/RP2350 family.

How big is the Io PCB?

The Io measures 84 × 40 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Io?

48 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Io design files?

From the MichaelBell/RV4028 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Io design in my own project?

Yes, under the terms of its BSD-3-Clause license, which MichaelBell chose for the repository.

Can I test firmware for the Io 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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