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A7s backplane.bak

skitzo2000·cyberdecks·backplane/kicad/a7s_backplane.bak.kicad_pcb

A7s backplane.bak PCB layout, top view — open source RP2040/RP2350 board by skitzo2000

About the A7s backplane.bak PCB

A7s backplane.bak is an open source RP2040/RP2350 PCB design by skitzo2000, published on GitHub. It is a 2-layer board measuring 86.2 × 74.1 mm, with 20 components from 13 distinct parts.

Its main chip is the RP2040-ZERO, from the RP2040/RP2350 family. By type, the board carries 11 connectors, 4 switches, 2 fuses, 2 capacitors and 1 module.

It belongs with the rf & radio, displays & leds and dev boards & breakouts designs in this gallery.

From the project

Cyberdeck component research — 2026 buyer's guides for compute, displays, input, power, networking/radio, and chassis.

A hand-solderable backplane shield for the Radxa Cubie A7S (Allwinner A733). It fans the A7S's 45 header pins out into a cyberdeck I/O board: dual swappable radios, an input MCU, a touchscreen, and a Flipper-compatible expansion header.

The earlier boards (archived in v1/) mated the A7S GPIO headers mirrored — the shield's socket pin 1 landed where the A7S's pin 30 is. That put the A7S +3V3 rail onto the shield's GND, so the SBC dead-shorted and went dark the instant the shield was seated. v2 corrects it:

Main components on the A7s backplane.bak

RP2040-ZERO

A7s backplane.bak bill of materials (BOM)

20 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
RP2040-ZERO
RP2040-Zero
A1
1
CONN_02X15_ODD_EVEN
Conn_02x15_Odd_Even
J1
1
CONN_01X15
Conn_01x15
J2
1
CONN_01X14
Conn_01x14
J3
2
CONN_02X04_ODD_EVEN
Conn_02x04_Odd_Even
J5, J6
2
Conn_01x01
J5b, J6b
1
JOY
J8
1
ENC
J10
1
BTN5_6
J11
1
FLIPPER
J12
2
MF-R050 0.5A
F1, F2
4
SW_Push
SW1, SW2, SW3, SW4
2
0.1UF
0.1uF
C1, C2

A7s backplane.bak design files

The KiCad project lives in the skitzo2000/cyberdecks repository on GitHub; these links point at the commit this page was built from.

A7s backplane.bak: common questions

What microcontroller does the A7s backplane.bak use?

The A7s backplane.bak is built around the RP2040-ZERO, from the RP2040/RP2350 family.

How big is the A7s backplane.bak PCB?

The A7s backplane.bak measures 86.2 × 74.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the A7s backplane.bak?

20 components, from 13 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 A7s backplane.bak design files?

From the skitzo2000/cyberdecks repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the A7s backplane.bak design in my own project?

The repository has no license, so all rights stay with skitzo2000. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the A7s backplane.bak 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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