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Rana Tadpole

rana-sylvatica·rana-tadpole·PCBs/Motherboard/KiCAD files/Rana Tadpole PCB.kicad_pcb

Rana Tadpole PCB layout, top view — open source RP2040/RP2350 board by rana-sylvatica

About the Rana Tadpole PCB

Rana Tadpole is an open source RP2040/RP2350 PCB design by rana-sylvatica, published on GitHub. It is a 2-layer board measuring 172 × 107 mm, with 53 components from 19 distinct parts.

Its main chip is the C2040, from the RP2040/RP2350 family. Other key parts include the C5446, C519263 and C97521. By type, the board carries 21 switches, 17 capacitors, 8 resistors, 4 ICs, 2 diodes and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Pocket-sized digital controller

The Rana Tadpole is a pocket-sized 20-button digital controller, designed for platform fighters but usable for other fighting games, platformers, etc.

Unlike most other similar controller designs that use either keyboard switches or arcade buttons, the Tadpole uses mouse switches (Kailh GM 4.0 if using the provided BOM files - there are other compatible switches that can be subsituted as well at the builders discretion).

Rana Tadpole, from the project README
From the project README

Main components on the Rana Tadpole

C5446C519263C2040C97521

Rana Tadpole bill of materials (BOM)

53 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
C5446
XC6206
U1
1
C519263
X05A26H12G
U2
1
C2040
RP2040
U3
1
C97521
W25Q128JVS
U4
1
C9002
12MHz
Y1
1
C202424
Boot
SW1
20
C400254
~
SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 +12
1
C8598
Schottky Diode
D1
1
C84256
GREEN
D3
4
C52923
1uF
C1, C2, C4, C10
10
C1525
100nF
C3, C5, C6, C11, C12, C13, C14, C15 +2
2
C1555
22pF
C7, C8
1
C15525
10uF
C9
1
C25117
470
R4
1
C23189
5.6k
R5
1
C25804
10k
R6
1
C25744
10k
R7
2
C25190
27
R8, R9
2
C11702
1k
R10, R11

Rana Tadpole design files

The KiCad project lives in the rana-sylvatica/rana-tadpole repository on GitHub; these links point at the commit this page was built from.

Rana Tadpole: common questions

What microcontroller does the Rana Tadpole use?

The Rana Tadpole is built around the C2040, from the RP2040/RP2350 family.

How big is the Rana Tadpole PCB?

The Rana Tadpole measures 172 × 107 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rana Tadpole?

53 components, from 19 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 Rana Tadpole design files?

From the rana-sylvatica/rana-tadpole 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 Rana Tadpole design in my own project?

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

Can I test firmware for the Rana Tadpole 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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