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Skinny Chameleon

TweetyDaBird·Skinny-Chameleon·PCB/v1.20/Skinny Chameleon.kicad_pcb

Skinny Chameleon PCB layout, top view — open source RP2040/RP2350 board by TweetyDaBird

About the Skinny Chameleon PCB

Skinny Chameleon is an open source RP2040/RP2350 PCB design by TweetyDaBird, published on GitHub. It is a 2-layer board measuring 225.5 × 93 mm, with 180 components from 22 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the SPX3819M5-L-3-3, W25Q32JVUUIQ, SN74LV1T34DBV and SRV05-4. By type, the board carries 62 switches, 60 diodes, 23 capacitors, 8 resistors, 5 ICs and 2 inductors.

It belongs with the keyboards designs in this gallery.

From the project

The Skinny Chameleon is a grid type orthogonal keyboard made to be a direct drop-in for the Preonic's and Planck's PCB's.

Using the non-standard 19.00 mm grid spacing this PCB fit's all original cases for Preonic & Planck, and should fit all the various 'aftermarket' keyboard cases intended for these PCB's as well.

Being fully hot-swap and with PCB mounted stabilizers, Chameleon adds support for up to four encoders and a bottom row allowing either a single stabilized 2u key or two 2u keys in the middle, allowing for a layout that suits most users. If used as a 5 row keyboard, the bottom encoders can alternatively be placed at the edges on the second row, but not more than one per corner.

Skinny Chameleon, from the project README
From the project README

Main components on the Skinny Chameleon

SPX3819M5-L-3-3W25Q32JVUUIQRP2040SN74LV1T34DBVSRV05-4

Skinny Chameleon bill of materials (BOM)

180 components, 22 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
SPX3819M5-L-3-3
SPX3819M5-L-3-3/TR
U1
1
W25Q32JVUUIQ
U2
1
RP2040
U3
1
SN74LV1T34DBV
U4
1
SRV05-4
U5
1
TXM12M0004252LBCEO00T
Y1
2
RotaryEncoder_Switch
ENC1, ENC2
4
RotaryEncoder_Switch
ENC3, ENC4, ENC5, ENC6
1
0603L050/6AR
F1
11
Spacer_PCB
H1, H2, H4, H5, H6, H7, H9, H11 +3
60
PG151101S11
SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 +52
2
YTSA010
SW67, SW68
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
USB1
60
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +52
2
BLM18SG700TZ1D
FB1, FB2
4
1UF
1uF
C1, C8, C11, C12
17
100NF
100nF
C2, C3, C4, C5, C6, C7, C9, C10 +9
2
30PF
30pF
C14, C15
2
5.1K
R1, R2
2
10K
R3, R7
Show 2 more
QtyPartRefs
2
1K
R4, R10
2
27R
R5, R6

Skinny Chameleon design files

The KiCad project lives in the TweetyDaBird/Skinny-Chameleon repository on GitHub; these links point at the commit this page was built from.

Skinny Chameleon: common questions

What microcontroller does the Skinny Chameleon use?

The Skinny Chameleon is built around the RP2040, from the RP2040/RP2350 family.

How big is the Skinny Chameleon PCB?

The Skinny Chameleon measures 225.5 × 93 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Skinny Chameleon?

180 components, from 22 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 Skinny Chameleon design files?

From the TweetyDaBird/Skinny-Chameleon 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 Skinny Chameleon design in my own project?

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

Can I test firmware for the Skinny Chameleon 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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