HardLabs

Meridian-W104

charancs926-png·Meridian-W104·PCB/Meridian W104.kicad_pcb

Meridian-W104 PCB layout, top view — open source Nordic nRF board by charancs926-png

About the Meridian-W104 PCB

Meridian-W104 is an open source Nordic nRF PCB design by charancs926-png, published on GitHub. It is a 4-layer board measuring 458.2 × 164 mm, with 250 components from 24 distinct parts.

Its main chip is the XIAO nRF52840, from the Nordic nRF family. Other key parts include the SN74HC595D and SN74HC165D. By type, the board carries 106 switches, 104 diodes, 26 resistors, 5 ICs, 5 capacitors and 3 LEDs.

It belongs with the keyboards, iot & wireless and rf & radio designs in this gallery.

From the project

A Keyboard named Meridian W104

Meridian W104 is my custom full size 104-key wireless mechanical keyboard, built around a Seeed XIAO nRF52840 non-Plus.

so basically i wanted a full size board with a proper number pad that could run over bluetooth, but still use usb-c when needed. the project brings together the key matrix, diodes, serial scan logic, battery connection and a slim rounded case. the hardware is in KiCad and the case source is in Fusion 360, with the files needed to make a first prototype included here.

Main components on the Meridian-W104

XIAO nRF52840SN74HC595DSN74HC165D

Meridian-W104 bill of materials (BOM)

250 components, 24 distinct parts.

QtyPartRefs
1
XIAO nRF52840
U1
1
SN74HC595D
U2
3
SN74HC165D
U3, U4, U5
1
Protected 1S LiPo
J1
86
1u
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +78
2
2u
SW30, SW103
2
1.5u
SW31, SW44
1
1.75u
SW45
2
2.25u
SW57, SW58
1
2.75u
SW69
7
1.25u
SW70, SW71, SW72, SW74, SW75, SW76, SW77
1
6.25u
SW73
2
1u
SW101, SW102
1
BATTERY ON / OFF
SW105
1
USB / BLE toggle
SW106
1
CAPS
LED1
1
NUM
LED2
1
SCROLL
LED3
104
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +96
1
10u / 10V
C1
Show 4 more
QtyPartRefs
4
100n
C2, C3, C4, C5
22
22k
R1, R2, R3, R4, R5, R6, R7, R8 +14
3
1k
R23, R24, R25
1
100k / OE off
R26

Meridian-W104 design files

The KiCad project lives in the charancs926-png/Meridian-W104 repository on GitHub; these links point at the commit this page was built from.

Meridian-W104: common questions

What microcontroller does the Meridian-W104 use?

The Meridian-W104 is built around the XIAO nRF52840, from the Nordic nRF family.

How big is the Meridian-W104 PCB?

The Meridian-W104 measures 458.2 × 164 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Meridian-W104?

250 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the Meridian-W104 design files?

From the charancs926-png/Meridian-W104 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Meridian-W104 design in my own project?

The repository has no license, so all rights stay with charancs926-png. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Meridian-W104 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.

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