Probe
MichaelBell·RV4028·probe/probe.kicad_pcb
About the Probe PCB
Probe is an open source PCB design by MichaelBell, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 16 × 84 mm, with 3 components from 2 distinct parts.
From the project
RV4028 - A hackable Risc-V computer
RV4028 is intended to be a modular Risc-V computer, similar to the excellent RC2014 Z80 homebrew computer.
The idea is to create a minimal Risc-V system that is easy to understand and extend.
The inspiration for this came from @theJPster's post.
All hardware and software are open source and permissively licensed.
The system bus has a 32-bit address and 16-bit data, which fits reasonably well with an RV32 system and readily available (P)SRAM chips, and runs at 3.3V.

Probe bill of materials (BOM)
3 components, 2 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_02x40_Top_Bottom | PinSocket_2x40_P2.00mm_Vertical | J1 |
| 2 | Conn_01x40 | PinHeader_1x40_P2.00mm_Vertical | J2, J3 |
Probe design files
The KiCad project lives in the MichaelBell/RV4028 repository on GitHub; these links point at the commit this page was built from.
- Layoutprobe/probe.kicad_pcb
- Schematicprobe/probe.kicad_sch
Probe: common questions
How big is the Probe PCB?
The Probe measures 16 × 84 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Probe?
3 components, from 2 distinct parts. The full bill of materials is listed on this page.
Where can I download the Probe 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 Probe design in my own project?
Yes, under the terms of its BSD-3-Clause license, which MichaelBell chose for the repository.