Small fry

About the Small fry PCB

Small fry is an open source RP2040/RP2350 PCB design by anchovie-codes, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 365 × 103 mm, with 139 components from 6 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. By type, the board carries 69 LEDs, 69 diodes and 1 IC.

It belongs with the keyboards designs in this gallery.

From the project

a not-so-small keyboard with a fishy layout

- 1x Raspberry Pi Pico (make sure you get an authentic one with the castellated pins) - 69x SOD123 diodes (e.g. 1N4148W) - 69 MX or Alps switches (i strongly recommend MX unless you are confident in fabricating your own keycaps) - 2x 2U stabilizers - 53x 1U keycaps - 14x 1.75U keycaps - 1x 2.25U keycap - 1x 2.75U keycap

- a heat gun + solder paste are highly recommended for soldering the diodes, however they can be hand-soldered if you are patient and skilled. - soldering iron + solder wire for soldering the switches and MCU.

Small fry, from the project README — From the project README

Main components on the Small fry

Pico

Small fry bill of materials (BOM)

139 components, 6 distinct parts.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
14	MX-NoLED	MX-1.75U-NoLED	MX1, MX2, MX15, MX16, MX17, MX30, MX31, MX32 +6
53	MX-NoLED	MX-1U-NoLED	MX3, MX4, MX5, MX6, MX7, MX8, MX9, MX10 +45
1	MX-NoLED	MX-2.25U-ReversedStabilizers-NoLED	MX62
1	MX-NoLED	MX-2.75U-ReversedStabilizers-NoLED	MX63
69	D_Small	D_SOD-123	D1, D2, D3, D4, D5, D6, D7, D8 +61

Small fry design files

The KiCad project lives in the anchovie-codes/small-fry repository on GitHub; these links point at the commit this page was built from.

Layoutsmall-fry-pcb.kicad_pcb
Schematicsmall-fry-pcb.kicad_sch

Small fry: common questions

What microcontroller does the Small fry use?

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

How big is the Small fry PCB?

The Small fry measures 365 × 103 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Small fry?

139 components, from 6 distinct parts. The full bill of materials is listed on this page.

Where can I download the Small fry design files?

From the anchovie-codes/small-fry repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Small fry design in my own project?

Yes, under the terms of its CC0-1.0 license, which anchovie-codes chose for the repository.

Can I test firmware for the Small fry 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.